新疆喀纳斯湖北端河漫滩湿地植物群落演替

Community succession of floodplain wetland plants at north end of Kanas Lake,Xinjiang

对喀纳斯湖北端河漫滩湿地植物群落进行了调查取样,通过除趋势对应分析(detrended correspondence analysis,DCA)排序研究了群落演替的动态,同时采用Shannon多样性指数、Margalef丰富度指数、Simpson多样性指数和Pielou均匀度指数,分析了物种多样性在群落演替过程中的动态变化,并运用去势典范对应分析(detrended canonical correspondence analysis,DCCA)方法,分析了不同样方中土壤因子与群落多样性指数之间的关系。结果表明:1)该区域植物群落演替序列为泽生苔草群落→西伯利亚早熟禾群落→金露梅群落→沼桦群落→西伯利亚云杉群落;2)随着演替的进行,群落物种优势度显著增加,而物种多样性呈先增加后降低的趋势,金露梅群落最高;3)土壤含水量和群落物种优势度之间存在显著负相关。

An investigation was made on the plant communities in the floodplain wetlands at north end of Kanas Lake, Xinjiang. The dynamics of plant community succession was studied by detrended correspondence analysis （DCA） ordination technique, and the dynamics of species diversity in the community succession was analyzed by using Shannon diversity index, Margalef’s richness index, Simpson’s diversity index, and Pielou’s evenness index. The relationships between species diversity and soil factors were also analyzed by detrended canonical correspondence analysis （DCCA）. In the study region, the plant community succession was in the sequence of Carex melanostachya→Poa sibirica→Potentilla fruticosa→Betula humilis→Picea obovata. Along with the succession process, the species dominance increased significantly, while the species diversity decreased after an initial increase, with a peak at the phase of community Potentilla fruticosa. There was a significant negative correlation between species dominance and soil water content.