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以青海省乐都县、互助县6条侵蚀沟为研究对象,收集了研究区域的降雨、地形地貌、植被、土壤等数据,系统分析了各因子与土壤侵蚀量的关系。结果表明,该研究区域年侵蚀厚度与年降雨总量的变化规律不明显,土壤容重、植被覆盖度和坡度三个因子的共同作用对侵蚀量有显著的影响。区域内各影响因子对土壤侵蚀影响的大小排序为:植被盖度>坡度>土壤容重>土壤可蚀性>降雨侵蚀力,再次说明退耕还林(还草)工程能够有效改善区域水土流失问题。
Taking 6 erosion ditches in Ledu County and Huzhu County of Qinghai Province as the research object, we collected the data of rainfall, topography, vegetation and soil in the study area and systematically analyzed the relationship between each factor and soil erosion. The results show that the variation of annual erosion thickness and total annual rainfall is not obvious in this study area. The combined effect of soil bulk density, vegetation coverage and slope has a significant impact on the erosion amount. The order of impact of various influencing factors on soil erosion in the region is: vegetation cover> slope> soil bulk density> soil erodibility> rainfall erosivity, which shows again that the project of returning farmland to forest can effectively improve the problem of soil erosion.