福建省长汀县水土流失地形因子影响分析

Impact Analysis on the Soil Erosion Topographical Factor in the Changting County of Fujian Province

以长汀县为研究区域，应用AreGIS软件空间分析功能，分析长汀县不同高程、坡度、坡向的水土流失分布特征，分析水土流失成因。研究结果显示，长汀县53．41％的水土流失主要分布在高程300—400m的地带，15—25°和8—15°坡度地带水土流失面积分别占水土流失总面积的36．68％和34．90％，60．89％的水土流失集中在高程300—500m、坡度5～25°区域，不同坡向水土流失分布情况基本上与阳坡、阴坡分布相一致。

By using the space analysis function in the ArcGIS software, it was studied the soil erosion distribution characteristics at different elevations, slope degrees and directions in Changting County, so as to analyze the cause of the soil loss. The results show that, 53.41% soil erosion of ChangtingCounty is located at the regions with the elevation of 300 to 400 m. The soil erosion areas at the regions with the slope degrees of 15 -25° and 8- 15° accounts for 36.68% and 34.90% respectively in the total soil erosion area. 60.89% soil erosion is located at the regions with the elevation of 300 -500 m and slope degree of 5 - 25°. Soil erosion distribution at different slope directions is in accordance with the distribution at sunward aspect and shady aspect slopes.