摘要
根据43个径流小区资料,用主成分分析和回归分析方法,得到计算长江三峡区紫色土坡耕地土壤流失量的回归方程: y=20.3x_1+249.5x_2-2.5x_3-2017.2 用此方程计算遂宁组区、蓬莱镇组区、自流井组区和沙溪庙组区紫色岩的土壤流失量分别为:4116、3464、2985和1848t/km^2·a。对自流井岩组的土壤流失量按月计算,并分析各观测资料发现:全年中夏季最大月土壤流失量,占年总流失量50％～70％,其中一次降雨产生的最大土壤流失量,占全年总流失量25％～45％。抓住关键月、关键次降雨对防治土壤侵蚀有重要意义。
The regression equation for calculating soil loss in slope land with purple soil in the Yangtze Three-gorge region was obtained by using the principal component and regression analytical methods based on the informationl from 43 runoff experimental plots: Y=20.3X_1+249.5X_2-2.5X_3-2017.2 The equation is used to calculate purple soil loss in the following groups respectively: J_2sn rock group 4116 t/km^2·a; J_3P rock group 3464t km^2·a; J_(1-2)z rock group 2 985 t/km^2·a and J_2S rock group 1848 t/km^2.a; Soil loss in J_(1-2)z rock group wascalculated according to months.It wasvfound through the analysis of observed and measured data that the maximum month soil loss in summer accounted for 50%～70% of total yearly soil loss, of which the maximum soil loss produced in one rainfall accounted for 25%～45% of total yearly soil loss. Accordingly, it is very important to take measures to control soil loss in the key month and key rainfall period.
出处
《水土保持学报》
CSCD
北大核心
1991年第3期36-44,共9页
Journal of Soil and Water Conservation
关键词
紫色土
坡耕地
土壤
流失量
principal component analysis purple soil soil loss
