绿化样板淳化县水土流失的成因分析

A preliminary study on loss of soil and water in Chunhua County, Shaanxi Province

本文以野外调查和室内图面量算获得的资料数字为依据,分析了有限范围内小流域土壤侵蚀的成因,并以函数关系式E=f(J·ρ·C·S)表示土壤侵蚀与侵蚀诸因子间的关系。通过各因子与侵蚀模数的单因子相关分析,发现地形比降、侵蚀沟密度、活动沟头数、坡面被覆、流域面积与其关系密切,而林地被覆、塬面治理度则相反。寻其原因,主要是由于当前各种水土保持措施数量少、标准低、质量差、不配套等造成的。

On the basis of data obtained from field investigation and the meas-urement of topographical map, the present paper dealt with the originof soil erosion in a certain small watershed in Chunhua Model County.The relations among soil erosion and erosion causes are shown by the for-mula E= f(J·ρ·C·S). It was found by relation analysis among erosive mo-dulus and erosion causes that topographic grade, channel frequency, thenumbers of active gully head, the vegetation coverity of slope, and thesize of watershed area had close relations to erosive modulus. However,the forest coverage and the level of Yuanmian control did not have closerelation to erosive modulus. It was considered that those results werecaused by few measurements, low level, poor quality, nonorganizationsystem of soil and water conservation practices nowadays in the area.