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文章将流域最小可能土壤侵蚀模数与实际土壤侵蚀模数的比值定义为流域侵蚀控制度,并以王茂沟流域为例说明计算方法。结果表明:王茂沟流域水土保持措施容量下的流域最小可能土壤侵蚀模数为2 573 t/(km2.a);使用王茂沟流域2004年土地利用图,计算得出王茂沟流域实际土壤侵蚀模数为7 413 t/(km2.a),王茂沟流域侵蚀控制度为0.35,造成王茂沟流域2004年流域侵蚀控制度较低的原因是王茂沟流域还存在一定数量的坡耕地以及林地面积较少。建议将流域侵蚀控制度作为评价流域水土保持现状的指标。
In this paper, the ratio of the smallest possible soil erosion modulus to the actual soil erosion modulus is defined as the basin erosion control degree. The calculation method is illustrated by taking Wangmaogou watershed as an example. The results showed that the minimum possible soil erosion modulus of Wangmaigou watershed was 2 573 t / (km2.a). The land use map of Wangmaogou watershed in 2004 was used to calculate the actual The soil erosion modulus is 7 413 t / (km2.a), and the erosion control degree of Wangmaogou basin is 0.35, which causes the lower degree of erosion control in Wangmaigou watershed in 2004 because there is a certain amount of Slope farmland and forest land area less. It is suggested that the degree of basin erosion control be used as an indicator to evaluate the current status of soil and water conservation in the basin.