小江流域土地利用格局变化及驱动因素分析

为了探讨小江流域各种土地利用类型的数量变化和土地利用动态变化规律,运用遥感和地理信息系统技术,分析了1974-2005年小江流域土地利用类型变化幅度、速度及土地利用程度。结果表明:30多年来,小江流域耕地和城乡工矿用地面积均显著增加,林地面积表现出先减少后增加的趋势,草地面积相对变化不大,未利用土地面积研究期间共减少12.9km2;小江流域土地利用变化总体速度在下降,1974-1987年土地利用变化最剧烈;同时研究区土地利用程度一直在增加,表明小江流域土地利用仍然处于发展期。小江流域土地利用变化深受该地区历史原因、人口增长以及政策因素等方面的影响。

Analysis of Land Use Change and Driving Factors in Xiaojiang Basin

In order to investigate the quantity change of each land-use type and land-use dynamic variation,the techniques of remote sensing and geographic information system was applied to study land use change during 1974-2005,such as land-use change range and rate,land-use degree.The results were as follows:the area of farmland,and urban and rural industrial land increased quickly from 1974 to 2005,the area of woodland declined from 1974 to 1995 and increased after 1995,the grassland area relatively changed little,and the area of unused land always decreased 12.9 km2 during 31 years.Land-use changing speed continually declined as a whole inXiaojiang Basin and the land use changed quickly during 1974-1987.Meanwhile,the land-use degree increased at all times,suggesting land use was still in its development phase.In this area,the land use change was predominantly affected by some factors,such as historical factor,population and policy etc.