中文摘要：

为探讨半干旱区沙柳固定沙丘土壤水分对降雨的响应,采用AV-3665R型雨量计、ECH2O-5土壤水分传感器、土壤深层水量渗漏测试记录仪同步监测毛乌素沙地东北缘沙柳固定沙丘2013年降雨、0-200cm深度土壤体积含水量、200cm以下渗漏量,分析沙丘土壤水分变化、降雨入渗特征及降雨对土壤水的补给作用。结果表明：5-11月累计降雨399.4mm,其极显著影响0-200cm深度土壤水分变化（P〈0.01）;且0-200cm深度土壤体积含水量较低[（4.26±0.23）%]时53.8mm（历时71h）降雨开始后310h,土壤体积含水量较高[（6.16±0.57）%]时88.6mm（历时62h）降雨开始后70h湿润锋到达200cm;试验期间降雨对土壤水有一定补给作用,其中（15.9±7.1）mm降雨蓄存在于0-200cm深度土壤中,占同期降雨的（4.0±1.8）%,200cm以下深层渗漏水量为3.1mm,占同期降雨的0.8%。

英文摘要：

To investigate soil water content to response time for rainfall in the semi-arid area of the fixed dunes,AV-3665R-type rain sensor,ECH2O-5soil moisture sensor and logger of deep soil water leakage were used to measured rainfall,soil water for 0-200 cm and leakage below 200 cm in the Salix psammophila fixed dune of the Mu Us Sand Land from May to September,2013.The soil moisture variations,infiltration of rainfall and soil water recharges characteristics for rainfall were analyzed.The results showed that cumulative rainfall 399.4mm was significantly affect 0-200 cm soil moisture（P〈0.01）,when lower average moisture of 0-200cm（4.26±0.23）%,53.8mm rainfall after 310 hwas able to infiltration into the 200 cm soil,when higher average moisture of 0-200cm（6.16±0.57）%,this value was 88.6mm rainfall after 70 h.Rainfall had recharge the following soil moisture of 200 cm during the test,which（15.9±7.1）mm moisture accumulated in the 0-200 cm soil,account for（4.0±1.8）%of the rainfall,and below 200 cm deep leakage water was 3.1mm,accounted for 0.8%of the rainfall.