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本试验采用二次止交旋转回归组合试验设计方法,研究了地面坡度、平均降雨强度、暴雨雨型、水土保持措施和植被覆盖度对降雨入渗的影响,经分析,已得到两个描述与入渗结果有关的多维反应面回归方程。试验表明,坡耕地上实施水土保持措施对拦蓄降雨,增强入渗有显著效益。在供试的几种水土保持措施中,以水平梯田效果最佳,其次为隔坡梯田,再次为水平沟种植。在59～70min 时间内,降水80～90mm,基本上能全部就地拦蓄入渗,不发生径流。随着地面坡度和平均降雨强度的增大,发生径流或者蓄水超渗的起始时间提前;增加农田植被覆盖,将有利于拦蓄降雨,增大入渗,保护土壤;随着降雨雨型的变化,土壤入渗速率依时间变化曲线与常态有压入渗时迥然不同。
In this experiment, the second experiment was conducted to study the effect of rainfall gradient on the rainfall infiltration by using the method of the second stop rotation rotation regressive combination test. The effects of slope gradient, mean rainfall intensity, rain storm type, water and soil conservation measures and vegetation coverage on rainfall infiltration were studied. Infiltration results related to the multidimensional response surface regression equation. Experiments show that the implementation of soil and water conservation measures on sloping fields has significant benefits on interception of rainfall and enhancement of infiltration. Among the tested soil and water conservation measures, horizontal terraced fields are the best, followed by terraced terraced fields and once again horizontal ditches. In 59 ~ 70min time, precipitation 80 ~ 90mm, basically all in place to stop the infiltration of infiltration, runoff does not occur. With the increase of ground slope and average rainfall intensity, the onset time of runoff or water infiltration is advanced. Increasing the vegetation cover of farmland will help to intercept rainfall, increase infiltration and protect the soil. With the increase of rainfall type Change, the rate of soil infiltration rate curve with time under normal pressure infiltration is very different.