基于RUSLE的祖厉河上游会师流域土壤侵蚀及敏感性分析

Soil erosion and sensitivity analysis in Huishi watershed of Zuli River Upper Reaches based on RUSLE

为进一步探究祖厉河流域侵蚀状况,以祖厉河上游会师流域为研究区,采用RUSLE模型,结合ArcGIS技术,定量和定性分析了土壤侵蚀和侵蚀敏感性特征。结果表明:祖历河上游会师流域主要以微度和轻度侵蚀为主,占总面积的92.49%;土壤侵蚀敏感性主要为低度敏感,面积为482.14 km2,占研究区总面积的49.00%,总体敏感性较低;坡度5°以上区域土壤侵蚀及其敏感性逐渐增强,且随着坡度增大,土壤侵蚀加剧;在坡耕地、裸地及未采取有效措施的建设用地土壤侵蚀及敏感性较高;土壤侵蚀敏感性较高的地区,土壤侵蚀强度相对较大。研究结果可为流域土壤侵蚀的预防治理、土地利用规划和水土保持措施的布设等提供科学的依据。

In order to further explore the erosion status of the Zuli River basin, the RUSLE model and ArcGIS technology were used to quantitatively and qualitatively analyze the characteristics of soil erosion and erosion sensitivity. The results showed that slight erosion and mild erosion were dominant in Huishi watershed,accounting for 92. 49% of the total area. Soil erosion sensitivity was mainly low sensitivity, with an area of 482. 14 km2,accounting for 49. 00% of the total area of the study area, and the overall sensitivity was low. Besides, the soil erosion and its sensitivity in the slope above 5° increased gradually, and the soil erosion intensified with the increase of the slope.The soil erosion and sensitivity of sloping farmland, bare land and construction land without effective measures were higher. The intensity of soil erosion was relatively greater in areas with high sensitivity to soil erosion. The results can provide scientific basis for soil erosion prevention and control,land use planning and soil and water conservation measures.