Landscape ecological risk assessment and driving factors analysis in the Three River Source Region from 2000 to 2020
The Three River Source Region is a crucial source and catchment area,and its ecological security is vi-tal.Investigating the spatial and temporal variations of landscape ecological risks and their drivers in this region is essential for promoting ecological security and the sustainable development of water resources in Southeast Asia.In this study,we focused on the Three River Source Region and constructed an evaluation model using land use data from the fifth phase to analyze the spatial and temporal characteristics and trends of landscape ecological risk.We employed a parametric optimal geodetector to compare and analyze the driving factors behind the spatial variation of landscape ecological risk at both global and local scales.The results revealed the following:(1)From 2000 to 2020,the study area exhibited a significant positive correlation with landscape ecological risk,particular-ly within the medium-and medium-low-risk areas,with areas classified as high-risk.(2)From 2000 to 2020,the landscape ecological risk in the study area improved,with high-and low-risk areas transitioning into predominant-ly medium-low,medium-and medium-high-risk areas.The Lancang River source exhibited a slightly higher risk level than the Yangtze and Yellow River sources.(3)The area and fragmentation degree of landscape types were identified as key determinants of landscape ecological risk variations in the region,with spatial differentiation re-sulting from the combined influence of multiple driving factors.Among these,Normalized Difference Vegetation Index(NDVI),elevation,and slope were identified as the primary driving factors,with their impacts varying sig-nificantly across terrain.To ensure ecological integrity and sustain ecological functions,the government should prioritize the protection and monitoring of snow-capped glaciers,implement measures to curb grassland desertifi-cation,and prevent the resurgence of ecological risks.
landscape ecological riskdriving factorsOptimal Parameter Geographic DetectorThree River Source Region
国家科技期刊平台
NSTL
万方数据
