中文摘要：

土壤水分是干旱及半干旱地区植被恢复的关键因素之一。土壤水分严重影响着退化生态系统的恢复与重建,因此,为了探明黄羊滩沙地土壤水分时空变化规律,在黄羊滩地区取流动沙地、半固定沙地、固定沙地3种不同类型的土样,采用烘干称重法进行分析。结果表明,流动沙地空间尺度上土壤含水量的剧烈变化湿沙层在10-40 cm,稳定层在大于40 cm,时间尺度上土壤含水量9月份高于8月份。侧柏半固定沙丘随着生长季的来临土壤含水量呈下降趋势,7、8月份由于降水的增加含水量有明显的增加。流动沙地在空间尺度上土壤含水量的变化幅度大于固定沙地的土壤含水量。

英文摘要：

Soil moisture is one of the mest important factors, because it affect the comeback and reconstruct of the degenerate ecosystem severely. In order to understand the varying pattern of soil moisture in Huangyangtan sandy land, a study had been carried out in mobile sandy land, immobile sandy land, half-mmobile sandy land, with the gravimetric method. There the resuit suggests：moisture changing layer of soil water moisture is in 10-40 cm in mobile sandy land. Stable layer is above 40 era. Soil moisture is higher in September than August. Soil moisture is in downtrend in Platydadus orientalis forest with its growth,because of moisture increasing in July and August. SO soil moisture is increased. Soil water moisture in immobile sandy land is less than mobile sandy land.