Preliminary Discuss on Grassland Degradation in the Source Region of Yangtze and Yellow Rivers

Recently, the source area of Yangtze and Yellow River present the problem of ecology environment on vegetation degrading,land desertification process expanding rapidly and wetland ecology degrading.The degrading grassland and the changed causes in this region were analyzed.For there are the particular climate condition in Qinghai_Xizang(Tibet)Plateau, the grassland ecosystem in the source region of Yangtze and Yellow River responded very susceptible to the environment through evolving process.The human activities of the seasonal heavy grazing are the inducing and key factor,and the natural effect of the climate changing and mouse harming are aggravating factor lead to grassland degradation.Depending on each other ,the human and natural factors were the main factors resulted in the marked degeneration of grassland in this region.