The organic litter will help to cushion trampling forces, limit the compactability of soils, release plant nutrients, and reduce the erosie forces of rainfall.
It even results in geologic hazard;for the mine geologic hazard,the background of physiognomy is the potential factor,while the irrational exploitation is the magistral factor.
Bad weather, such as the heavy summer rains, after drouth, which saturate ploughed soil, reduce soil shear strength, facilitate masse soil movement, and instigate gullying.
Abstract : In dry area or sandy dryland, for the reason of scarce rainfall, windiness and lack of labor power and material resources, the low survivor ratio of afforestation were common.