室内模拟降雨条件下土壤水分入渗及再分布试验

降雨入渗对城市绿化、防洪排涝、农业生产等方面有着重要的意义。采用室内模拟降雨，使用时域反射仪采集相关数据，从土壤含水率变化特征和湿润锋运移特点等方面，研究了在垂向一维条件下不同雨强降雨对水分入渗的影响，探讨在降雨条件下土壤水分的再分布情况，从而确定试验所用砂壤土保水性最优土层范围。结果表明：降雨结束后，土壤水分的再分布主要受土水势控制，随着时间的延长，蒸发作用逐渐占据主导地位；试验所用砂壤土的最佳保水性土层深度为20～35 cm，可为植物的选栽提供参考。

Experiment on process of soil water infiltration and redistribution under simulated rainfall

Rainfall has a significant meaning in urban afforestation, flood control, drainage and agricultural production. The experiment used artificial simulation of rainfall indoor to collect soil moisture content data through TDR. The influence of different rainfall intensity on water infiltration in vertical one-dimensional was investigated to understand the characteristics of soil moisture migration and wetting front movement and soil moisture redistribution in the rainfall condition and than to find ont the optimal soil depth scope for water preservation. The results showed that after the rain, soil moisture re-distribution is mainly controlled by soil water potential at the beginning, but it becomes dominated by evaporation with the time. The research showed that the optimal water preserving capability layer in sandy loam soil used in the experiment is between 20-35 cm.