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利用研究区地形图制作数字高程模型(DEM),并由DEM提取坡度、坡向图,与土地利用类型、土壤侵蚀强度和抚仙湖历年水质(透明度、TN、TP平均值)等专题信息叠置,提取水土保持专题信息,并对提取结果进行应用分析,以确定抚仙湖流域不同土地利用类型和地形因子与侵蚀类型及侵蚀过程的关系。研究结果表明:抚仙湖的水质和流域的土地利用状况相关,抚仙湖流域土壤侵蚀方式具有明显的垂直分带性,土壤侵蚀强度受到土壤类型和植被覆盖状况的影响。不同坡向的侵蚀强度有明显差异,同时坡度不同是引起土壤侵蚀类型差异的主要因素。
The digital elevation model (DEM) was made by using the topographic maps of the study area. The DEM was used to extract the slope and aspect maps, and the land use types, the soil erosion intensity and the water quality information (transparency, TN and TP average values) over the years in Fuxian Lake The special information of soil and water conservation was extracted, and the application of the extraction results was analyzed to determine the relationship between the types of land use and topographical factors and the types of erosion and the erosion process in Fuxian Lake. The results show that the water quality of Fuxian Lake is related to the land use status in the basin, and the soil erosion pattern in the Fuxianhu Basin has obvious vertical zonation. The soil erosion intensity is affected by soil types and vegetation coverage. There are significant differences in erosion intensity between different slope directions, and different slope degrees are the main factors causing the difference in soil erosion types.