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以毛乌素沙地南缘沙柳人工固沙灌丛为研究对象,对不同栽植密度(0.2、0.6和0.8株·m-2)沙柳灌丛生长季土壤水分动态和蒸散量变化进行研究.结果表明:不同栽植密度沙柳灌丛区土壤水分动态和蒸散量存在明显差异,土壤含水量随着栽植密度增加呈单峰型曲线;生长季内沙柳灌丛土壤含水量变化呈“S”形曲线,并与降雨存在密切的关系.蒸散量以栽植密度0.8株·m-2的沙柳灌丛最高(114.5mm),占同期降雨量的90.8%;以0.6株·m-2的沙柳灌丛最低(109.7mm).根据生长季土壤水分动态和水分平衡特征,毛乌素沙地南缘沙柳灌丛适种密度为0.6株·m-2.
The changes of soil water dynamics and evapotranspiration during the growing season of Salix psammophila shrubs at different planting densities (0.2, 0.6 and 0.8 plant · m-2) were studied with artificial sand-shrubs of Salix psammophila in the southern edge of Mu Us sandy land. : The soil moisture dynamics and evapotranspiration of Salix psammophila shrublands differed significantly with different planting densities. The soil water content showed a single peak curve with the increase of planting densities. The soil water content of Salix psammophila shrubs showed “S” Shaped curve and had a close relationship with rainfall.The evapotranspiration was the highest (114.5 mm) in Salix shrubs with the density of 0.8 plant · m-2, accounting for 90.8% of the rainfall in the same period; The lowest is shrub (109.7 mm) .According to the characteristics of soil water dynamics and water balance during the growing season, the suitable density of Salix psammophila in the southern margin of Mu Us sandy land was 0.6 plant · m-2.