A study on water restoration of dry soil layers in the semi-arid area of Loess Plateau A study on the effect of soil moisture of different vegetations in Loess Hilly Region Dry soil layer forming and soil moisture restoration of alfalfa grassland in the semi-humid region of the Loess Plateau Alfalfa Growth Characteristics and Soil Water Dynamics of Grassland Converted from Cropland in Semi-arid Region