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

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 0−20 cm 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.