摘要
Abstract
[Objective]This study explores the supply and demand relationship of ecosystem services,constructs and optimizes the ecological security pattern,and provides an important spatial strategy for re-alizing ecosystem health and urban sustainable development.[Method]This study took the Changsha-Zhuzhou-Xiangtan Urban Agglomeration as the research area and adopted,the InVEST model was adopted to construct the ecological security pattern of the area on the basis of evaluating the supply-de-mand matching status of five ecosystem services,including water yield and carbon sequestration.The random forest model was used to identify the key influencing factors of the supply and demand relationship of ecosystem services,and corresponding suggestions for optimizing the ecological security pattern were put forward.[Result](1)From 2000 to 2020,the Changsha-Zhuzhou-Xiangtan Urban Agglomeration exhibited a downward trend in carbon sequestration,habitat quality,and water yield;soil conservation showed a slight increase,while recreational value remained basically stable.The demands for carbon se-questration,water yield,recreation,and habitat quality generally displayed an upward trend,whereas the demand for soil conservation decreased.The comprehensive ecological supply-demand ratio was char-acterized by a spatial pattern of"low in the west and north,high in the east and south".(2)In 2020,a total of 43 ecological sources,94 ecological corridors,115 ecological pinch points and 25 ecological bar-rier points were identified in the study area.(3)The random forest model identified forest land propor-tion,topographic relief,distance to urban areas and GDP as the key factors affecting the supply and de-mand relationship of ecosystem services in the Changsha-Zhuzhou-Xiangtan area.[Conclusion]The Changsha-Zhuzhou-Xiangtan Urban Agglomeration is facing an imbalance between the supply and demand of ecosystem services.On this basis,the ecological security pattern was constructed,and optimization suggestions such as adding new ecological sources,connecting ecological networks,and protecting key ecological strategic points were proposed.The research results provide a reference for the practice and management of ecological protection and restoration in the Changsha-Zhuzhou-Xiangtan Urban Agglomera-tion and offer new ideas for the application of theories and methods of ecological security construction in urban agglomerations.关键词
长株潭城市群/生态系统服务供需/生态安全格局/随机森林Key words
Changsha-Zhuzhou-Xiangtan Urban Agglomeration/ecosystem service supply and de-mand/ecological security pattern/random forest分类
生物科学
