基于RS与GIS的定西市安定区土地利用变化与土壤侵蚀研究

Landuse changes and soil erosion in Anding Region,Dingxi City of Gansu Province based on RS and GIS

利用1993年和2005年两期的遥感影像数据,在GIS软件支持下,计算了定西市安定区的植被覆盖度和土地利用类型;利用栅格数字高程模型DEM,计算安定区的地表坡度,最终对安定区的土壤侵蚀进行分级。定量分析了定西市安定区的土地利用及土壤侵蚀的时空动态特征,研究结果表明:12年来林草地、建设用地、水域面积增加,其中林草地和建设用地增幅最大;耕地和未利用地总量明显减少。耕地、林草地和未利用地之间的转化最为显著。12年来研究区水域的稳定性较高,其余类型的稳定性较低,耕地和未利用地大量耗减,林草地和建设用地被大幅度开发。

Based on translated data from remote sensing images in 1993 and 2005,under the help of GIS software,the vegetation coverage and landuse plan in Anding region of Dingxi City was calculated by means of remote sensing image.The land slope in the region was computed by raster Digital Elevation Model（DEM） and the soil erosion was graded.The results indicated that the area of forest and grassland,build land had increased significantly and water region increased slightly,arable land and unused land had decreased greatly.The changes among arable land,forest land and grassland and unused land were the most significant.Water region was more stable,the other types changed greatly.The arable land and unused land were depleted largely,and forest land and grassland and build land were sharply exploited.