江河源区草地退化状况及成因

近年来 ,江河源区存在草场严重退化、土地荒漠化过程加剧、水土流失加重以及湿地生态衰退等以草地生态系统为主的生态环境退化问题。分析研究结果表明 ,在青藏高原特殊的地理气候背景下 ,经过长期自然演化形成的江河源区脆弱的草地生态系统 ,对外界环境条件反应极其敏感 ,季节性过牧等人类活动是造成该区近期草地迅速退化的突破口和主导因素 ,从而促使气候、鼠害等自然因子作用加剧。江河源区的草地退化 ,是人为因素和自然因素共同作用下人为加速加剧的结果。

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.