【摘要】 [目的]为三江源地区的生态保护和建设提供实践参考。[方法]测定三江源地区高寒草甸、高寒草原2种草地类型,不同退化草地的群落特征,分析生态环境保护所面临的形势与问题。[结果]随着草地退化程度的加大,群落地上植物量和物种丰富度在各级草地内变化不明显,但优良牧草比例明显呈下降趋势,毒杂草比例明显上升,草地质量指数明显下降,甚至成为负值,草地的利用价值趋于0。[结论]保护三江源地区生态环境具有重要的生态意义。更多还原

【Abstract】 [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.更多还原