本文着重研究了毛乌素沙地不同防护林带的水文效应问题,包括气候生态和社会经济效益、水文效应和水量平衡等问题的研究和分析。沙地林带的增产机理,主要是减低风速,固土保水,减少水面蒸发,增加降水,提高空气和土壤的湿度。效果最好的林带是乔灌混交林,其次是乔木林,灌木林仅次于乔木林。耗水量最大是混交林,最小的是灌木林,介于二者之间的是乔木林。 This paper focuses on the hydrological effects of different shelter belt in the Mu Us sandy land, including the research and analysis of the climatic, ecological and socio-economic benefits, hydrological effects and water balance. The production mechanism of sandy land belts is mainly to reduce wind speed, stabilize soil and water, reduce evaporation of water surface, increase precipitation, and increase the humidity of air and soil. The best forest belt is mixed forest of shrubs, followed by arbor forest, shrub forest second only to arbor forest. Water consumption is the largest mixed forest, the smallest is shrubs, between the two is the arbor forest.