降雨强度对土壤水再分布的影响

Effects of rainfall intensity on soil water redistribution

为了研究降雨强度对降雨入渗土壤后的水量分布规律,对不同降雨强度下坡耕地0～100 cm土壤含水量消退过程进行了分析。结果表明:降雨入渗后表层土壤含水量急剧增加,土层越深,变化幅度越小;随着停渗时间的延长,上层土壤含水量明显减小,下层土壤含水量稳定增加;降雨强度越大,转化成土壤水的水量越多,停渗后表层水分损失就较少;土壤水变化幅度越小,土壤水消耗过程越短,土壤水再分布影响的土层越深。

We analyze the declining process of soil moisture in 0~100 cm soil layer in a sloping farmland under different rainfall intensities.The results show that the surface soil moisture increases dramatically after rainfall infiltration,and the variation magnitude becomes smaller with the increase of soil layer depth;the upper soil moisture significantly reduces and the lower soil moisture steadily increases with the extension of the stop-infiltration time.The heavier the rainfall intensity is,the larger the amount of water enters into the soil,and the less the surface soil moisture losses after the infiltration stops;the smaller the magnitude of soil water variation is,the shorter the consuming process of soil water is,and the deeper the soil layer is affected by soil moisture redistribution.