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基于天然降雨径流小区,动态监测了澄江抚仙湖一级支流尖山河小流域坡耕地降雨-径流过程及水土流失量,研究了反坡水平阶对云南红壤坡耕地水土流失的调控作用.结果表明:反坡水平阶对研究区地表径流调控率在49.5%～87.7%,产沙调控率在56.7%～96.1%,平均可削减地表径流65.3%、减少泥沙流失80.7%,产流产沙调控作用显著,且产沙调控作用更明显;原状坡面和反坡水平阶处理中各参数的变异系数均依次为:泥沙流失量>径流量>产径流降雨量.与原状坡面相比,反坡水平阶处理下径流量、泥沙量的相对偏离程度较小,说明反坡水平阶对研究区坡耕地水土流失调控作用显著.
Based on the natural rainfall runoff plots, the rainfall-runoff process and soil erosion on sloping farmland in Jianshanhe watershed, a tributary of Fuxian Lake, was dynamically monitored, and the regulation of the level of reverse slope on the soil and water loss on sloping farmlands of red soil in Yunnan Province was studied. : The horizontal slope of the reverse slope can control the rate of surface runoff in the study area from 49.5% to 87.7% and the control rate of sediment yield from 56.7% to 96.1%, with an average reduction of 65.3% of the surface runoff and the reduction of sediment loss by 80.7% And the control effect of sediment yield was more obvious. The coefficients of variation of each parameter in the original slope and the reverse slope were: sediment loss> runoff> runoff rainfall. Compared with the original slope, The relative deviation of runoff and sediment yield under horizontal level treatment is small, which shows that the horizontal level of reverse slope has a significant effect on the control of soil erosion on sloping farmland in the study area.