中文摘要：

土壤水分腾发量的确定是土壤水分运动研究的难点问题。擘通量面法是利用零通量面存在时段计算土壤水分腾发量的方法。在计算时段内，根据零通量面发育状态不同可分为零通量面稳定条件下的计算公式和零通量面移动条件下的计算公式。选择不同水位埋深、不同作物类型的土壤剖面对计算公式进行了验证，结果表明，零通量面法计算土壤水分腾发量精度较高，简单易行。本方法适用于计算潜水埋深在3～10m的干旱半干旱的平原地区计算土壤水分腾发量。

英文摘要：

The calculation of soil evapotranspiration is a difficulty in studying soil water movement. Zero flux plane method is a method of calculating soil evapotranspiration by zero flux plane during certain period. According to the development condition of zero flux plane, it can be divided into steady condition equation and variation condition equation. These equations are tested by soil profile with different depth of water line and different crops. The results indicate that the zero flux plane method is feasible and its accuracy is favorable. This method is suitable for calculating soil evapotranspiration in arid and semi-arid plain areas where the depth of water line is between 3 m to 10 m.