中文摘要：

通过在伊犁河谷山前倾斜平原荒漠草地开展的不同灌溉量草地恢复试验，对测试的试验地内草地植物物种多样性指数和灌溉水量之间的关系进行了初步的研究。结果显示：在荒漠草地，水分是影响草地植物长势的重要限制因子，随着水分条件的转好，植被盖度和蒿类的分盖度均有显著的提高，草地植物的生物量和群丛高度均显著增加；随着灌溉量的增加，Simpson指数、Shannon—Wiener指数、Pielou指数和Margalef指数均出现递增的趋势，其中每增加1kg／d水量，Simpson指数将增加0．021，表明在温性荒漠草原生物多样性指数对水量变化的灵敏度较高。

英文摘要：

Base on the grassland restoration experiment in Yili pith plain, this article studied the relationship between the plant community diversity and the irrigation volume. The results showed; the water volume was the important factor in determining the vegetation growth in desert grassland ; the vegetation coverage and Seriphidium transillense coverage were obviously improved when the irrigation volume was increased, and the grass yield and average plant height were distincty increased too. Furthermore,all of the Simpson index, Shannon-Wiener index, Pielou index and Margalf index tended to be increased when the irrigational volume was added. By calculation, it was found that the Simpson index increased 0. 021 when the irrigation volume added 1 kg/d. Therefore, in temperate desert grassland. the plant diversity index is sensitive to water volume