黑河流域湿地典型植物群落的物种多样性

以黑河流域分布最广的芦苇（Phragmites communis）群落和长苞香蒲（Typha angustata）群落为研究对象，分析其植物物种组成特征。结果表明，芦苇群落中芦苇为优势种，稗（Echinochloa crusgalli）为亚优势种，二者的重要值之和为56.4%；长苞香蒲群落中长苞香蒲为优势种，重要值为35.09%。物种多样性分析表明，芦苇群落和长苞香蒲群落的Shannon Wiener多样性指数(H′)、Pielou均匀度指数(J)、Margalef物种丰富度指数（F）和生态优势度指数(D)中，H′与J、F呈显著正相关，与D呈显著负相关；长苞香蒲群落的物种多样性高于芦苇群落，前者更稳定；两个群落的相似性指数为52.94%，二者间存在一定的联系。

Species diversity of typical wetland plant communities in Heihe River

The investigation on the species and composition characteristics of Phragmites communis and Typha angustata communities distributed mostly in Heihe River was carried out. The results showed that P. communis and Echinochloa crusgalli were the dominant species, with the total important value of 56.4% of P. communis community. T. angustata was the dominant species of T. angustata community,with the important value of 35.09%. Species diversity analysis of the Shannon Wiener (H′) indices, Margalef abundancedegree (F)、Pielou evenness (J) and dominant index (D) of the two communities suggested that there were significant positive correlation between H′ and M, and H′ and J. Significant negative correlation existed between H′ and D. T. angustata community species diversity was higher than P.communis community and the former one is more stable. The similarity index of the two communities was 52.94%, indicating that there is some relation between them.