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.