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农林复合生态系统具有改善土壤水分状况的功能；能够提高土壤水分利用效率，棉花提高１５．６％，玉米提高１６．１％，小麦提高１５．２％；土壤湿度具有明显的季节性变化，以６月份为最低，７月份为最高，在作物各个生育阶段，系统内均高于系统外；在作物生育期内，土壤总耗水量，系统内较系统外低７％左右。用逐步回归方法研究表明：影响系统内外农田耗水量的主要因素是动力因素，系统内湍流交换减弱造成了农田耗水量减少。
The agroforestry ecosystem has the function of improving the soil water status; it can improve the water use efficiency of the soil, with the increase of 15.6% for cotton, 16.1% for maize and 15.2% for wheat; the seasonal variation of soil moisture The lowest in June and the highest in July. The system was higher than the system in all stages of the crop’s growth stage. During the crop growth period, the total soil water consumption within the system was about 7% lower than that outside the system. The results of stepwise regression analysis show that the main factor affecting the water consumption in farmlands both inside and outside the farmland is the dynamic factor, and the weakened exchange of turbulent flow in the farmland leads to the reduction of farmland water consumption.