ECOLOGICAL ENVIRONMENT DETERIORATION, MIRE DEGENERATION AND THEIR FORMATION MECHANISM IN THE ZOIGE PLATEAU

The indication of mire degeneration has appeared since 1960 s in the Zoige platean.After forty years, the ecological environment deterioration and mire degeneration are tending towards more serious.The damages of the regional ecological environment and mire ecosystem are so grave that they can hardly be recovered by self_healing and artificial restoration.The behaviors of ecological environment deterioration and mire degeneration are as follows: aridity,type alteration,retrogressive ecological succession,region desertification,decreasing of quantity in species and population of rare animal,soil degeneration,declining of mire water_logging quality,grassland degeneration and rat disaster rampancy.It is undoubted that the neotectonics rising and warming and drying the climate are favorable for ecological environment deterioration and mire degeneration and provide the possibility for those but the human activity interference,which includes denuding forest,draining mire,exploiting peat and over_pasturing make the possibility into reality.Compared with natural factors,human activit interference is a main cause for the ecological environment deterioration and mire degeneration.