[目的]分析毛鸟素沙地沙柳根系分布特点及土壤水分的关系,进一步确定干旱地区沙柳根系吸水模型.[方法]采用挖掘法对沙柳样地的毛、细和侧根根系分布进行调查研究,使用土壤水分中子仪测量土壤含水率.[结果]沙柳样地毛根根量分布呈现逐渐递减规律,最大值出现在表层20 cm,毛根主要利用表层20 cm以上的土壤水分.细、侧根根量分布呈现先增大后减少规律,最大值出现在100～120 cm土壤深度,细、侧根主要利用100 cm深度上的土壤水分.[结论]沙柳根系生物量总体上逐渐减小,根系分布与土壤水分变化基本符合沙柳吸水规律.%[Objective] The study aims to analyze the relationship of Salix psammophila roots' distribution characteristics and soil moisture in Mu Us Sandy Land, and further defines the bibulous model of Salix psammophila roots in drought areas. [ Methods] Make a study on the dis tribution of hair roots, fine roots and lateral roots in the Salix psammophila sample areas using digging method, meanwhile, measure soil water content using soil moisture neutron instrument. [ Result ] The results show that the number of hair roots in the Salix psammophila sample areas is gradually decreasing, and the maximum appears in the depth of 20 cm of the surface layer, hair roots mainly use the soil moisture above the depth of 20 cm of the surface layer. The distribution of the number of fine roots and lateral roots increases at first, then reduces, and the maxi mum is in the range of 100 - 120 cm, fine roots and lateral roots mainly use the soil moisture in the depth of 100 cm. [ Conclusion] The bio mass of Salix psammophila roots gradually decreases, the roots distribution and the change of the soil moisture are basically accord with the bibulous law of Salix psammophila.
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