Research or Regulation of Vegetation Succession in Degraded Grassland in Qinghai and Tibetan plateau

Research did on the form of vegetation,combination characteristic of plants community in the grassland-degraded procession,probe into the mechanism of succession of vegetation and model of succession of rehabilitation.Result show that superiority condition of main vegetation community has great changes,covering rate of vegetation,biomass above ground,rate of prodectivity of superiority grass declined obviously in the degraded procession.The roots of grassland plants become less and less along with the grassland degraded.The percentage of grass and soil decreased obviously.Percentage from 1:5 of slight degraded become into 1:400 of medium degraded style.The mechanism of degraded grassland and biology procession were analysis,the countermeasures of rehabilitation are raised.