Review of the Mechanism and Model of Soil and Water Loss

The hypostasis of soil and water loss is to beget the worsening of physical and chemical characters of soil ,the decline of soil fertility and the reducing of soil using rate. It not only brings about destroying of soil resources, serious degradation of soil , frequent disasters of flood and drought, and deterioration and unbalance of ecological environment, but directly threatens survival and development of human beings. The progresses in research on the mechanism and model of soil erosion ,soil nutrient loss and runoff are reviewed briefly in this paper, including the research background and actuality of soil and water loss. All this may contribute to the study of soil and water loss in the future, the establishment of projects of soil and water conservation ,and the configuration of measures for soil and water conservation.