Effect of Soil and Water Conservation on Environment in Loess Plateau

Soil and water conservation is the basic of ecology restoration and reallocation of Loess Plateau. But when water and soil conservation reduced runoff and yield, it also changed the distribution pattern and cycle processes of water and nutrient and effected the environment of Loess Plateau. This paper analyse the affect of difference water and soil conservation on hydrology environment and soil environment. Water and soil conservation can modulate and control hydrological processes, improve the water quality, soil quality and soil moisture of watershed. However artificial forest and grassland reduced soil moisture of watershed in different extent. At the same time this paper discussed the relation between water and soil conservation and breakoff discharge in the Yellow River, dried soil layer.