Abstract

Soil and water conservation vegetation can effectively conserve soil and water, relief of destruction caused by sandstorms and haze weather, and the improvement of ecological environment. But along with plant growth and root development rain intercepted by canopies and water use by plant increased which caused serious soil drying. Soil drying sometime development into serious drying, which eventually result in soil degradation, vegetation decline and agriculture failure in water-limited regions. In order to solve these problems When the soil moisture resources in the maximum infiltration depth equal Soil Moisture Resources Use Limit by Plant , the relationship between soil water and plant growth has to be regulated on the Soil Moisture Carrying Capacity for Vegetation to ensure sustainable use of Soil Water Resources, forest sustainable development and the sustainable produce of crop to meet the people’s increasing need of forest products and agricultural produce and better environment.