Most Download articles

    Published in last 1 year | In last 2 years| In last 3 years| All| Most Downloaded in Recent Month | Most Downloaded in Recent Year|

    In last 3 years
    Please wait a minute...
    For Selected: Toggle Thumbnails
    Spatio-temporal pattern of cropland abandonment in China from 1992 to 2017: A Meta-analysis
    Xuezhen ZHANG, Caishan ZHAO, Jinwei DONG, Quansheng GE
    Acta Geographica Sinica    2019, 74 (3): 411-420.   DOI: 10.11821/dlxb201903001
    Abstract5346)   HTML709)    PDF (2529KB)(3986)      

    Cropland abandonment has increasingly occurred in China, which potentially affects national food and ecological security. This study collected existing publications focusing on cropland abandonment. Then, we extracted the key characteristics of cropland abandonment events, including time, location, magnitude, and driving force. The meta-analysis was carried out on these items to disclose the spatio-temporal pattern and main drivers of cropland abandonment in China in the last three decades. We found that there were a total of 163 counties in which cropland abandonment occurred according to the existing literature. These counties were mostly located in southern China and, in particular, exhibited a pattern of a T-shape on 90 degree anticlockwise rotation. The vertical axis exhibited a north-south belt across southeastern Gansu Province, eastern Sichuan Province, Chongqing, western Guizhou Province, and northern Yunnan Province. The horizontal axis exhibited a west-east belt along the middle to lower reaches of the Yangtze River across southern Hubei Province, northern Hunan Province,w and central to southern Anhui Province. In the provinces of Hunan, Sichuan, and Anhui, cropland abandonment can be found in 24, 23, and 21 counties, respectively; in Hubei, Chongqing, Fujian, Gansu, and Yunnan provincial-level areas, there are more than 10 counties with cropland abandonment. The formation of the “T” structure underwent two stages. Before 2010, there were 102 counties with cropland abandonment that mainly existed along the middle to lower reaches of the Yangtze River, where the horizontal axis occurred. Since 2010, there have been 63 counties with cropland abandonment, mostly existing in the north-south belt from southeastern Gansu to northern Guizhou, where the vertical axis occurred. The spatio-temporal patterns of cropland abandonment events matched well with the labor emigration from agriculture in the context of regional economic development and industrial restructuring. The low economic efficiency of agriculture and the shortage of agricultural labor are two common drivers leading to cropland abandonment in 86% and 78% of counties, respectively.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(9)
    Does the Rocky Desertification Control Project promote county economic development? An empirical analysis based on DID methods using 88 counties' panel data of Guangxi
    Juan PANG, Ruiping RAN
    Resources Science    2019, 41 (1): 196-206.   DOI: 10.18402/resci.2019.01.18
    Abstract593)   HTML38)    PDF (2976KB)(3552)      

    The Rocky Desertification Control Project (RDCP) has become a major ecological restoration and livelihood project in the karst areas of Southwest China, which could prevent soil erosion, restore ecological environment, promote social and economic development, and improve household's livelihood. The impact of the RDCP is a major issue worthy of attention. This study theoretically analyzed the influencing mechanism of the RDCP on the development of County economic and evaluated the RDCP's economic impact based on panel data collected from 88 counties of Guangxi province from 2006 to 2016, using the Difference-in-Difference (DID) method. We first estimated the average impact of the RDCP on county economic development. Then we evaluated the dynamic impact of the RDCP, using the panel fixed effect model. The results illustrate that RDCP has a sustainably positive and statistically significant impact on the county economic development. Regardless of whether other variables are controlled, the economic development level of the treat group is significantly higher than that of the control group. Furthermore, the longer the RDCP is implemented, the greater the impact is. It means that with the help of various favorable policy measures for the RDCP, the rocky desertification areas can continuously accumulate favorable factors for economic development and form a “cyclical accumulation. ” With conducting the robustness test, we found that the results of the empirical analysis are reliable. The DID method can indeed give a reasonable estimate of the causal effects of the RDCP and county economic development. The results confirm the positive impact of the first phase of RDCP on the economic development. RDCP will have an important policy implication for the second phase of the RDCP and the establishment of relevant policies.

    Table and Figures | Reference | Related Articles | Metrics
    Evaluation of urban resilience of Dalian city based on the perspective of "Size-Density-Morphology"
    XIU Chunliang,WEI Ye,WANG Qi
    Acta Geographica Sinica    2018, 73 (12): 2315-2328.   DOI: 10.11821/dlxb201812004
    Abstract1307)   HTML50)    PDF (1903KB)(3302)      

    Aiming at building a safe city, this study proposed a “Size-Density-Morphology” based three-dimensional urban resilience evaluation framework according to the theories and methods of geography and landscape ecology. By using the framework, the urban resilience of each county in Dalian city during 2000-2016 was evaluated. There are three kinds of urban resilience, namely size resilience, density resilience and morphology resilience. The size resilience could be measured by ecological infrastructure tools; the density resilience could be measured by ecological footprint and ecological carrying capacity; the morphology resilience could be measured by "Source-sink" landscape average distance index. In addition, this paper also analyzed the combining forms of the three types of resilience. This study demonstrates that the three-dimension evaluation framework has a unique capacity to identify the resilience characteristics of city, and it is a key bond which creates the connection of urban planning and urban resilience research. Findings are as follows: (1) The size safety is the primary constraint condition for urban spatial expansion. (2) Ecological carrying capacity is the safe threshold for urban density. (3) The spatial coupling of source and sink landscape is a basic feature of good urban morphology. (4) It is the combination of size-density-morphology resilience to determine the safety of the city rather than each single one. According to the analysis of combination characteristics of the "Size-Density-Morphology" resilience, four suggestions were put forward for the development of Dalian city in future. (1) Strictly limit the development intensity of central urban area and Jinzhou district to curb the urban sprawl trend; (2) Strictly control the development of the coastal zone and maintain the integrity of natural mountain and green vegetation patches; (3) Promote the balanced development on a whole city scale to improve the city's overall resilience; (4) Optimizing the development strategy of new urban area in order to form a good urban morphology.

    Reference | Related Articles | Metrics
    Cited: CSCD(5)
    Evolution of transportation in China since reform and opening-up: Patterns and principles
    JIN Fengjun, CHEN Zhuo
    Acta Geographica Sinica    2019, 74 (10): 1941-1961.   DOI: 10.11821/dlxb201910001
    Abstract3277)   HTML391)    PDF (9943KB)(2448)      

    Since the reform and opening-up in 1978, historic changes have been seen in the transportation geography pattern of China. Understanding its evolutionary characteristics and regularity is significant and meaningful for future transportation construction and territory development. This paper reviewed the process of transportation construction in China and investigated the evolutionary characteristics and spatial effects of transportation geography pattern with the technologies in big data mining and GIS. In addition, the regular rules of transportation geography evolution from the aspects of stages, structures, and orders are systematically analyzed. The investigation showed that China's transportation construction has entered the stage of quality improvement. The construction mode has upgraded from scale-expanding driven by investment to quality-improving driven by innovation. The development direction has changed from "prior development" to "integrated coordinated development". The rapid growth and development of transportation networks have significantly influenced the relationship between time and space. The resulting spatial convergence and superiority pattern are coupled with economic-social distribution, which facilitates the development of the economic-social spatial structure. Consequently, territory development that is traditionally centralized by corridors has changed into the networked mode centered on metropolises and metropolitan areas. In brief, the transportation geography pattern is of evolutionary principles. China has been evolving from the stage of ordered structure to the stage of cascade-order structure. Simultaneously, the economic-social pattern has changed from the axis structure to the hub-and-spoke structure with a preliminary ordered network. As transportation networks grow and expand, China's functional spatial structure and ordered network will be gradually stabilized and balanced.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(1)
    Land consolidation and rural vitalization
    LONG Hualou,ZHANG Yingnan,TU Shuangshuang
    Acta Geographica Sinica    2018, 73 (10): 1837-1849.   DOI: 10.11821/dlxb201810002
    Abstract2761)   HTML78)    PDF (1700KB)(2374)      

    The core objective of rural vitalization is to systemically establish a coupling pattern of various rural development elements including population, land and industry. As one of the prerequisites, land resources is required to be optimally allocated via land consolidation. Consequently, land consolidation contributes greatly in population agglomeration, industry development and resources support under the context of combating rural decline. In light of these facts, this paper conducts an elementary analysis on the connotation of land consolidation and rural vitalization in the new era, as well as their relationships. Furthermore, the issues on the alternative paths for achieving rural vitalization via land consolidation in different regions were also discussed. Main conclusions are drawn as follows: (1) It is manifested that rural vitalization in the new era can be explained as a comprehensive process of tackling the loss and decline of rural development elements through political, economic and cultural means. Most importantly, vitalizing the interior motivation and absorbing the external power are essential for the efficient reconfiguration and utilization of rural population, land and industry, thus achieving the goals of arousing rural vitality, optimizing elements structure, enhancing territorial function and restructuring rural morphology. (2) From the perspective of rural vitalization, land consolidation, which adheres to the path of connotative development, should not only target at stimulating the key elements of rural development, but also place emphasis on the coordination of material space and spirit core, so as to realize the co-prosperity of the urban and the rural areas. (3) Regional natural indigenous factors and the corresponding phases of socio-economic development should be both taken into account in the process of implementing rural land consolidation. Following the principle of adjusting measures to local conditions, appropriate paths or modes are supposed to be chosen in different regions constrained by the territorial development pattern. Finally, focusing on a series of problems and new concepts, which is aimed at achieving urban-rural integration development and boosting socio-economic growth in rural areas, we propose further discussions.

    Reference | Related Articles | Metrics
    Cited: CSCD(43)
    Conservation of the Yangtza River and sustainable development of the Yangtze River Economic Belt:An understanding of General Secretary Xi Jinping's important instructions and suggestions for their implementation
    LU Dadao
    Acta Geographica Sinica    2018, 73 (10): 1829-1836.   DOI: 10.11821/dlxb201810001
    Abstract2254)   HTML40)    PDF (1435KB)(2335)      

    The "T" structures in China's territorial development and economic layout remain to be the two areas with the greatest potential for economic growth in China. This paper, by preliminarily expounding the strategic position of the Yangtze River Economic Belt and the significance of implementing General Secretary Xi Jinping's instruction of "promoting well-coordinated environmental conservation and avoiding excessive development", pointed out that this economic belt failed to recognize the importance of conservation despite of its rapid economic growth during the past two decades. The author believed that the key to conscientiously implementing President Xi's instruction of "promoting well-coordinated environmental conservation and avoiding excessive development" lies in the word "well-coordinated", which highlights the importance of joint efforts. Several main areas in which all regions and sectors should take long-term concrete coordinated actions were then put forward.

    Reference | Related Articles | Metrics
    Cited: CSCD(9)
    Establishment and application of one map of current situation of territorial spatial planning according to the foundations of natural resources: Taking Qingdao city as an example
    HAN Qing, SUN Zhong-yuan, SUN Cheng-miao, LI Dan, LIU Yi-ping
    JOURNAL OF NATURAL RESOURCES    2019, 34 (10): 2150-2162.   DOI: 10.31497/zrzyxb.20191011
    Abstract555)   HTML34)    PDF (4151KB)(2300)      

    The construction of the territorial spatial planning system has been fully carried out. The clear and detailed status map and data are an important basis for understanding the natural resources, and also an important support for the preparation of territorial spatial planning. However, the current land classification standards, data accuracy and application targets of the current territorial spatial data are not uniform. Based on remote sensing images, geographic conditions and Internet POI data, this paper studies one map of land and space status, synthesizes existing land classification standards and data accuracy, and constructs one map of territorial spatial planning status of Qingdao city. On this basis, the application direction of one map of territorial spatial planning is discussed, including the preliminary delimitation of "Production-Living-Ecological Space" in Qingdao city. The suitability of urban construction, the importance of ecological service function and the suitability of agricultural production were analyzed. The construction of one map of the status of territorial spatial planning plays an important role in defining the resource utilization cap and the environmental quality bottom line, standardizing the territorial spatial planning data, and supporting the preparation and management of territorial spatial planning.

    Table and Figures | Reference | Related Articles | Metrics
    Exploration on the theoretical basis and evaluation plan of Beautiful China construction
    Chuanglin FANG, Zhenbo WANG, Haimeng LIU
    Acta Geographica Sinica    2019, 74 (4): 619-632.   DOI: 10.11821/dlxb201904001
    Abstract2680)   HTML333)    PDF (5913KB)(2236)      

    Beautiful China construction (BCC) is of fundamental importance for the sustainable development of the Chinese nation and a Chinese practice of the 2030 UN sustainable development agenda. The Chinese government has made strategic arrangements for the BCC with a five-pronged approach. President Xi Jinping proposed the schedule and roadmap for the BCC at the National Ecological Environmental Protection Conference. But at present, the theoretical basis, evaluation index system, evaluation criteria and construction effect of the BCC are not clear. This paper puts forward the basic connotation of the BCC from a broad and narrow perspective, regards the theory of man-earth harmony and Five-dimensional integration as the core theoretical basis of the BCC, and further constructs the evaluation index system of the BCC, which includes five dimensions: ecological environment, green development, social harmony, institutional improvement and cultural heritage, and uses the United Nations human development index (HDI) evaluation method to scientifically evaluate the construction effect of 341 prefecture-level cities (states) in China in 2016. The results show that the average value of the BCC Index (Zhongke Beauty Index) is 0.28, which is generally at a low level. The average of the sub-indexes of the ecological environment beauty index, the green development beauty index, the social harmony beauty index, the system perfect beauty index and the cultural heritage beauty index are respectively 0.6, 0.22, 0.29, 0.22, and 0.07. The sub-index values are all low, and the regional development is quite different, which indicates that the construction process of Beautiful China is generally slow and unbalanced. In order to implement the schedule and roadmap for the BCC with high quality and high standards, it is recommended that we construct and publish a general evaluation system for the BCC process, carry out dynamic monitoring and phased comprehensive evaluation of the BCC process, compile and publish the evaluation standards for BCC technology, do a good job in the comprehensive zoning of Beautiful China, carry out pilot projects for the construction of Beautiful China's model areas according to local conditions, and incorporate the achievements of Beautiful China into the assessment indicators of all levels of government.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(12)
    Development and management tasks of the Yellow River Basin: A preliminary understanding and suggestion
    LU Dadao, SUN Dongqi
    Acta Geographica Sinica    2019, 74 (12): 2431-2436.   DOI: 10.11821/dlxb201912001
    Abstract4045)   HTML377)    PDF (828KB)(2235)      

    The Yellow River Basin and the areas along the Yellow River play an important strategic role in national development. Xi Jinping, General Secretary of the CPC, delivered an important speech at the symposium on ecological protection and high-quality development of the Yellow River Basin in Zhengzhou, which is of great strategic significance. This paper gives a preliminary understanding of the comprehensive governance and the sustainable development of the Yellow River Basin. It points out that the task of the comprehensive and profound transformation and development of the Yellow River Basin in the new era is still arduous, and change of concept is required. Continuing to promote the clean and efficient use of energy, promoting industrial development in accordance with local conditions, preventing extensive development and protecting cultivated land resources should be regarded as important measures to strengthen the comprehensive management and guarantee the sustainable development of the Yellow River Basin. It is believed that the "Yellow River Economic Belt" does not exist at the national economic level, and it is not appropriate to identify "the Yellow River Delta" as a national strategy.

    Reference | Related Articles | Metrics
    Cited: CSCD(13)
    Ecological risk assessment based on terrestrial ecosystem services in China
    Feng CHEN, Hongbo LI, Anlu ZHANG
    Acta Geographica Sinica    2019, 74 (3): 432-445.   DOI: 10.11821/dlxb201903003
    Abstract3243)   HTML366)    PDF (1928KB)(2222)      

    The ecological risk assessment was previously explored according to ecological entity characteristics, such as point source threat and regional landscape pattern change, and ignored the factors related to the human well-being. The academic contribution of the essay is to integrate ecosystem services into assessment system of ecological risk in a new perspective. In this paper, the spatial mapping of ecosystem services on China's land is reconstructed with the aid of GIS and RS. Moreover, the ecological risk analysis model is established in order to quantitatively expound the spatial pattern of the ecological risk based on ecosystem services, and identify ecological risk control priority regions at different confidence levels. The results showed that: (1) From 2000 to 2010, the average annual value of total terrestrial ecosystem services index in China was between 0-2.17, and slightly fluctuated between 0.30-0.57 over the years. Some 24.7% of the regions with significantly increasing value included Taiwan, Yunnan-Guizhou Plateau, inland Xinjiang of northwest China, 37.1% of the regions with significantly decreasing value, including northeast China, Qinghai-Tibet Plateau, central and eastern regions of China; (2) The risk losses of ecosystem services were exposed to different situations under different confidence levels. When the confidence level was 90%, the potential loss ratio of the total ecosystem services index was 24.19%, and the ecological risk index was 0.253. Furthermore, by analyzing the relationship between confidence level and ecological risk index, when the confidence level was high, the probability of risk was reduced correspondingly, but the losses correspondingly increased when risk occurred; (3) We investigated the scenario as an example under the 90% confidence level. The different eco-regions with the risk characteristics are as follows: the top six eco-regions with average ecosystem services risk index are Inner Mongolia Plateau, North China Plain, Loess Plateau, Northeast China Plain, Hengduan Mountain Region, and Qinghai-Tibet Plateau. The proportions of the eco-regions with extreme risk are 55.89%, 26.63%, 24.35%, 20.62%, 18.70% and 25.12%, respectively.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(5)
    Research progress of urban public recreational space in China
    YU Ling,LIU Jiaming,LI Tao,ZHU He
    Acta Geographica Sinica    2018, 73 (10): 1923-1941.   DOI: 10.11821/dlxb201810008
    Abstract1279)   HTML19)    PDF (2391KB)(2153)      

    As the main places for urban residents' recreation activity in the era of mass leisure, urban public recreational space (UPRS) is one of the major components of urban public spatial system. Its planning, layout, and the service are the main characters to measure the urban social civilization and the life quality of residents. Meanwhile, in order to meet the current demands for the construction of livable cities and meet the challenges of UPRS development in the process of urbanization, it is important to have a scientific and systematic review on the latest development of UPRS research for promoting the development of this subject. Based on a data from the China National Knowledge Internet during 1985 to 2017, this study examined and summarized the research development of UPRS in China. By using literature quantitative analysis, we divided the China's UPRS related research into three stages of development based on the number and growth rate of papers per year, namely starting period (1985-2000), growth period (2001-2009), and consolidation period (2010-2017). Then, this paper identified nine hot research topics in the UPRS and reviewed their progresses in research by using a knowledge network of UPRS built on the co-occurrence of keywords. These topics include the classifications of UPRS, spatial structure and layout, comprehensive assessment, planning and development strategies, impacts induced by UPRS development, evolution characteristics and their driving mechanism, space imagery features, sustainable utilization, and so on. Moreover, this paper systematically reviewed the research methods and the scale of the China's UPRS related studies. Finally, in response to problems and deficiencies of extant research, this paper put forward some suggestions regarding future research. Chinese UPRS studies should pay more attention to the basic theoretical research. We should construct a new research system with Chinese characteristics based on interdisciplinary and multi-level spatial integration research. Besides, we should develop the humanism philosophy and construct management systems for UPRS that can lead the development of world cities based on the global vision.

    Reference | Related Articles | Metrics
    Geographical synergetics: From understanding human-environmentrelationship to designing human-environment synergy
    SHI Peijun,SONG Changqing,CHENG Changxiu
    Acta Geographica Sinica    2019, 74 (1): 3-15.   DOI: 10.11821/dlxb201901001
    Abstract1597)   HTML104)    PDF (3035KB)(2120)      

    From the perspective of achieving sustainable development in the world and building a community with a shared future for humankind in the "Anthropocene", and considering the complexity of the Earth's surface system, various disasters facing humanity, and future challenges of resource shortages and environmental risks, we proposed the development of "geographical synergy"—the mechanism, process and dynamics of the Earth's surface system and regional sustainability—in order to realize the transformation of geographical research from the explanation of human-environment relationship to the design of human-environment synergy. We discussed the scientific and technological questions of modern geography from the perspectives of integrating natural and social units, natural resources and natural disasters, achievements and faults of humans, and coupling of dynamic and non-dynamic processes and systems. We proposed the metrics of "consilience degree" as a measure of the complexity of integrated disaster reduction system based on the understanding of disaster system and the mechanism, process and dynamics of hazard and disaster formation. Using the principles of synergetic tolerance, synergetic constraint, synergetic amplification and synergetic diversification, we proposed to build an integrated disaster risk governance consilience model under the leadership of governments and with enterprises as the main body and the full participation of communities, with multiple optimization objectives of social consent maximization, cost minimization, welfare maximization, and risk minimization. Finally, we elaborated on the synergy of human and nature through "changing nature appropriately", with a case study on the Dujiangyan irrigation system, which enabled the win-win pattern of disaster reduction and benefit making.

    Reference | Related Articles | Metrics
    Cited: CSCD(7)
    Explanation of land use/cover change from the perspective of tele-coupling
    Enpu MA, Jianming CAI, Jing LIN, Yan HAN, Liuwen LIAO, Wei HAN
    Acta Geographica Sinica    2019, 74 (3): 421-431.   DOI: 10.11821/dlxb201903002
    Abstract3226)   HTML330)    PDF (1686KB)(1937)      

    The existing research on the mechanism of LUCC cannot fully illustrate dynamics of land use/cover driven by long-distance interaction in the global context. To fill this gap, a theoretical framework of tele-coupling interpretation is intentionally introduced in this paper. Starting with a general overview of previous studies on the mechanism of LUCC in perspectives of human society development, and followed by the empirical evidence for these mechanisms, this paper proposes an initial framework of tele-coupling interpretation. It is concluded that remote connection, globalization, and urbanization are the three major forms of tele-coupling that have driven LUCC. Specifically, in terms of environmental interactions between long-distance natural systems, climate change and large-scale climate events have cross-regional impacts. For example, they can directly affect vegetation dynamics by changing climate factors such as temperature and precipitation, resulting in the climatic tolerance range of vegetation, which in turn could change the distribution pattern of vegetation, leading to the land use/cover change. For socio-economic interactions between distant human systems, the globalization process may drive the land use/cover change through transmission and feedback of various flows of information, technologies, capital and goods at different levels of administrative spaces. Regarding to urbanization, it could alter the land use/coverage in remote areas directly or indirectly through the process of production factor aggregation. Based on these elaborations, this paper further puts forward the key contents and basic steps of the application of tele-coupling framework in LUCC research. Firstly, a "time-space-event" trinity analysis path of land use/cover change is established, which links the spatio-temporal dynamics of land use/cover with the sequence of events that drive the change. This kind of analysis seeks to use specific social, economic, and natural events to explore the driving forces to land use/cover change. The operational analytical method with five steps is thus proposed for this purpose. Secondly, the distance decay curve method and the event sequence classification method inside and outside the area should be applied for decomposing driving forces to the near-remote land use/cover change. Finally, a comprehensive network-based inter-system study or cross-system synthesis is badly needed to better understand land use/cover change at the regional (global) scale. Cross-system synthesis is the key step to realize the transformation from micro case studies to a macroscopic comprehensive integration, and its primary mission is to clarify the mutual feedback of factor flows between multiple systems and their impact on land use/cover change. In conclusion, the new method is expected to achieve a synchronous explanation of land use/cover change driven by multiple long-distance systems, in an aim to have a holistic and better understanding of the human-nature coupling system at the regional (global) scale.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(7)
    Principle of big geodata mining
    Tao PEI, Yaxi LIU, Sihui GUO, Hua SHU, Yunyan DU, Ting MA, Chenghu ZHOU
    Acta Geographica Sinica    2019, 74 (3): 586-598.   DOI: 10.11821/dlxb201903014
    Abstract3233)   HTML264)    PDF (1932KB)(1905)      

    This paper reveals the principle of geographic big data mining and its significance to geographic research. In this paper, big geodata are first categorized into two domains: earth observation big data and human behavior big data. Then, another five attributes except for "5V", including granularity, scope, density, skewness and precision, are summarized regarding big geodata. Based on this, the essence and effect of big geodata mining are uncovered by the following four aspects. First, as the burst of human behavior big data, flow space, where the OD flow is the basic unit instead of the point in traditional space, will become a new presentation form for big geodata. Second, the target of big geodata mining is defined as revealing the spatial pattern and the spatial relationship. Third, spatio-temporal distributions of big geodata can be seen as the overlay of multiple geographic patterns and the patterns may be changed with scale. Fourth, big geodata mining can be viewed as a tool for discovering geographic patterns while the revealed patterns are finally attributed to the outcome of human-land relationship. Big geodata mining methods are categorized into two types in light of mining target, i.e. classification mining and relationship mining. The future research will be facing the following challenges, namely, the aggregation and connection of big geodata, the effective evaluation of mining result and mining "true and useful" knowledge.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(9)
    Spatio-temporal coupling of demographic-landscape urbanization and its driving forces in China
    WU Yifan,LIU Yansui,LI Yurui
    Acta Geographica Sinica    2018, 73 (10): 1865-1879.   DOI: 10.11821/dlxb201810004
    Abstract1111)   HTML44)    PDF (4240KB)(1897)      

    Urbanization is an inevitable trend of modernization and the fundamental transition in socioeconomic structure, human production and life style. China is undergoing a rapid and unprecedented urbanization process, and has achieved the short-term goals that European and American countries attained in the past decades or even centuries ago. This kind of rapid expansion has inevitably led to a serious imbalance between urban land expansion and urban population growth. We used the demographic-landscape urbanization coupling relationship index (ratio of the annual average growth rate of demographic permanent population and urban development land) to explore the spatio-temporal characteristics of demographic-landscape urbanization coupling situation, and further explain its driving forces during the past decade in China. All analyses, based on the demographic statistics and landscape dataset of 636 cities in China, aimed to identify and diagnose six coupling types. Furthermore, we made the macro pattern of urbanization development level more visible with the help of Kernel Density spatial analysis tool. Results show that: (1) Over the past decade, the average annual growth rate of urban development land in China was 1.65 times that of the urban population, and demographic-landscape urbanization coupling situation was poorly coordinated. (2) We found that there is a spatial dependency between demographic urbanization and landscape urbanization. Moreover, the spatial agglomeration center of high-density urban population showed a gradual westward moving trend. Meanwhile, urbanization development mode shifted from "land lag" to "population lag". (3) Generally, the area of per capita urban development land has exceeded the standard threshold; and 41.96% of the cities currently have a development land area per capita more than five times of the ideal value. (4) The proportion of three coordination types was 73.25%, which is much higher than that of three incoordination types (26.75%). Among them, "Both Growth and Uncoordinated Type" took the largest proportion of 43.27%, which reflects the uncoordinated relationship between demographic urbanization and landscape urbanization. This situation will continue or even is intensified in the years to come. Additionally, the cities located at the edge of urban agglomeration seemed to be more uncoordinated than cities at the center. This is probably because that the cities at the edge of urban agglomeration, which had a small population and low property price, relied more on the "land finance" to earn their main source of urban economic income. (5) Economic development level, population size, governmental decision-making behaviors, geographical location and regional disparity were all driving factors of demographic-landscape urbanization. In addition, there are few obvious differences in the mechanism and effect of these factors. To sum up, urban population and land use management in the new era should get more attention according to the new trend in system diagnosis and comprehensive analysis, thus to provide a scientific basis in development decision for new urbanization and urban-rural integration strategy as well as the rural revitalization strategy.

    Reference | Related Articles | Metrics
    Cited: CSCD(27)
    Dynamic simulation of urbanization and eco-environment coupling: A review on theory, methods and applications
    CUI Xuegang,FANG Chuanglin,LIU Haimeng,LIU Xiaofei,LI Yonghong
    Acta Geographica Sinica    2019, 74 (6): 1079-1096.   DOI: 10.11821/dlxb201906002
    Abstract1645)   HTML139)    PDF (1530KB)(1857)      

    At present, urbanization and eco-environment coupling has become a research hotspot. Owing to the complexity of the coupling mechanism, as well as the limitation of mathematical statistics methods, the process simulation of urbanization and eco-environment coupling needs to be strengthened. Based on the systems science and cross-scale coupling theory, we can define the coupled urbanization and eco-environment system as a nonlinear open system with multiple feedbacks. Based on the above analysis, the progress of dynamic simulation for urbanization and eco-environment coupling is reviewed. (1) As dynamic simulation has become a trend, the relevant analysis of theory and mechanism is being improved. (2) Dynamic simulation technologies have shown a trend of diversified, refined, intelligent and integrated pattern. (3) The simulation application mainly focuses on three aspects, including multiple-case regions, multiple elements, local coupling and telecoupling, and regional synergy. In addition, we found some shortcomings. (1) The development and integration of basic theories are insufficient. (2) The method integration and data sharing is lagging. (3) The coupling relational chains and dynamic characteristics of the main control elements are not fully revealed. Besides, telecoupling simulation is not quantified and systematically integrated, and could not be effectively applied to spatial synergy. In future, we should promote the intersection of research networks, technology integration and data sharing, and then uncover the evolution process of coupling relational chains and the main control elements in urban agglomerations. Finally, we should build decision-making support systems for regional sustainable urbanization.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(2)
    The outline and genealogy of Chinese pilitical geography
    LIU Yungang,AN Ning,WANG Fenglong
    Acta Geographica Sinica    2018, 73 (12): 2269-2281.   DOI: 10.11821/dlxb201812001
    Abstract1628)   HTML38)    PDF (974KB)(1813)      

    This paper outlines the development trajectory and genealogical features of political geography in contemporary China. It first maps the development of political geography in Western academia and summarizes the genealogical characteristics of Western political geography. Taking the Western political geography as a baseline, it then discusses the establishment and development of political geography in contemporary China and divides this process into three stages since the founding of new China: the germination period, the stagnant period, and the revival period. Based on the work of extant (typical) scholars, related studies and relevant genealogical developments in each stage, this paper explores the main genealogical characteristics of political geography in China. Five major branches are extracted, which are respectively represented by Zhang Qiyun, Bao Juemin, Li Xudan, Zhang Wenkui and Wang Enyong. On this basis, this paper studies the similarity and difference between Chinese and Western political geography by focusing on their developing trajectories and features. This paper argues that: the development of political geography in China has been long influenced by the exogenous theories and notions and for this reason there is an apparent binary division between exogenous and endogenous political geography theories in China; the methodology, concepts and systems of this sub-discipline are still insufficient, and establishment of a unified academic community and the construction of subject knowledge system is therefore urgently needed. Finally, this paper proposes an agenda for future Chinese political geographical studies and calls for a more balanced and locally rooted Chinese political geography.

    Reference | Related Articles | Metrics
    Cited: CSCD(5)
    Spatio-temporal characteristics of evapotranspiration and its relationship with climate factors in the source region of the Yellow River from 2000 to 2014
    YE Hong,ZHANG Tingbin,YI Guihua,LI Jingji,BIE Xiaojuan,LIU Dong,LUO Linling
    Acta Geographica Sinica    2018, 73 (11): 2117-2134.   DOI: 10.11821/dlxb201811006
    Abstract1205)   HTML37)    PDF (6392KB)(1801)      

    Located at the eastern margin of the Tibetan Plateau, the source region of the Yellow River is an important ecological security shelter for economic development in Southwest China, with its unique natural habitats and abundant natural resources. Based on the data of 18 meteorological stations within and around the source region, map of China vegetation types (1:1000,000) and DEM data, and using the methods of trend analysis, relative inter-annual variation and correlation analysis, we selected MODIS evapotranspiration (ET) as the main data source to research the spatio-temporal characteristics of ET and its variation under different land use types as well as its relationship with climate factors in the study area from 2000 to 2014. The results indicate that: (1) the regional differentiation of mean ET over years is obvious, the northern ET is significantly weaker than that of the central and southeastern parts, and the strongest ET is observed in the southeastern part. The multi-year mean value of ET is 538.61 mm/a, and the anomaly relative variation is obvious. In addition, the trend of inter-annual variation of ET decreases firstly and then increases, and the trend variation rate is 0.44 mm/a. (2) During the study period, the ET shows a periodic unimodal trend and peaks in July. Moreover, seasonal differences of ET are apparent in the source region of the Yellow River, and the highest value of ET reaches 188.14 mm/a in summer, followed by spring and autumn, yet the lowest is only 97.15 mm/a in winter. (3) From 2000 to 2014, the value of ET in different types of land use has a similar regular pattern, namely: wetland > forest > grassland > other types > bare land. On the whole, the value of ET in each type of land use increases gradually. (4) According to the correlation analysis results, there are positive correlations between ET and air temperature, as well as between ET and precipitation, while ET has a negative correlation with relative humidity. The effect of precipitation on ET is stronger than that of air temperature. Furthermore, the result of ET driven by different factors demonstrates that the climate-driven region of ET is predominantly precipitation-driven in the source region of the Yellow River.

    Reference | Related Articles | Metrics
    Cited: CSCD(6)
    Comprehensive evaluation on China's man-land relationship: Theoretical model and empirical study
    YANG Yu,LI Xiaoyun,DONG Wen,HONG Hui,HE Ze,JIN Fengjun,LIU Yi
    Acta Geographica Sinica    2019, 74 (6): 1063-1078.   DOI: 10.11821/dlxb201906001
    Abstract2219)   HTML245)    PDF (4667KB)(1785)      

    Relationship is a classic concern of geographical research, which is also a research field where China's human and economic geography has made notable contributions to international geographical research. The connotation of man-land relationship changes constantly during its dynamic evolution process. Therefore, a scientific evaluation on the status of modern man-land relationship in China is the basis for an accurate understanding of it with which paths of coordinating conflicts between man and land can be sought. Based on the territorial system theory of man-land relationship and a review of the new characteristics of modern man-land relationship in China, this study constructs a theoretical framework to make a comprehensive evaluation on man-land relations using the following four indicators: intensity of human activities, carrying capacity of core resources, ecological and environmental constraints, and openness of man-land system. Counties are taken as the basic spatial units in the evaluation. The following results are found: there are apparent differences between eastern and western China in terms of intensity of human activities and the distribution pattern of it follows the layout of core urban agglomerations; the carrying capacities of core resources take on a relatively dispersed spatial distribution; there is a high level of spatial mismatch between land, water, core energy resources, and the intensity of human activities, which intensifies the tension of regional man-land relationship; areas with strong ecological and environmental constrains are concentrated on both sides of the Heihe-Tengchong Line (also known as the Hu Huanyong Line) and in the southwestern part of the Qinghai-Tibet Plateau; overall, the level of openness of China's man-land system is not high, with relatively open areas mainly concentrated in economically developed regions. The evaluation results show that about 86% of the regions in China are faced an unstrained man-land relationship, but noticeable man-land conflicts are found in some areas, particularly in southeastern coastal areas. In the western region of China, man-land relationship is relatively unstrained though the level of man-land system evolution is low.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(5)
    The Coupled Human and Natural Cube: A conceptual framework for analyzing urbanization and eco-environment interactions
    LIU Haimeng, FANG Chuanglin, LI Yonghong
    Acta Geographica Sinica    2019, 74 (8): 1489-1507.   DOI: 10.11821/dlxb201908001
    Abstract2280)   HTML461)    PDF (3788KB)(1758)      

    The coupled urbanization and eco-environment system is an important aspect of coupled human and natural systems. However, the time-space compression, long range interactions, and reconstruction of socio-economic structure at the global scale pose great challenges to the traditional analysis frameworks for human-nature systems. We are in urgent need of developing a brand new analysis framework. In this paper, based on the connotation of the coupled urbanization and eco-environment system and its four dimensions — space, time, appearance and organization, we propose a conceptual framework "Coupled Human and Natural Cube (CHNC)" to explain the coupling mechanism between urbanization and eco-environment, which is inspired by the theories including human-earth areal system, telecoupling, planetary urbanization, and perspectives from complexity science. We systematically introduce the concept, connotation, evolution rules and analysis dimensions of the CHNC. It is worth noting that there exist various "coupling lines" in the CHNC, which connects different systems and elements at multiple scales, and forms a nested, interconnected organic bigger system. The rotation of the CHNC represents the spatiotemporal nonlinear fluctuation of the urbanization and eco-environment system in different regions. As the system exchanges energy with the environment continually, the critical phase transition occurs when fluctuation reaches a certain threshold, and leads to emergence behaviors of the system. The CHNC has four dimensions — pericoupling and telecoupling, syncoupling and lagcoupling, apparent coupling and hidden coupling, intra-organization coupling and inter-organization coupling. We mainly focus on the theoretical connotation, research methods and typical cases of telecoupling, lagcoupling, hidden coupling, and inter-organization coupling, and finally put forward a human-nature coupling matrix to integrate multiple dimensions. In summary, the CHNC provides a more comprehensive and systematic research paradigm for understanding the evolution and coupling mechanism of the human-nature system, which expands the analysis dimension of coupled human and natural systems, and provides some scientific supports to formulate regional sustainable development policies for human wellbeing.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(8)
    Research progress and trends of parallel processing, analysis, and mining of big spatiotemporal data
    Xuefeng GUAN, Yumei ZENG
    PROGRESS IN GEOGRAPHY    2018, 37 (10): 1314-1327.   DOI: 10.18306/dlkxjz.2018.10.002
    Abstract1307)   HTML20)    PDF (3969KB)(1749)      

    With the rapid development of the Internet, Internet of things, and cloud computing technology, data with geographical location and time tag are accumulated in an explosive way, and this indicates that we are in the era of big spatiotemporal data. In addition to the typical "4V" characteristics, big spatiotemporal data also contain rich semantic information and dynamic spatiotemporal patterns. Although massive spatiotemporal data have promoted the evolvement of various cross-disciplinary studies, traditional methods of data processing and analysis would no longer meet the requirements of efficient storage and real-time analysis of such data. Therefore, it is of great importance to integrate big spatiotemporal data with high-performance computing/cloud computing. To address this problem, this article begins with the concept and origin of big spatiotemporal data, and introduces its unique characteristics. Then, the performance requirements generated by current big data applications are analyzed, and the status quo of the underlying hardware and software is summarized. Furthermore, the article comprehensively reviews parallel processing, analysis, and mining methods for big spatiotemporal data. Finally, we conclude with the challenges and opportunities of storage, management, and parallel processing analysis of big spatiotemporal data.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(5)
    Regional disparity and the influencing factors of land urbanization in China at the county level, 2000-2015
    GAO Jinlong,BAO Jingwei,LIU Yansui,CHEN Jianglong
    Acta Geographica Sinica    2018, 73 (12): 2329-2344.   DOI: 10.11821/dlxb201812005
    Abstract1410)   HTML82)    PDF (8273KB)(1739)      

    In the unprecedented urbanization process in China, urbanized land has expanded quickly at the same pace or even faster than the growth of the urban population. Employing both the ordinary least square and geographical weighted regression, we analyzed the spatial patterns and factors influencing land urbanization at the county level in 2000 and 2015. This analysis was assisted by land-use data for China acquired from the resource and environment data cloud platform. The research reveals the following points: (1) The annual growth rate of land urbanization experienced 2.77 percentages on average from 2000 to 2015. About 40% of the counties witnessed an annual increase of 3% or above. Land urbanization was manifested in a pattern of diffusion, which differed from the continued spatial polarization of demographic urbanization in China. (2) Geographically, the north-south differentiation of land urbanization was clearer than the east-west differentiation. And the high-value regions tended to be located to the southeast of "Hu Line". Counties surrounding those metropolitan areas were detected as hotspots of land urbanization. In general, there was a convergent trend of land urbanization among regions in China. (3) The factors of population growth, economic development, industrial structure, city/county features, and geographical location have played significant roles in the spatial disparities of land urbanization at the county level. Besides, the spatio-temporal dependence of their influences were also explored. This study on land urbanization and its influencing factors at the county level advances our theoretical and practical understandings of the new-type urbanization, urban and rural integration, and rural revitalization strategies in contemporary China.

    Reference | Related Articles | Metrics
    Cited: CSCD(9)
    The comprehensive evaluation of regional resources and environmental carrying capacity based on PS-DR-DP theoretical model
    WANG Liang,LIU Hui
    Acta Geographica Sinica    2019, 74 (2): 340-352.   DOI: 10.11821/dlxb201902010
    Abstract1259)   HTML62)    PDF (1362KB)(1668)      

    There are many achievements on the state evaluation of resources and environmental carrying capacity. Most of the studies use the traditional analysis method together with the "Pressure-State-Response" model. This article first constructs a comprehensive evaluation framework system of regional resources and environmental carrying capacity. Then it builds the "PS-DS-DP" hexagon interactional theory model and divides the carrying capacity into three pairs of interaction forces, namely "Pressure-Support", "Destructiveness-Resilience" and "Degradation-Promotion", which correspond to resources supporting ability, environmental capacity and risk disaster resisting ability, respectively. The negative load of carrying capacity includes pressure, destructiveness and degradation, while support, resilience and promotion represent the positive ones. With the changes of the shape and area of the hexagon caused by the interaction forces, the state of regional resources environmental carrying capacity could be measured. This study figures out that the state value of carrying capacity is equal to the ratio of the positive contribution value to the negative contribution value. The regional load condition shows good if the ratio is over 1, and the bigger the better. Once the ratio is less than 1, it has to be warned. Regional carrying capacity rating standards in this paper are delimited by 4 levels: Ⅰ(≤0.30), Ⅱ(0.30-0.70), Ⅲ(0.70-0.85) and Ⅳ(≥0.85) corresponding to a lower level balance load for a region with an approximate stable state, an unstable state caused by the high speed increasing, an ideal carrying capacity of an approximate stable state, and a full load with the system collapse. A perfect state is not to reach the limit while remaining the system stable. Based on the above theoretical models and the earlier achievements, this research applies the classified-array polygon method to explore the state change of resources environmental carrying capacity of Beijing from 2010 to 2015. According to the general research hypothesis, the increasing population will add to the regional resources pressure. But Beijing's resource pressure has a slight decrease as the city's population grows, which differs from the conclusions that the city was overloaded. The result shows that Beijing is getting close to a perfect state. The state value of carrying capacity was 1.0143 in 2010 and increased to 1.1411 in 2015, suggesting that Beijing's carrying capacity turned better in 2010-2015. Compared to 2010, the negative factor forces became weakened and the positive ones continued to enhance in 2015. With the average rank value achieving 0.7025 in 2015, Beijing reached the optimal load threshold and still had space for further carrying. Finally, these results give a theoretical support for Beijing to control the population within 23 million by 2020.

    Reference | Related Articles | Metrics
    Cited: CSCD(9)
    Ten major scientific issues concerning the study of China’s north-south transitional zone
    Baiping ZHANG
    PROGRESS IN GEOGRAPHY    2019, 38 (3): 305-311.   DOI: 10.18306/dlkxjz.2019.03.001
    Abstract1901)   HTML18)    PDF (3214KB)(1658)      

    Since the Qinling-Huaihe line was delimited as the boundary between north and south China in 1958, discussions on the local position of the line, criteria for dividing temperature zones, the line's environmental effect, among others, are ongoing. The National Basic Resources Investigation Program "Integrated Scientific Investigation of the North-South Transitional Zone" launched in 2017, introduced the concept of north-south transitional zone (Qinling-Daba Mountains) and planned to explore the north-south dividing line from the perspective of transitional zone, so as to strengthen and make some breakthroughs in the study of the north-south division. The Qinling-Daba Mountains are the main body of China's north-south transitional zone, with multi-dimensional zonal structures and high degree of environmental complexity, biological diversity, and climatic sensitivity. The following 10 scientific issues need to be dealt with in the years to come: 1) The relationship between the north-south dividing line and the north-south transitional zone; 2) improvement of criteria for identifying subtropical and warm-temperate zones; 3) integral north-south series and variation of vegetation and soil types; 4) relationship between global warming and spatial change of key bioclimatic criteria; 5) decomposition and integration of multi-dimensional zonal structures in the Qinling-Daba Mountains; 6) pattern and mechanism of biological diversity and endemics; 7) the corridor effect of the Qinling-Daba Mountains; 8) regional environmental effect of the Qinling-Daba Mountains and implications for the national ecological security; 9) significance and position of the Qinling-Daba Mountains for the history and development of China; and 10) significance of the geographic structure of Western Qinling Mountains for the origin of the Chinese civilization. These key issues are not only the results of previous research, but also the starting point for further exploration and study in the future. They are intended to inspire and encourage an in-depth study of China's north-south dividing line or transitional zone, and to provide new perspectives and framework for the exploration of physio-geographic theories, biodiversity, and ecological security, and even the birthplace of the earliest Chinese civilization.

    Table and Figures | Reference | Related Articles | Metrics
    Review and prospect of application of nighttime light remote sensing data
    Yingbiao CHEN, Zihao ZHENG, Zhifeng WU, Qinglan QIAN
    PROGRESS IN GEOGRAPHY    2019, 38 (2): 205-223.   DOI: 10.18306/dlkxjz.2019.02.005
    Abstract3541)   HTML72)    PDF (1963KB)(1648)      

    In remote sensing research, night light remote sensing as an important branch of active development has attracted increasingly more attention from the fields of natural and social science research in recent decades. Different from traditional daytime optical satellite remote sensing that obtains ground object radiation information, nighttime light remote sensing is the acquisition of visible-near-infrared electromagnetic information transmitted from the Earth's surface under cloud-free conditions at night. Compared to the ordinary satellite remote sensing images, ground light intensity information recorded by the night light images directly reflects the difference of human activity. Therefore, it is widely used in urbanization research, extraction of impervious surfaces, estimation of socioeconomic indicators, major events assessment, ecological environment assessment, and other fields. At present, although research results based on nighttime light data are continuously accumulating, there is a general lack of systematic review of these results and the current reviews suffer from incomplete coverage and poor timeliness. Therefore, this article summarizes the research results of nighttime light data in recent decades and examines them from the aspects of data processing and technical approaches, urbanization application research, and parameterization. Finally, we identify the following three research hotspots: multi-source data fusion, application expansion, and short-period surface light monitoring.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(1)
    Pattern evolution and formative mechanism of aging in China
    ZHOU Rong, ZHUANG Rulong, HUANG Chenxi
    Acta Geographica Sinica    2019, 74 (10): 2163-2177.   DOI: 10.11821/dlxb201910015
    Abstract1535)   HTML124)    PDF (5061KB)(1631)      

    Based on the Sixth National Census and annual China Statistical Yearbook, the paper characterizes the spatial patterns and variation features of the "quantity" and "quality" of China's aging and its mechanism over the past 30 years or more by using spatial autocorrelation, Sullivan healthy life expectancy measurement model, and geographical weighted regression. The results are shown as follows: (1) Overall, the development of "quantity" of aging is not coordinated with that of "quality", and there are spatial differences between them. (2) In terms of "quantity", the figure of aging in the southeast half of "Hu Huanyong Line" is higher than that in the northwest half, but the change of growth rate has a phased feature. There are high and low value agglomeration areas at the aging level. The high-value agglomeration area expands from the coastal area to the inland area, while the low-value agglomeration area located in the northwest of China is gradually shrinking. (3) In terms of "quality", the figure of the southeast half of "Hu Huanyong Line" is better than that of the northwest half, and the eastern coastal provinces enjoy far higher figures than other regions. (4) In terms of "quality" characteristics represented by life expectancy, the figure of the life expectancy and the healthy life expectancy are not synchronized, and there are gender differences and morbidity expansion effect. Compared with the central and western regions, the eastern region has higher life expectancy and healthy life expectancy. (5) From the perspective of formation mechanism, the formation of the "quantity" pattern of aging is affected by the interaction between natural and migrating population variations, with the birth rate being the major element. As for "quality", differences in natural environment and uncoordinated development of social environment are significant factors affecting life expectancy, and economic development and the health and medical services progress are the main driving forces for greater longevity.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(2)
    Geomorphological regionalization theory system and division methodology of China
    CHENG Weiming,ZHOU Chenghu,LI Bingyuan,SHEN Yuancun
    Acta Geographica Sinica    2019, 74 (5): 839-856.   DOI: 10.11821/dlxb201905001
    Abstract2448)   HTML251)    PDF (4541KB)(1626)      

    Geomorphological regionalization and geomorphological types are the two core contents of geomorphologic research. Despite that there are many research achievements on the study of geomorphological regionalization, defects still exist such as the inconsistence of landform indicators, the small quantity of division grades, the disparity of geomorphological characteristics, the difference of mapping results and the small scale of zoning maps. New requirements for the national geomorphological regionalization therefore should be proposed at the request of national geo-information surveying and other national specific projects. On the basis of combing the theories of geomorphological regionalization in China including plate tectonics and crustal features, geomorphological features from endogenic and exogenic forces, and differences and regional differentiations of geomorphological types, a new research program of China's geomorphological regionalization with five grades, that is, major region, sub-major region, region, sub-region and small region, was proposed based on the previous geomorphological regionalization proposed in 2013 which divided the whole China into 6 major geomorphological regions and 37 districts. The major contents of the new geomorphological regionalization program can be summarized as follows: (1) principles of the national multi-grades geomorphological regionalization were established, (2) hierarchical indicator systems of the geomorphological regionalization (i.e. characteristics of the terrain ladder under the control of tectonic setting, combinations of regional macro-form types, combinations of endogenic and exogenic force and basic types of morphology, combinations of regional morphological types, combinations of regional micro-morphological types) were constructed, (3) naming rules and coding methods of the geomorphological regionalization were proposed, (4) precise positioning techniques and methods of the multi-grades geomorphological regionalization based on multi-source data were developed. On the basis of this new geomorphological regionalization project, the partitioning works of national five-grade geomorphological regionalization of 1:250,000 of China were successfully completed. And the geomorphological regionalization systems of the whole China were divided into 6 major regions, 36 sub-major regions, 136 regions, 331 sub-regions and more than 1500 small regions. In addition, the database and the management information system of the national geomorphological regionalization were then established. This research is of important guiding significance for promoting the development of China's regional geomorphology and the application research based on geomorphological regionalization.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(5)
    The evolution and mechanisms of megalopolitan knowledge polycentricity of Guangdong-Hong Kong-Macao Greater Bay Area
    MA Haitao,HUANG Xiaodong,LI Yingcheng
    Acta Geographica Sinica    2018, 73 (12): 2297-2314.   DOI: 10.11821/dlxb201812003
    Abstract1319)   HTML70)    PDF (5379KB)(1598)      

    The concept of megalopolis, since its original inception six decades ago, has inspired many new terms that mainly describe large-scale urbanized forms such as megaregions and polycentric urban regions. However, recent studies have increasingly focused on the two key functions that megalopolises act as an incubator of new ideas and trends and as a hub that articulates knowledge exchange at the megalopolitan, national, and global scales. While the recent studies have mainly analyzed the functional aspects of megalopolis based on China's Yangtze River Delta region, this paper investigates the evolving process and mechanisms of knowledge collaboration within and beyond Guangdong-Hong Kong-Macao Greater Bay Area (GBA) - one of the most promising and vibrant megalopolises in China. In addition, the GBA megalopolis is unique because it contains Hong Kong and Macao, which have a different political system from China's mainland. Drawing upon a dataset of publications that were indexed in Web of Science Core Collection during the 1990-2016 period, this paper uses the Gini coefficient to measure the degree of knowledge polycentricity of the GBA megalopolis. Here, knowledge polycentricity is further classified into attribute polycentricity of knowledge production and functional polycentricity of knowledge collaboration within and beyond the GBA megalopolis. Whereas the attribute polycentricity refers to the distribution inequality of the total publications of GBA cities, the functional polycentricity represents the distribution inequality of GBA cities' knowledge collaboration at different geographical scales. Our empirical results show: (1) knowledge production of the GBA megalopolis as a whole has experienced a robust and continuous growth. The degrees of both attribute polycentricity and functional polycentricity have also been on the increase in general, although there are some fluctuations in early years and some deviations in recent years. During the ten years after Hong Kong and Macao returned to China (the 2000-2010 period), the degree of knowledge polycentricity of the GBA megalopolis especially enjoyed the fastest rise; (2) The degree of functional polycentricity decreased with the expansion in the geographical scales at which it is measured, confirming the findings of previous studies that functional polycentricity is scale-dependent. Moreover, we find that the degree of functional polycentricity becomes more fluctuated at the global scale while it tends to increase continuously at the megalopolitan scale; (3) The evolving process of knowledge polycentricity of the GBA megalopolis is influenced by institutional proximity, geographical proximity and status proximity between cities. Specifically, the mobility of researchers, the collaboration of universities and research institutes, and the coordination of local governments are three major forces promoting the evolution of knowledge polycentricity of the GBA megalopolis. Overall, the increasing knowledge polycentricity would be of significance for the GBA megalopolis to form a knowledge-driven region of collective collaboration.

    Reference | Related Articles | Metrics
    Cited: CSCD(14)
    The evolution process and regulation of China's regional development pattern
    FAN Jie, WANG Yafei, LIANG Bo
    Acta Geographica Sinica    2019, 74 (12): 2437-2454.   DOI: 10.11821/dlxb201912002
    Abstract1935)   HTML184)    PDF (5095KB)(1593)      

    China's per capita GDP has reached 64520 yuan (about 10,000 US dollars). The development process of countries around the world and the inverted U-shaped curve of regional development gaps indicate that the evolution of China's regional development pattern will step into an inflection point segment and that the development gap between regions has witnessed a switch from continuing widening to narrowing. In this paper, we discuss the evolution process of China's regional development pattern over the 40 years since 1978 before the inflection point: (1) The gap in per capita GDP between the upstream areas (the top 9 most developed provinces) and the downstream (the last 8 underdeveloped provinces) increased from 407 yuan in 1978 to 53817 yuan in 2018. (2) Under the pull of export-oriented economy and non-state-owned economy, the mean center of urbanization and economic development rotates in a clockwise direction. Southeast China has become an area with accelerated economic agglomeration. (3) China's regional development pattern has presented a diamond structure with the four core regions of Beijing-Tianjin-Hebei, the Yangtze River Delta, the Pearl River Delta and Chengdu-Chongqing as the apex and the connection of adjacent regions as the boundary. The GDP in these regions accounts for about 75% of the national total. In 2020, China's regional development pattern will enter an inflection point of evolution. The form is characterized by the narrowing of the regional economic gap, which is essentially a transition from non-high-quality regional development to high-quality regional development. The high-quality development of the region is a process of growth in which the ecological and social benefits will be basically synchronized in the process of sustained economic growth, and a regional high-quality development model that is differentiated by geographical functions is presented. In the next 30 years, the regulation and optimization of China's regional development pattern should focus on three types of regions: key urbanization regions, relatively underdeveloped regions, and key areas for security, as well as inter-regional interactions according to the dual objectives of promoting regional balanced (coordinated) development and high-quality development. Establishing a space governance system with the major function zoning-strategy-planning-system as the mainstay will become the basic guarantee for regulating and optimizing the regional development pattern.

    Table and Figures | Reference | Related Articles | Metrics
    Cited: CSCD(9)
    Reconstruction of runoffs over Upper-Middle Reaches of Yellow River and its relationship between PDO since AD 1766
    PAN Wei, ZHENG Jingyun, MAN Zhimin
    Acta Geographica Sinica    2018, 73 (11): 2053-2063.   DOI: 10.11821/dlxb201811001
    Abstract905)   HTML24)    PDF (4725KB)(1584)      

    This study, through establishing the regression model, inverts the annual runoff of 1766-1911 AD, builds up and improves the annual runoff series of 1766-2000 AD in flood season in Lanzhou, Qingtongxia and Sanmenxia by using the records of water level stake of three gauge stations in the Upper-Middle Yellow River (UMYR) in the Qing Dynasty. Combining the annual runoff of 1766-1911 AD at Tangnaihai Station in riverhead reach, the study builds the runoff series of four stations at the riverhead and UMYR, which is presently the clearest runoff curve of the Yellow River by historical records. According to the research, the heavy "river disaster" that appeared in the lower Yellow River in the mid-19th century was caused by sudden changes of the runoff at the Qingtongxia-Sanmenxia section. Drought period of the river in the 1920s existed from the riverhead to the middle reach, but it was not caused by sudden changes. Meanwhile, the study also reveals that PDO and the runoff of the UMYR had a periodic inverse phase relationship on the interdecadal scale. In the early and mid-20th century, the runoff of the four stations had an inverse phase relationship on the scale of 8-16 years. In the 1830-1850s, the inverse phase relationship between PDO and flow on the scale of 4-6 years was more obvious at Lanzhou-Sanmenxia section. According to the interactive wavelet analysis, there is a significant inverse correlation between PDO and the amount of water in the UMYR on a scale of 8-16 years, but only at the Sanmenxia-Lanzhou section, suggesting that the relationship between summer rainfall in the UMYR and PDO had obvious temporal and spatial differences. (1) During the study period, the change of runoff flow in the UMYR had obvious differences; On the natural state, there was no obvious consistency in the flow change of the UMYR. The occurrence of sudden change time point was not synchronous in history. In the long term, the runoff change of the UMYR had a unique phenomenon. The simultaneous reduction of flows of each reach since the 1970s is a special phenomenon, at least it is the only phenomenon discussed in this study within this time range. (2) It is concluded that the correlation between the PDO and runoff in the UMYR is periodic and there is no special obvious linear relationship, but regional differences are more obvious. The inverse correlation between PDO and runoff in the study reaches is mainly on a decadal scale. The Lanzhou-Sanmenxia section is relatively sensitive in the face of the change of the PDO on the decadal scale. When formulating the water resources strategy of the Yellow River, we should notice the differences in the response of different sections to the same environmental background. (3) In the mid-19th century, many large-scale floods in the lower reach resulted from the sudden increase of runoff in the middle reach. In the reign of Emperor Daoguang of the mid-19th century, the Qing Dynasty declined rapidly. During this period, large-scale flood disasters occurred in many parts of eastern China, especially in the populous North China Plain and Taihu Basin. The flood brought huge financial and social losses. Among them, eastern Henan of North China Plain suffered from the flood disaster in successive years by burst of the Yellow River in the 1840s, and the central government spent a huge amount of money to solve the problem of the river, which greatly aggravated the financial difficulties in that period. The large-scale flood in the lower Yellow River corresponds to the period of sudden change of runoff flow in Sanmenxia section revealed by this research, which indicates the sudden increase of rainfall in the Loess Plateau. Climate change was deeply involved in China's decline and depression during the reign of Daoguang. (4) Although some progress has been made in reconstruction of multi-site and long-time runoff series of the Yellow River based on different materials, further work is needed in data analysis so as to make clear the sequences of uncertainty, thus enabling the integration of data in the future to provide basic data for further research on long-time spatial and temporal change of runoff of the Yellow River.

    Reference | Related Articles | Metrics
    Cited: CSCD(2)