Vegetation coverage change trends and their topographic effects in the karst region of western Guangxi
Based on MODIS satellite remote sensing data and the Digital Elevation Model(DEM)from 2000 to 2020,this study investigates the spatial variations of vegetation change in terms of elevation,slope,and aspect in the Baise region of the karst region of the western Guangxi using trend analysis and topographic effect methods.The results show that:(1)the overall condition of Baise's vegetation coverage is in good condition.It is dominated by medium vegetation cover(59.19% )and medium-high vegetation coverage(37.71% ),both of which have obvious changes in area,with the area of the former decreasing by 33.2% and the area of the latter increasing by 29.8% .The area of medium-low vegetation cover is only 2.10% .(2)There is obvious influence of topographic factors on the vegetation ecology of karst areas in western Guangxi.In flat areas with low elevation and moderate slopes,as well as steep areas with high elevation and steep slopes,the change of vegetation cover tends to decrease.In contrast,there is a noticeable increase in vegetation covering in regions with moderate elevation and slopes of 2°～15°.In the terrain transitioning from shady slopes to sunny slopes,the recovering tendency of the vegetation cover is increased,but it shows a relatively more moderate in magnitude.
万方数据
维普
