艾比湖流域近40年来土地利用与覆被动态变化研究

土地利用与覆被变化(LUCC)是全球环境变化的研究焦点,定量评估土地利用变化对区域土地资源可持续利用具有重要意义。选择干旱区典型代表区域———新疆自治区艾比湖流域为研究区,基于1970年和2009年2期的LUCC数据,利用数学模型和ArcGIS分析了艾比湖流域1970—2009年近40 a来土地利用与覆被的变化过程。结果表明,在整个研究时段内耕地和城乡建设用地面积在不断增加,其中耕地面积的年平均变化率为5.21%,城乡建设用地为5.62%,其它土地利用类型的面积均减少;耕地和草地、未利用地与草地之间的转化比较明显;城乡建设用地的动态变化最大,水域的动态变化最小;转入贡献率中占优势的主要是未利用地、草地和耕地,转出贡献率占优势的主要是未利用地和草地。

Land Use/Cover Changes of Ebinur Lake Watershed in Recent Forty Years

Land use/cover changes(LUCC) have been regarded as a research hotspot in the field of global environment change.Quantitative evaluation on land use change is of great significance for sustainable utilization of local land resources.The Ebinur Lake watershed in Xinjiang Uygur Autonomous Region,as the study area,is a typical area of arid regions.Based on the LUCC data in 1970 and 2009,we used mathematical models and ArcGIS to analyze the change in land use/cover during this time period.The results show that the areas of cropland and construction land increased constantly from 1970 to 2007,with average annual rate of 5.21% and 5.62%,respectively.Accordingly,the areas of the other land use types decreased.The transformation between cropland and grassland,and between unused land and grassland were significant.The area of construction land experienced maximum changes and the water area minimum.Specifically,unused land,grassland,and cropland received most conversion areas from the other land use types,and unused land and grassland contributed most areas to the other types.