湖南临武平溪洞山地湿地宽叶泽苔草群落种间联结分析

Analysis on the interspecific association of Caldesia grandis community in Linwu Pingxidong mountain wetland of Hunan Province

平溪洞为湘南地区一处典型的山地沼泽湿地,湿地中分布的宽叶泽苔草为现今发现的种群数量最大的一个野外分布点。调查发现,在30个宽叶泽苔草群落样地内共分布有57种湿地植物,物种多样性较高。通过选取10个湿地植物构成的45对物种,采用χ2检验、种间共同出现百分率(PC)、联结系数(AC)和点相关系数(Ψ)等指标,进行种间联结性分析,结果表明:群落内宽叶泽苔草与其它多数物种间的联结性均不显著,群落内物种的分布包括宽叶泽苔草均表现出一定的相对独立性。联结性不显著或表现出相对独立性,正是宽叶泽苔草生境特殊、分布区域极窄的反映。

Pingxidong is a typical mountain marsh wetland of south Hunan Province. And there is a largest wild distribution plot of the populations of Caldesia grandis in nowadays found. Survey found that there are 57 wetland plants in the 30 Caldesia grandis community plots,and the species diversity is higher. Among the 45 species pairs of the main 10 wetland plants,we analyzed the interspecific association,using the χ2test,the percentage of co-ocurrence（ PC）,the association coefficient（ AC） and the correlation coefficient（ Ψ）. The results show that Caldesia grandis and most other species are not significant association in the community,and the distribution of species including Caldesia grandis showed a relative independence. No significant association or showing relative independence is a reflection of special habitat and very narrow distributing.