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运用土壤—植物—大气水分传输理论，建立农林复合模式的土壤分层水量平衡模型。主要公式有：土壤蒸发与植被蒸腾、林木与小麦根系吸水、土壤层次间的水分交换及植被冠层截留量等水分要素的计算。模型的求解采用数值计算法，并利用０～２００ｃｍ土壤容积含水量的实测值进行验证。研究表明：可以利用所建立的模型，模拟计算林带与小麦根系吸水量、林带与农田蒸散耗水量、林带影响农田土壤水分范围与程度。
Soil-plant-atmosphere moisture transfer theory was used to establish a model of soil stratified water balance based on the agroforestry model. The main formulas are: soil evaporation and vegetation transpiration, forest and wheat root water absorption, soil moisture exchange between the layers and vegetation canopy interception and other water elements calculation. The model is solved numerically and validated with measured values of soil moisture content from 0 to 200 cm. The results show that the model can be used to simulate the water absorption of root zone and wheat root system, the water consumption of transpiration in forest zone and farmland, and the range and extent of soil moisture in farmland.