Analysis on Plant Communities Features of Different Degradation Grassland in Sanjiangyuan Region

[Objective]The research aimed to provide practical references for the ecological protection and struction of Sanjiangyuan region.[Method] Plant communities features of different degradation grassland,two grassland type of alpine meadow and alpine meadow in Sanjiangyuan region were measured.The situation and problem of eco-environment protection was analysed.[Result] The results showed that the biomass and species richness in every site didn't change obviously as the increasing of grassland degradation.The rate of fine herbage tended to decrease and that of poison weeds tended to increase.The quality index of grassland decreased obviously and the utilization value of that tended to be useless.[Conclusion] The eco-environment protection of Sanjiangyuan region had important ecological significance.