黑河流域张掖市城郊泛洪平原湿地植物多样性研究

根据物种多样性测度公式，按草本群落和灌木群落，分别研究黑河流域张掖市甘州区西城驿泛洪平原湿地2个群落的植物物种及其组成特征。结果表明，草本群落以芦苇为优势种，其重要值为24.16；灌木群落以小香蒲为优势种，其重要值为47.54。物种多样性分析结果表明，2个群落的物种多样性表现出较一致的趋势，多样性指数值较低，草本群落和灌木群落中的物种丰富度指数、多样性指数Simpson 指数和Shannon－Wiener 指数、均匀度指数均表现为草本群落>灌木群落，优势度指数则表现为灌木群落>草本群落；方差分析结果表明，2个群落的物种多样性指数之间差异不显著，即2个群落的结构没有发生明显变化。结果提示，该研究调查的湿地植物群落结构组成简单，物种多样性低，寡种优势现象极为严重。

Research of the Plant Diversity of Floodplains Wetland of Suburb of Zhangye City in Heihe River Basin

Based on measure formula of species diversity, the plant species and composition characteristics of herbage and shrub communities in floodplains wetland of suburb of Xichengyi of Ganzhou District of Zhangye City in Heihe River basin were investigated. The results showed that Phragmites communis was the dominant species of the herbage community, and the important value was 24.16. Typha minima was the dominant species of shrub community, and the important value was 47.54. The results of species diversity analysis of the two communities showed the consistent trends that the diversity index values were relatively lower. Furthermore, the abundance degree, Simpson diversity index, Shannon-Wiener index and uniformity index of shrub community were all higher than those of herbage community, whereas the dominant index of shrub community were higher than that of herbage community. The results of variance analysis showed that there were no significant differences of species diversity index between the two communities, indicating that the structure of the two communities had not obvious changes. It was indicated that the plant structure of the investigated communities were simple and the plant diversity were low, whereas the advantage phenomenon were serious.