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东北西部干旱、半干旱地区影响农业、畜牧业发展的关键因子之一是水分。水分在这一地区变化规律是５～６月春旱阶段，７．８、９三个月是土壤水分丰盛期，各层次水分相差不大，１０月至来年２月是土壤储水期。农田防护林的建立减少了蒸发，提高了土壤水分。但距林带不同距离调节水分幅度不同，明显出现水分最佳区和水分低谷区。根据这一规律可以调整种植结构，充分合理的利用土壤水分，为推广节水型农业提供了途径。防护林带的种类、树高、树种及林带间的距离对林网内水分的分配都有较大影响，这一结论为防护林体系的优化提供了科学依据。
One of the key factors affecting the development of agriculture and livestock husbandry in the arid and semi-arid regions of the western Northeast China is moisture. The variation of water in this area is the spring drought period from May to June, 7.8 and 9 months are the soil moisture rich periods, and the water in each layer is not much different. The soil water storage period from October to February is the next year. The establishment of farmland shelterbelts reduces evaporation and increases soil moisture. However, different distances from the forest to adjust the water range, obviously the best water area and low water area. According to this law, the planting structure can be adjusted, and the soil water utilization is fully and rationally provided, which provides a way to promote water-saving agriculture. The species of shelterbelts, the height of trees, the distance between tree species and forest belts have a significant impact on the distribution of water in the forest network. This conclusion provides a scientific basis for the optimization of shelterbelts.