黄河源区玛曲县草原退化研究初报

Preliminary Report on the Study of Grassland Degradation of Maqu Country in Source Region of Yellow River

以高寒草甸生态系统植物群落样地调查资料为基础,对不同退化程度植物群落结构及物种多样性特征进行研究分析。结果表明:随着草地退化程度的加剧,草地植物群落结构、物种组成及覆盖度均发生了很大变化,主要表现在物种数急剧减少、植被覆盖度下降、优良牧草比例大幅度减少,物种多样性明显低于自然生态系统。

In this paper, the plant community structure in different degenerated grassland and the species diversity characteristics were studied and analyzed based on the investigation data of plant community sample plots of alpine meadow ecosystem. The result indicated： Along with the degree of grassland degeneration aggravating, the plant community structure of grassland, the species composition and the degree of coverage has had tremendous changes, mainly presented as the rapid reduction of species number, reduction of vegetation coverage, high quality forage had decreased greatly and the species diversity is lower than the natural ecosystem obviously.