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中文摘要：
采用控制放牧试验,在昭苏研究了短期放牧强度对草甸草原植被特征及多样性的影响.结果表明,放牧后草群高度、盖度及地上生物量均明显降低（P＜0.05）,密度变化不显著,且轻度放牧、中度放牧、重度放牧间植被特征差异不显著（P＞0.05）;放牧显著增加了草原苔草重要值,降低了针茅重要值（P＜0.05）,其余草种相对较为稳定;放牧显著影响了Shannon-wiener指数、Pielous均匀度指数,且轻度放牧下达到最高（P＜0.05）,而对Margalef物种丰富度、Simpson指数、Mclntosh指数、Alatalo均匀度指数影响不显著（P＞0.05）.短期放牧强度对草地植被特征的影响较缓慢,对植被多样性的影响相对较快.
英文摘要：
The influence of short-period grazing intensity on vegetation characteristics and diversity in Zhaosu Meadow Steppe was studied by plot grazing experiment. The result showed that compared with CK,the height coverage and biomass of vegetation community under grazing condition were significantly decreased （P 〈0.05）, the density was no significantly changed （P 〈0.05）.There were no significant differences of vegetation characteristics among light grazing, moderate grazing and heavy grazing （P 〉0.05）. With increasing the grazing intensity, the importance value of Carex liparocarpos was significantly in- creased,Stipa capillata was significantly decreased （P %0.05）,and the other species were relatively stable.The grazing conditions had significant influence on Shannon-wiener index and Pielous evenness index and light grazing reached the highest （P 〈0.05） ,but there were no significant influences on Margalef species richness,Simpson index,Mclntosh index and Alatalo evenness index （P 〉0.05）.The short peoriod of grazing intensity had slower influence on the characteristics of pasture vegetation but fast influence on vegetation diversity.
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