围栏封育对高寒草地植被数量特征的影响

对青海湖地区高寒草地围栏内外植被进行调查分析。结果显示，围栏封育措施使高寒草地植被的盖度、高度、生物量均明显增加，从不同经济类群分析，其禾草、莎草等可食牧草比例增加，而不可食牧草比例相对下降。围栏封育措施对群落组成结构及植物种的重要值产生不同程度的影响，主要表现在生物多样性增加，一些可食牧草的重要值增加，而不可食牧草的重要值相对下降。

Effects of enclosure on the quantitative characteristics of alpine vegetation

A field survey was conducted to investigate the quantitative characteristics of alpine vegetation among grazing area and fenced area. The results of this study showed that the fence obviously increased the coverage, height and biomass of alpine vegetation, proportion of palatable forage group, which included grasses, sedges and other forages, and decreased the proportion of unpalatable forage. Meanwhile, the fence changed the community composition structure and dominant values of plant species, indicating that the fence increased plant diversity and the important values of some palatable forage, and decreased the important values of some unpalatable forage.