Analysis of ecological environment evolution and driving forces in a karst rocky desertification area
In this study,using remote sensing methods,we analyzed the evolution of ecological environment quality from 2000 to 2020 in Yanshan County,a typical rocky desertification area in southeastern Yunnan Province.Based on this analysis,we examined the primary driving factors affecting changes in the local ecological environment,thereby aiming to develop a method for the quantitative evaluation of ecological environments in rocky desertification areas.Using Landsat data obtained from the Google Earth Engine(GEE)platform,a remote sensing ecological index(RSEI)of the study area from 2000 to 2020 was constructed.The influence of the main driving factors on the quality of the ecological environment were quantified using a geographical detector.The results revealed that the mean values of RSEI in Yanshan in 2000,2010,and 2020 were 0.46,0.44,and 0.57,respectively.Furthermore,from 2000 to 2020,there was a 57.28%improvement in the quality of the ecological environment,characterized by an initial decline followed by a subsequent rise.Additionally,we detected an overall decline in rocky desertification in Yanshan in 2000,2010,and 2020,with a reduction of 1 181.77 km2 in the area of rocky desertification.Moreover,rocky desertification and land-use change were identified as the main driving factors of the ecological environment from 2000 to 2020,with rocky desertification being found to have the strongest explanatory power for determining the evolution of ecological environment quality.Overall,we established that the quality of the ecological environment in Yanshan County gradually improved from 2000 to 2020.From the perspective of ecological environment management,we should pay greater attention to the influence of karst rocky desertification and land cover type stability.
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