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根据系统实测资料，利用根层土壤水的变化量，按水量平衡公式反算求得观测年、季及旱月的土壤蒸散量.以三年平均及旱年土壤吸入水量减去蒸散量的结果显示，两个观测试区0～100cm土层蒸散量大于吸入水量；若以月平均计，则每月蒸散量大于土壤吸入水量3．84～8．60mm，土壤水的吸入略小于消耗，一年内土壤水量接近平衡．
According to the measured data of the system, the amount of soil evapotranspiration of the annual, seasonal and dry months was calculated by the variation of root soil water and the water balance equation, The results show that the evapotranspiration of 0 ~ 100cm soil layer in two observation areas is larger than that of inhaled water. If monthly average, the monthly evapotranspiration is more than 3.84 ~ 8.60mm, soil water intake is slightly less than consumption, Soil water balance during the year.