中文摘要：

以三江平原分布最广的毛果苔草(Carex lasiocarpa)群落和小叶章(Calamagrostis angustifolia)群落为研究对象,研究2个群落的植物物种及其组成特征。结果表明,毛果苔草群落以毛果苔草为优势种,以漂筏苔草(C.pseudocuraica)为亚优势种,二者的重要值之和为56.4%;小叶章群落以小叶章为优势种,其重要值为50.8%。物种多样性分析表明,毛果苔草群落和小叶章群落的Simpson指数(D)、Shannon-Wiener指数(H)和Pielou均匀度指数(J)均有较大波动,且H与J呈显著正相关,与D呈显著负相关,与S无显著相关关系;毛果苔草群落的H、D、J和S均高于小叶章群落,但差异不显著;2群落的相似性指数为46.5%,表明二者间存在一定的联系。

英文摘要：

The investigation on the species and composition characteristics of Carex lasiocarpa and Calamagrostis(angustifolia) communities distributed mostly in Sanjiang Plain showed that C.lasiocarpa and C.pseudocuraica were the dominant species,with the total important value 56.4%.C.angustifolia was the dominant species of C.angustifolia community,with the important value 50.8%.Species diversity analysis suggested that there were some fluctuations in Simpson(D),Shannon-Wiener(H) indices,and Pielou evenness(J) of th...