Simulation of urban expansion and its response to ecological resilience of typical oases in the Yellow River Basin
Received date: 2024-04-08
Revised date: 2024-07-04
Online published: 2026-03-11
Establishing a robust ecological network is essential for enhancing urban ecological resilience. Using the central urban area of Yinchuan City, a representative oasis city in the Yellow River Basin of China, as a case study, changes in the urban ecological network and its resilience responses to impervious surface expansion were simulated and analyzed using the PLUS model. The results indicate the following: (1) Rapid expansion of impervious surfaces has occurred in central Yinchuan City. The impervious surface area in 2020 expanded to be 2.61 times larger than that in 2000, and by 2030, the area is projected to be 3.24 times larger than in 2000. The spatial pattern of impervious surfaces evolved from an east-west longitudinal “一” pattern to a rightward-tilting “T” pattern, with further strengthening of this horizontal “T” pattern by 2030. (2) With the expansion of impervious surfaces, the ecological network pattern in the central urban area has undergone substantial changes. In 2000, a single-ring ecological network was observed around the urban fringe. By 2020, the outer ring expanded westward, and the inner ring shifted northward, forming a more intricate circuit in the northeastern sector. Simulations predict that by 2030, the ecological network will exhibit a “川” structure. (3) Both structural and functional resilience of the ecological network have improved. Between 2000 and 2020, the α, β, and γ indices increased by 0.09, 0.17, and 0.06, respectively, while network dissemination and diversity rose by 0.08 and 0.29, respectively. By 2030, further enhancements in structural and functional resilience are expected, though the overall resilience level will remain low.
Key words: oasis city; ecological networks; resilience; PLUS model; Yellow River Basin
Yuanyuan LIU , Caihong MA , Liya MA . Simulation of urban expansion and its response to ecological resilience of typical oases in the Yellow River Basin[J]. Arid Land Geography, 2025 , 48(3) : 506 -516 . DOI: 10.12118/j.issn.1000-6060.2024.219
表1 阻力因子赋值及权重Tab. 1 Assignment and weights of resistance factors |
| 阻力因子 | 分级指标 | 阻力值 | 权重 |
|---|---|---|---|
| 土地利用 | 林地 | 10 | 0.2264 |
| 草地 | 20 | ||
| 水体 | 30 | ||
| 耕地 | 70 | ||
| 未利用地 | 100 | ||
| 建设用地 | 150 | ||
| NDVI | [-0.260, -0.038) | 150 | 0.2854 |
| [-0.038, 0.112) | 110 | ||
| [0.112, 0.197) | 90 | ||
| [0.197, 0.289) | 60 | ||
| [0.289, 0.401) | 30 | ||
| [0.401, 0.609] | 10 | ||
| MSPA景观 | 核心区 | 10 | 0.1264 |
| 桥接区 | 20 | ||
| 环岛 | 30 | ||
| 支线 | 40 | ||
| 孤岛 | 50 | ||
| 边缘区 | 70 | ||
| 孔隙 | 90 | ||
| 背景 | 100 | ||
| 与道路的距离/m | [0, 100) | 200 | 0.0874 |
| [100, 200) | 140 | ||
| [200, 300) | 90 | ||
| [300, 400) | 50 | ||
| [400, 500) | 20 | ||
| ≥500 | 10 | ||
| 距居民点距离/m | ≥2000 | 10 | 0.120 |
| [1500, 2000) | 20 | ||
| [1000, 1500) | 40 | ||
| [500, 1000) | 70 | ||
| <500 | 110 | ||
| 与水体的距离/m | [0, 100) | 10 | 0.1544 |
| [100, 200) | 20 | ||
| [200, 300) | 40 | ||
| [300, 400) | 70 | ||
| [400, 500) | 110 | ||
| ≥500 | 160 |
注:NDVI为归一化植被指数;MSPA为形态学空间格局分析。 |
表2 2000—2030年银川市中心城区标准差椭圆参数变化统计Tab. 2 Statistics of standard deviation ellipse parameters in the central urban area of Yinchuan City from 2000 to 2030 |
| 参数 | 2000—2005年 | 2005—2010年 | 2010—2015年 | 2015—2020年 | 2020—2030年 |
|---|---|---|---|---|---|
| 椭圆长轴增减/km | 0.48 | 0.67 | 0.63 | 0.09 | 0.58 |
| 椭圆短轴增减/km | -0.12 | 0.18 | -0.56 | 0.04 | 0.04 |
| 直线距离/m | 940.57 | 125.19 | 446.14 | 911.66 | 200.21 |
| 重心迁移方向 | 东南方向 | 西南方向 | 西南方向 | 西北方向 | 东北方向 |
表3 优化前后的生态网络连接度指标比较Tab. 3 Comparison of ecological network connectivity indicators before and after optimization |
| 指标 | 2000年 | 2010年 | 2020年 | 2030年 |
|---|---|---|---|---|
| α指数 | 0.14 | 0.16 | 0.23 | 0.55 |
| β指数 | 1.21 | 1.26 | 1.38 | 1.89 |
| γ指数 | 0.44 | 0.45 | 0.50 | 0.71 |
表4 生态网络多样性及传播性Tab. 4 Diversity and transmissibility of ecological networks |
| 指标 | 2000年 | 2010年 | 2020年 | 2030年 |
|---|---|---|---|---|
| 网络传播性 | 0.32 | 0.37 | 0.40 | 0.41 |
| 网络多样性 | 1.25 | 1.52 | 1.54 | 1.58 |
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