川西北高寒沙地不同恢复年限对土壤水分变化的影响

Effects of Different Restoration Years on Soil Moisture in Alpine Sandy Land of Northwest Sichuan

以川西北高寒若尔盖县沙化地区土壤水分作为研究对象,对不同沙化类型、不同恢复年限的沙化土壤水分进行测定。结果表明:川西北高寒沙地降雨量具有极强的季节性,整体呈现出土壤含量率夏季>秋季>春季,0~20 cm的土壤含水率与降雨量的相关性较20~60 cm更为明显;不同沙化类型土壤水分含水率与土壤物理性质、植被盖度等因素密切相关,土壤平均含水率表现为:草地>轻度沙化>中度沙化>重度沙化;流动高寒沙地土壤整体含水率显著低于草地土壤,但随着恢复年限的增加,差异逐渐缩减。

Taking the soil moisture in the desertified area of Zoige county in northwest Sichuan as the research object,the soil moisture of different desertification types and different restoration years were measured. The results showed that the rainfall in the alpine sandy land of northwest Sichuan had a very strong seasonality, and the order of overall soil content rate from high to low was summer, autumn and spring. The correlation between soil moisture content of 0-20cm and rainfallwas more obvious than that of 20-60 cm. Soil water content of different desertification types was closely related to soil physical properties, vegetation coverage and other factors. The average soil water content from high to low was grassland, light desertification, moderate desertification and severe desertification. The overall soil moisture content in mobile alpine sandy land was significantly lower than that of grassland soil, but the difference gradually decreased with the increase of restoration years.