2000-2022年乌兰布和沙漠主要植物群落覆盖度时空动态及驱动因素OA

Desert vegetation plays crucial roles in ecosystem stability and desertification control.This study ana-lyzed the spatiotemporal dynamics and driving factors of fractional vegetation cover(FVC)in major plant com-munities of the Ulan Buh Desert using multi-source remote sensing and ground observation data from 2000-2022.Applying Theil-Sen Median trend analysis,Mann-Kendall significance testing,and geographical detector methods,we identified 41 typical plant communities in the Ulan Buh Desert,which were dominated by Nitraria tangutorum(3197.84 km2),Artemisia ordosica(2168.86 km2),and Ammopiptanthus mongolicus-Nitraria tanguto-rum(1055.46 km2)communities.The overall FVC was mainly low to moderate,with distinct interannual periodic fluctuations that were especially intense in 2014-2018.FVC fluctuation amplitude varied significantly among dif-ferent communities,ranging from the most stable Artemisia blepharolepis community(19.13%)to highly fluctuat-ing communities such as Calligonum mongolicum(approaching 100%).Spatially,the interannual FVC changes in the Ulan Buh Desert exhibited significant increases in northeastern and southeastern regions,non-significant de-creases in the central desert hinterland,and alternating increases and decreases in western regions.Spatial differ-entiation was driven primarily by coupled precipitation and hydrological factors(explanatory power up to 0.583).Two-factor interactions generally exceeded single-factor effects,particularly the interactions between precipita-tion-hydrological factors and between precipitation,hydrological,and soil factors.The impacts of human activity on plant community FVC were relatively limited(q≤0.187).