中文摘要：

本研究首先运用ＴＷＩＮＳＰＡＮ 把云顶山亚高山草甸３６个样方分为５个群落类型，作为５个综合资源位。采用Ｌｅｖｉｎｓ、Ｓｈａｎｎｏｎ－Ｗｉｅｎｅｒ生态位宽度指数和Ｐｅｔｒａｉｔｉｓ生态位重叠指数，对云顶山亚高山草甸优势种群的生态位宽度和生态位重叠进行了研究。结果表明，１０个优势种群中嵩草的生态位最宽，Ｌｅｖｉｎｓ生态位宽度和Ｓｈａｎｎｏｎ-Ｗｉｅｎｅｒ生态位宽度分别为８．７８和３１．５８，对环境有广泛的适应性。云顶山亚高山草甸不同群落类型内种群生态位宽度越大，对环境的适应能力越强，对资源的利用能力也越强；生态位重叠越大，种群间的生态相似性越大，利用资源的相似性程度越高。嵩草＋蒲公英群落中优势种群生态位普遍重叠值最高，为０．９１４，各物种有较强的利用资源的共性。硝酸盐含量与施氮量呈极显著相关。深施对黑麦草的分蘖数和株高产生影响，但促进黑麦草产量、粗蛋白含量和氨基酸含量的提高。

英文摘要：

TWINSPAN was used to divide 36 types of communities as five resource states. quadrates of subalpine meadow in the Yinding Mountain into five Niche breadths and niche overlaps of dominant species of the subalpine meadow were measured and analyzed using the indexes proposed by Levins, Shannon--Wiener, and Petraits. Niche breadth of Kobresia bellardii was the biggest among the ten dominant species with a Levins niche breadth of 8.78 and Shannon--Wiener niche breadth of 31.58. The species had extensive adaptation to the environment. The bigger the species＇ niche.breadths in the suba their adaptation to the environment and the stronger their capabilities lp of ine meadow, the more extensive were using resources. The greater were the species~ niche overlaps, the greater were the ecological similarities between species and their resources-use The niche overlaps of the dominant species in K. bellardii and Taraccacum mongolicum communities were the biggest （0. 914）, and the two species had common characteristics of resource use.