Abstract
AbstractWe used the in-situ monitoring method to study the space and time dynamics of soil moisture (SM) of grassland and fixed dunes in Horqin Sandy Land at different yearly rainfall patterns, and the dynamic of SM, the impact of precipitation characteristics to SM were analyzed. Results showed that: (1) the seasonal dynamic of SM in the fixed dunes was significantly lower than that in the grassland. In a normal year, the seasonal dynamic of SM in two sandy lands was basically the same. Barring the months with big rainfall, the difference in SM between the months was small. SM in dry year continued to decrease before the rainy occurring, and after rainy, SM at fixed dunes increased significantly. In a wet year, the soil moisture of these two sandy lands showed an increasing trend with the months. (2) Under different precipitation years, the variation range of SM compared to the soil depth in the grassland was much more obvious than that in fixed dunes. Higher SM content generally occurred in the 30–60 cm soil layer; the SM of below 60 cm changed small, and below 90 cm, it tended to be stable.KeywordsSoil moisturePrecipitationDynamicFixed dunesGrasslandHorqin sandy land
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