《Tab.3 Dynamic transfer matrix of land use during 1980-2018in Kuye River Basin》

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《近40年来窟野河流域土地利用类型变化及驱动因素》

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km2

Through comparison，it can be found that over the last 40years，the area of farmland in this area declined considerably，and the area of forest land increased significantly.Meanwhile，51%of sand land and 79%of unused land converted to grassland.It shows that the measures such as large-scale afforestation and grass planting as well as returning the grain plots to forestry promoted in this area achieved good results.Plenty of sand land and unused land were used for ecological construction，which resulted in an increase in the vegetation coverage and improvement of the overall ecological environment in this area.This phenomenon was basically consistent with the research result of Wang et al.[12]in 2017.But at the same time，the coal mining was expanding.The annual exploitation quantity increased from 900 000tons in 1980to 225million tons in 2017with an increase of nearly 250times.Meanwhile，the mine area evidently expanded，the growth rate of which even reached to 192 33%.The effect of this situation on the environment could not be ignored.