2000—2020年阿克苏河流域土地利用时空变化图谱分析

Atlas of Spatial and Temporal Changes of Land Use in the Aksu River Basin During 2000–2020

基于2000—2020年阿克苏河流域Landsat遥感影像以及DEM数据,运用图谱理论探究其土地利用时空演变特征及规律。结果表明:(1)2000—2020年阿克苏河流域耕地呈扩张趋势,扩张面积为2951.58 km^(2),主要从草地、未利用地流入,在原有耕地内部及四周扩张,2015年后面积基本保持稳定;(2)建设用地呈现扩张趋势,扩张面积为206.84 km^(2),主要从耕地流入,在原有建设用地的基础上向四周扩张,2015年后面积基本保持稳定;(3)水域呈萎缩趋势,萎缩面积为1653.89 km^(2),主要流出为未利用地和草地,在温宿县冰川积雪处萎缩幅度最大,2015年后有所增长。总体来看,研究区由耕地开垦、建设用地增长的发展模式开始向兼顾生态文明建设的可持续发展方向转型,各主要地类的变化也由急剧发展转向基本可控。

According to the atlas theory,this study explored the spatial and temporal evolution characteristics and patterns of land use in the Aksu River Basin based on the Landsat remote sensing images and DEM data from 2000 to 2020.The results were as follows.(1)During 2000–2020,the cultivated land in the Aksu River Basin was expanding within and around the existing cultivated areas,mainly from grasslands and unused land,with an expansion area of 2951.58 km^(2),and the area remained basically stable after 2015.(2)The construction land presented an expansion trend around the existing construction land,mainly from cultivated land,with an expansion area of 206.84 km^(2),and the area remained basically stable after 2015.(3)The water area showcased a narrowing trend and mainly developed into unused lands and grasslands,with a reduction area of 1653.89 km^(2),which was the largest at the glacier and snow areas of Wensu County.The water area showed a growing trend after 2015.Overall,the land use in the Aksu River Basin was transitioning from a model of expanding cultivated land and construction land to a sustainable development model with consideration to ecological progress.The rapid changes of the main land types became basically controllable.