Construction of “Biomigration – Regional Cooling” Multi-functional Ecological Network in Wuhan Urban Agglomeration
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LI Jiajie is a master student in the Faculty of Architecture and Urban Planning, Chongqing University. His research focuses on urban and rural ecological planning and design |
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GU Yuanyuan, Ph.D., is an associate professor and master supervisor in the Faculty of Architecture and Urban Planning, Chongqing University. Her research focuses on Neo-Marxist urban theory, and urban formation |
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XING Zhong, Ph.D., is a professor and doctoral supervisor in the Faculty of Architecture and Urban Planning, Chongqing University, a member of the Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, and a member of the Ecological Planning Committee, Urban Planning Society of China. His research focuses on urban and rural ecological planning and design |
Received date: 2024-03-20
Revised date: 2024-11-12
Online published: 2025-12-07
Copyright
[Objective] Rapid urbanization has encroached on large ecological spaces, causing ecological issues like biodiversity loss, heat island effect, and flooding. To address this, ecological networks composed of source sites, corridors, and stepping-stone patches are proposed to restore landscape connectivity and integrity, thereby ensuring ecological security. However, these networks have primarily focused on biodiversity conservation, neglecting other benefits to humans. This research, therefore, constructs a multifunctional ecological network in Wuhan by combining a biomigration network and a regional cooling network. This network is used to identify key areas for ecological restoration and protection, with a view to offering a reference for landscape conservation.
[Methods] In this research, the construction and optimization of the multifunctional network are divided into four steps. 1) Identification of two types of source patches. Based on the land cover and land surface temperature (LST) of Wuhan urban agglomeration, the research screens the biodiversity source sites and regional cold island source sites by morphological spatial pattern analysis (MSPA) and landscape connectivity. 2) Construction of two types of resistance surfaces. Based on land use type, elevation, slope, distance from road, distance from construction land, normalized difference vegetation index (NDVI) and other data, the resistance values of biomigration and cold island diffusion are calculated respectively, and raster resistance surfaces are generated in ArcGIS. 3) Based on minimum cumulative resistance (MCR) and circuit theory, biomigration corridors and regional cooling corridors are generated respectively by using the Linkage Mapper toolbox. 4) Two kinds of corridors are overlapped to form a multifunctional ecological network pattern, based on which the key areas for ecological protection and restoration are identified in Wuhan urban agglomeration.
[Results] In this research, Wuhan urban agglomeration is taken as the research area. Based on land cover data, satellite remote sensing data and other sources of data, and by integrating the methods of MSPA, landscape connectivity analysis and surface temperature inversion, 22 biodiversity and 27 regional cooling sources are identified, both of which are distributed in the northeastern and southern parts of the research area. Based on the MCR model and circuit theory, the multifunctional ecological network pattern of Wuhan urban agglomeration is constructed with the help of Linkage Mapper toolbox, including 44 biomigration corridors and 51 regional cooling corridors. Finally, by identifying the intersections, pinch points and obstacle points of the dual networks, the key areas for ecological restoration and protection of national land space under the perspective of multifunctional ecological network are located, including 7 intersections of the dual networks (biomigration network and regional cooling network), 85.4 km2 of pinch points and 724.9 km2 of obstacle points in the biomigration network, and 50.1 km2 of pinch points and 926.6 km2 of obstacle points in the regional cooling network.
[Conclusion] Aiming to further enhance human well-being through ecological network, this research integrates the biomigration network and the regional cooling network into a cohesive multifunctional ecological network framework. This integrated network sustains the regular functioning of diverse ecological processes by interlinking the supply sources of various ecological functions, thereby amplifying the protective benefits of species habitats across urban and rural landscapes and augmenting the thermal comfort of human settlements. Additionally, the overlay of the two types of ecological corridors respectively corresponding to the aforesaid two networks substantially enhances the overall connectivity and stability of the ecological network pattern. In conclusion, this research proposes a strategic planning approach for ecological conservation and restoration, aimed at fostering the connectivity of a complex functional ecological network. This strategy encompasses the protection of existing ecological sources, the cultivation of potential sources, the restoration of impediments within the dual networks, and the safeguarding of critical pinch points and intersections. The findings of this research hold significant implications for the ecological security and sustainable development of Wuhan urban agglomeration, offering a reference for the construction of large-scale multifunctional ecological networks.
Jiajie LI , Yuanyuan GU , Zhong XING . Construction of “Biomigration – Regional Cooling” Multi-functional Ecological Network in Wuhan Urban Agglomeration[J]. Landscape Architecture, 2025 , 32(1) : 96 -104 . DOI: 10.3724/j.fjyl.202403200166
表1 地表温度等级划分标准及取值范围Tab. 1 Criteria and range of values for LST classes |
| 等级区域 | 划分标准 | 取值范围/℃ |
| 注: | ||
| 高温区 | ||
| 较高温区 | ||
| 次高温区 | ||
| 常温区 | ||
| 次低温区 | ||
| 较低温区 | ||
| 低温区 | ||
表2 生物迁移阻力因子及其权重Tab. 2 Biomigration resistance factors and their weights |
| 阻力因子 | 权重 | 分类 | 阻力值 | 阻力因子 | 权重 | 分类 | 阻力值 | |
| 土地覆被类型 | 0.22 | 林地 | 1 | 高程/m | 0.14 | 1 | ||
| 耕地、草地 | 3 | 50~ | 3 | |||||
| 裸地 | 5 | 150~ | 5 | |||||
| 水体、湿地 | 7 | 250~ | 7 | |||||
| 建设用地 | 9 | 9 | ||||||
| 坡度/° | 0.17 | 1 | 距道路距离/m | 0.29 | 1 | |||
| 3~ | 3 | 2 500~ | 3 | |||||
| 8~ | 5 | 1 500~ | 5 | |||||
| 15~ | 7 | 500~ | 7 | |||||
| 9 | 9 | |||||||
| 距建设用地 距离/m | 0.18 | 1 | ||||||
| 2 500~ | 3 | |||||||
| 1 500~ | 5 | |||||||
| 500~ | 7 | |||||||
| 9 |
表3 冷源扩散阻力因子及其权重Tab. 3 Cold source diffusion resistance factors and their weights |
| 阻力因子 | 权重 | 分类 | 阻力值 | 阻力因子 | 权重 | 分类 | 阻力值 | |
| 土地覆被类型 | 0.63 | 水体、湿地 | 1 | 高程/m | 0.08 | 1 | ||
| 林地 | 3 | 420~ | 3 | |||||
| 草地 | 5 | 227~ | 5 | |||||
| 耕地 | 7 | 89~ | 7 | |||||
| 建设用地、裸地 | 9 | 9 | ||||||
| 距道路距离/m | 0.18 | 1 | NDVI | 0.11 | 1 | |||
| 2 500~ | 3 | 0.67~ | 3 | |||||
| 1 500~ | 5 | 0.46~ | 5 | |||||
| 500~ | 7 | 0.17~ | 7 | |||||
| 9 | 9 |
表4 双网络构建方法对比Tab. 4 Comparison between of the construction methods of the dual networks |
| 网络 类型 | 源地识别 | 阻力面构建 | 廊道生成 | |||||||
| 识别机制 | 构成要素 | 构建逻辑 | 权重指标 | 细节差异 | 功能目标 | 连接内容 | 生成方法 | |||
| 生物 迁移 网络 | 基于土地覆被类型 识别连通性较高的 大型生境斑块 | 以林地、草地、湿地、水体等自然生境为主 | 考虑地表要素对生 物迁移过程的影响 | 本网络中各因子权重差距较小,“距道路距离”具有最大权重(0.29) | 由于水体、湿地会阻碍生物运动,在生物迁移综合阻力面中为高阻力区域;高程越大,阻力越强 | 作为生物迁移的 高效路径 | 不同生物 多样性源地 | 基于Linkage Mapper 工具中的 Build Network and Map Linkages 模块 | ||
| 区域 降温 网络 | 通过地表温度反演 与分级识别地表热 环境中的低温斑块 | 区域热环境中能够减缓热岛效应的汇景观 | 考虑制约冷源在景观 格局中扩散的因素 | 本网络中各因子权重差距较大,“土地覆被类型”具有最大权重(0.63) | 由于水体、湿地具有较高热吸收能力,在冷岛综合阻力面中为低阻力区域;高程越大,阻力越弱 | 作为冷源扩散的 生态流通道 | 不同区域 冷岛源地 | |||
图8 武汉城市圈双网络累积电流与改善得分Fig. 8 Cumulative currents and improvement scores of the dual networks in Wuhan urban agglomeration |
文中图表均由作者绘制,其中图片底图来自国家地理信息公共服务平台(天地图,https://cloudcenter.tianditu.gov.cn/administrativeDivision),审图号为GS(2024)0650号。
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| 〈 |
|
〉 |