⑴Natural factors. There are mainly four aspects: terrain, precipitation, soil (composition of soil materials) and vegetation.
①Terrain. The steeper the slope of the soil, the faster the surface runoff flows and the stronger the force of erosion on the soil. The longer the slope, the more surface runoff is collected and the stronger the scour force.
②Precipitation. Precipitation that causes water and soil erosion is usually heavy rain with greater intensity. Only when the precipitation intensity exceeds the soil infiltration intensity will surface runoff (super-infiltration) be generated, causing surface erosion and erosion.
③ Composition of the crushed material.
④ Vegetation. Forest and herbaceous vegetation that achieves a certain tree cover density can protect soil from erosion. Plus neck closureForest green is higher, the more effectively it retains water and soil.
⑵Human factors. Unreasonable use of land by humans has destroyed ground vegetation and stable terrain, causing severe water and soil erosion.