中文摘要：

在毛乌素沙地南缘选择不同栽植密度（0.2、0.6株/m2和0.8株/n2）的沙柳人工灌丛,对沙柳生长特征及土壤水分进行研究.结果表明：不同栽植密度沙柳的生长特征存在显著差异,沙柳株高、平均冠幅直径、地上生物量、叶片生物量和茎生物量随着栽植密度的增加呈先增加后降低趋势.不同栽植密度沙柳灌丛土壤水分动态存在明显差异,沙柳灌丛土壤含水量随着栽植密度增大呈先增加后降低趋势,在栽植密度0.6株/m2（T2）达到最大值.在毛乌素沙地生境条件下,与水资源容量相适应的沙柳栽植密度约为0.6株/m2,在该栽植密度下土壤水分含量基本上能满足沙柳的生理生态需水.

英文摘要：

The patterns of the growth of artificial Salix psammophila shrubs and soil moisture in Mu Us sandy land was compared under different planting density during growing season. The experiment density included 0.2 plants/m2, 0.6 plants/m2 and 0 ）8 plants/m2. The results showed that planting density had significant effect on the patterns of the growth of artificial Salix psammophila shrubs. With the increasing of planting density, the plant height, average canopy, aboveground biomass, leaf biomass and stem biomass of Salix psammophila shrubs decreased after an initial increase. Planting density had significant effect on the soil moisture dynamic of artificial Salix psammophila shrubs. Soil moisture of Salix psammophila shrubs increased and then decreased with increasing of planting density, and the inflection point of the curve appeared in 0.6 plants/m2 density. The optimal density of artificial Salix psammophila shrubs was found to be approximately 0.6 plants/m2, because the best growth of Salix psammophila shrubs was in this density treatment.