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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 the remote sensing image data of 1993 and 2005, the vegetation coverage and land use types of Anding District in Dingxi City were calculated with the support of GIS software. Using the grid digital elevation model DEM, the slope of the land in the stable area was calculated. Finally, Soil erosion in the stable area is graded. The spatial and temporal dynamic characteristics of land use and soil erosion in Anding district of Dingxi city were quantitatively analyzed. The results showed that: the area of forest and grassland, construction land and water area increased in 12 years, of which forest grassland and construction land increased the most; the cultivated land and unutilized land obviously decrease. The most significant transformation is between arable land, grassland and unused land. In the past 12 years, the stability of the waters in the study area was relatively high, the stability of the remaining types was low, the cultivated land and the unutilized land were drastically reduced, and the forest and grassland and construction land were greatly exploited.