【摘要】 深层渗漏是降雨补给地下水的重要途径，维系了沙地地下水资源的可持续利用，为半干旱沙区生态系统提供水文效益。以原位观测的形式对毛乌素沙地的流动沙地、典型植被樟子松（Pinus sylvestrix var. mongolica）固沙林和沙柳（Salix psammophila）固沙林开展研究。利用深层渗漏记录仪和土壤水分监测设备开展连续3年的深层渗漏量和土壤水分监测。采用相对可利用土壤水指数（RESW）、水量平衡方程等研究了固沙植被对土壤水分和深层渗漏的影响。结果表明，流动沙地深层渗漏的发生与大于10 mm的降雨量密切相关，与年降雨量无关。植被覆盖度增加和乔木树种的选择显著地减少了深层渗漏量。流动沙地的RESW均高于沙柳和樟子松固沙林。沙柳固沙林浅层（0～80 cm）RESW低于樟子松固沙林，但沙柳固沙林深层（80～200 cm）RESW高于樟子松固沙林。植被冠幅和根系分布是阻断降雨渗漏的关键因子，应根据冠幅和根系范围来确定固沙树种的最大种植密度。更多还原

【Abstract】 Deep percolation is a crucial pathway for rainfall recharge to groundwater, supporting the sustainable use of groundwater resources in sandy areas and providing significant hydrological benefits to the semi-arid sandy ecosystem. This study conducted in-situ observations in the Mu Us Sandy Land, focusing on mobile sandy land, Mongolian Scots pine(Pinus sylvestris var. mongolica) stabilized sandy land, and sand willow(Salix psammophila) stabilized sandy land. Continuous three-year monitoring of deep percolation volume and soil moisture was carried out using deep percolation recorders and soil moisture monitoring equipment. Methods such as the relative extractable soil water index(RESW) and water balance equation were used to study the impact of sand-stabilizing vegetation on soil moisture and deep percolation. The results showed that deep percolation in mobile sandy land was closely related to rainfall events exceeding 10 mm, but not to the annual total rainfall. Increasing vegetation cover and selecting tree species significantly reduced deep percolation volume. The RESW of mobile sandy land was significantly higher than that of sand willow and Mongolian Scots pine stabilized sandy lands. The shallow layer(0-80 cm) RESW of the sand willow stabilized sandy land was significantly lower than that of the Mongolian Scots pine stabilized sandy land, while the deep layer(80-200 cm) RESW of the sand willow stabilized sandy land was significantly higher than that of the Mongolian Scots pine stabilized sandy land.Canopy cover and root distribution were key factors in blocking rainfall percolation, and maximum planting density should be determined based on canopy cover and root range.更多还原