Soil water is crucial to plant growth and plays a vital role in re-vegetation.Based on spatial databases and sampled soil moisture data

a method was developed to relate the sampled soil water data to different combinations of land typeland use-slope grade thus getting using GIS techniques

and maps were made indicating the spatial variation of soil water in different soil layers.Using these maps

we calculated the amount and distribution of average soil water content in different soil layers in Ansai county.The results showed: Soil moisture is at its bally difficult-available and difficult-available state before rainy season and at its slow-available and quick-available state after rainy season in soil layer of 0~60 cm.Compensatory rate of soil moisture is high.Soil moisture is at its bally difficult-available

difficult-available and slow-available state before rainy season and at its slow-available and quick-available state after rainy season in soil layer of 60~120 cm.Compensatory rate of soil moisture in this layer is lower than that in up-layer.Soil moisture is at its bally difficult-available

difficult-available and slow-available state before rainy season and at its difficult-available

slow-available and quick-available state after rainy season in soil layer of 120~200 cm.Compensatory rate of soil moisture in this layer is lower than that in up~layer evidently.Soil moisture is at its bally difficult-available and difficult-available state before rainy season and after rainy season in soil layer of 200~300 cm.Compensatory rate of soil moisture in this layer is very low.Soil moisture is at its bally difficult-available

difficult-available and slow-available state before rainy season and after rainy season in soil layer of 300~500 cm.Soil moisture of this layer can hardly be compensated and is steady state.