Key Laboratory for Digital Land and Resources of Jiangxi Province, East China University of Technology, Nanchang 330013, China.
Faculty of Geomatics, East China University of Technology, Nanchang 330013, China.
Ying Yong Sheng Tai Xue Bao. 2023 Mar;34(3):733-741. doi: 10.13287/j.1001-9332.202303.022.
With the rapid development of urban construction, land for construction continues to expand and the ecological land is shrinking. There are various risks and degradation phenomena. The evaluation of urban ecological resilience thus becomes particularly important. From the perspective of urbanization-induced landscape changes, we evaluated the ecological resilience level of Nanchang from 2005 to 2020 by means of "risk-connectivity-potential" model, spatial autocorrelation model and kernel density assessment, as well as its spatial-temporal variations. The results showed that from 2005 to 2020, the spatial pattern of risk, connectivity, and potential subsystems in the study area was stable, with significant differences. The ecological risk was high in the middle and low in the east and west, while the spatial distribution of connectivity and ecological potential was opposite to the ecological risk, showing a pattern of low in the middle and high in the east and west. The overall level of ecological resilience was not high, with medium and low resilience levels as the main body. The low level continued to grow, and high value areas gradually decreased. The "high-high" cluster type of ecological resilience was decreasing, while the "low-low" cluster type was gradually increasing. Results of Kernel density assessment showed that the overall resilience level of Nanchang had little change, with obvious spatial difference. The number and distribution of different landscape types should be adjusted according to the characteristics of the ecological resilience level of different regions, in combination with the urban planning layout. The connectivity and agglomeration of spatial distribution of different landscape types should be changed to achieve the optimization and improvement of the overall regional ecological resilience level. The results could provide a theoretical basis for urban spatial planning and layout.
随着城市建设的快速发展，建设用地不断扩张，生态用地不断缩减，存在各种风险和退化现象，城市生态系统韧性评价显得尤为重要。本研究从城市化诱导的景观格局变化视角出发，采用“风险-连接性-潜力”模型、空间自相关模型和核密度评估等方法，对南昌市 2005—2020 年生态系统韧性水平进行了评价，并分析了其时空分异特征。结果表明：2005—2020 年，研究区风险、连接性和潜力子系统的空间格局较为稳定，差异性显著；生态风险呈现“中间高、东西低”的分布特征，连接性和生态潜力呈现“中间低、东西高”的分布特征，且生态风险和连接性空间分布相反，与生态潜力空间分布一致；整体生态系统韧性水平不高，以中低水平韧性为主，低值区不断扩大，高值区逐渐减少；“高高”集聚类型的生态韧性逐渐减少，“低低”集聚类型逐渐增加。核密度评估结果表明，南昌市整体生态韧性水平变化不大，但存在明显的空间差异，应根据不同区域的生态韧性水平特征，结合城市规划布局，调整不同景观类型的数量和分布，改变不同景观类型的空间分布连接性和集聚性，以实现整体区域生态韧性水平的优化提升。研究结果可为城市空间规划布局提供理论依据。
