塔里木河下游土壤风蚀期0～15cm层土壤含水率分布规律

Distribution of the Soil Moisture (0-15 cm) During the Soil Drifting in the Lower Reach of Tarim River

土壤表层含水率是影响土壤风蚀的一个重要参数。在塔里木河下游土壤风蚀期间对0~15 cm层土壤水分进行调查,发现0~15 cm层土壤含水率极低,平均含水率仅0.84%,含水率〉2%的区域主要分布在绿洲边缘和河道边缘。进一步探讨植被盖度、风沙活动强度和土壤结皮对0~15 cm层土壤含水率分布的影响,结果表明：①0~15 cm层土壤含水率与植被盖度的相关性不显著;②0~15 cm层土壤含水率与风沙活动强度呈显著指数负相关;③土壤结皮能够有效保护表层土壤水分,抑制土壤风蚀。

Surface soil moisture is one of the most important parameters influencing soil drifting.The moisture in 0-15 cm soil is investigated during the soil drifting in the lower reach of Tarim River.It was found that the soil moisture（0-15 cm） is very low,the average of the soil water content is only 0.84%,and the regions of the soil moisture more than 2% are concentrated in the edge of oasis and river.The relationships between the soil moisture and the vegetation coverage,the intensity of soil drifting,and the soil crust were analyzed.It shows that the correlation between the soil moisture（0-15 cm） and the vegetation coverage is not evident.The correlation between the soil moisture content and the intensity of soil drifting is significant exponential negative correlation.The soil crust can protect the surface soil moisture availably,and can restrain the soil drifting.