应用非饱和土壤水分运动原理 ,对塑料暗管排水条件下分层土壤的水分运动进行了数值模拟 ,建立了数学模型。结果表明 ,模型计算的土壤水分分布结果和田间实测的土壤剖面水分数据一致 ,应用该模型可以确定出试验区在一定外界气象条件下不同地下水降落速度时农田的受渍情况 Based on the principle of unsaturated soil moisture movement, the water movement of stratified soil under the condition of plastic tube drainage was numerically simulated and a mathematical model was established. The results show that the soil moisture distribution calculated by the model is consistent with the measured soil profile moisture data in the field. The model can be used to determine the stains of farmland under different ambient meteorological conditions at different groundwater landing velocities