Forecast of influence of coal-mining subsidence on soil erosion and land use

The ecological fragile Shanxi-Shaanxi-Inner Mongolia District, having most new-built and waiting-built coal mining areas, is confronted with great ecological environment pressure. Precise forecas of soil erosion and land-use changing speed-up by artificial mining subsidence is propitious to provide basis references of ecological restoration and rehaibilitation for the ecological fragile district. This study reported the soil erosion and land use change information which was abstracted from graphics overlapping, analogizing and experts consulting for the Tashan coal mine of Datong in Shanxi province. Results indicate that 1)88.80% of land in this area is eroded and subsided in various degree. 2)The annual gross soil erosion has increased by 423226.67～790452.05 t after subsidence. The soil erosion intensity has come up to a new grade in part of this area. 3)The cracks, subsidence and small landslide caused by surface movement deformation, have divided the cultivated land into small pieces. For intense, the smallest area of arid land is 7.72 m², forest land is 72.95 m², low overlay grass land is 9.44 m². 4)Compared with original geomorphy, the land utilization ratio which droped respectively by 10%, 10%～20%, 20% is 14.05%, 85.15%, 0.77% excepting industrial land, traffic land and residential areas.