三、定水位条件下非均质土的稳定蒸发 稳定蒸发条件下,非均质土层中土壤水分的运动有以下两个特点: 第一、地下水面以上,通过各层土的土壤水流量应相等,并等于表层土壤水的蒸发强度。即 Under steady water conditions, the stable evaporation of heterogeneous soil Under the condition of steady evaporation, the movement of soil moisture in the heterogeneous soil has the following two characteristics: First, the soil water flow through the soil above the groundwater level should be Equal, and equal to the evapotranspiration of surface soil water. which is