The Effects and Position of Natural Grassland on Controlling Soil Erosion and Desertification in Watershed of the Middle and Upper Reaches of Yellow River
Su Daxue [WT6BZ](Institute of Geography and Natural Resources Studies, Beijing 100101) [WT5”HZ]
Natural grassland is the largest vegetation type according to land area in the watershed of the middle and upper reaches of Yellow River, which has been formed through a long time by succession and adapted those areas during recent decades due to lack management and over reclamation, over grazing and other exploited uses has desturbed the natural grassland badly and caused serious soil erosicon and desertification which formed a sorrow of China. For control of soil erosian desertification and restoration the natural enviroment. We must conserve grassland and improve its coverage which will play a key role for contral of soil erosian and desertification, ecological environmental recurstruction and austainable developement of economy of that watershed, and can not be insteaded by other practices.