1990-2020年北京市土地沙化时空演变特征及驱动因子分析OA

[Objective]The aim is to deeply explore the spatiotemporal distribution patterns and driving mechanism of land desertification in Beijing,which is essential for formulating effective policies for preventing and controlling desertification and promoting ecological sustainability.[Method]Based on 7 phases of Landsat images from 1990 to 2020,a feature space was constructed using surface albedo(Albedo)and the normalized difference vegetation index(NDVI).Combined with desertification difference index and geographic detector model,the spatial distribution characteristics and key driving factors of land desertification in Beijing were revealed.[Result]From 1990 to 2020,the desertified land in Beijing was primarily distributed in plains and riparian areas,and decreased significantly by approximately 33 000 hm2.Among different land use types,t he degree of desertification in forest land was severe.The geographic detector analysis showed that land desertification was driven by both natural and anthropogenic factors,with population density being a key driving factor.[Conclusion]Land desertification situation in Beijing has significantly improved in 1990-2020,but there are still some desertified areas that require further restoration.Future management strategies should include rational regulation of population density,the focus on vegetation construction along rivers,and protection of cultivated land.Various measures such as soil and water conservation and afforestation should be taken comprehensively to further curb the expansion of land desertification.