汾河连伯滩湿地植被生态种组

Ecological Species Groups of Wetland Vegetation on Lianbotan in Fen River, Shanxi

根据42个野外样方调查资料,采用Fisher精确检验、Pearson相关系数和Spearman秩相关系数,研究汾河连伯滩湿地21个优势种的种间关系,结合组平均法的聚类结果,对生态种组进行了划分。结果表明:1)在210个种对中,Fisher精确检验结果表明共有16个种对为正关联,1个种对为负关联;Pearson相关系数有20个种对为正相关,5个种对为负相关;Spearman秩相关系数有34个种对为正相关,7个种对为负相关;2)在所有的种对中,大多数种对间表现为不显著关联,种间不显著相关,说明优势种群间生态位相对分离;3)综合种间关联、种间相关和聚类分析结果,将21个优势种划分成4个生态种组,分别是芦苇生态种组、赖草生态种组、白茅生态种组和野艾蒿生态种组,这4个生态种组反映了随水分条件变化连伯滩湿地植被群落的组成特征。

Interspecies relationships between the dominant species of wetland vegetation on Lianbotan in Fen River,Shanxi by Fisher’s exact test,Pearson’s correlation coefficient and Spearman’s rank correlation based on the data collected from 42 field plots.Ecological species groups of those dominant species were studied by using group averaging clustering.The results indicated that： Sixteen species-pairs had positive association coefficient and one species-pair had negative association coefficient by Fisher＇s exact test.In addition,20 species-pairs had positive correlation coefficient and 5 species-pairs had negative correlation coefficient by Pearson’s correlation analysis.Furthermore,34 species-pairs displayed positive and 7 were negative correlations by Spearman.Associations and correlations between most species-pairs were not significant,which suggested that the dominant species distributed in an isolated pattern and their inches separated.On the basis of the results of association and correlation of those dominant species as well as that of analysis of clustering,those dominant species were divided into 4 ecological species groups： Phragmites australis group,Leymus secalinus group,Imperata cylindrical group,and Artemisia lavandulaefolia group,which reflected the characteristic of the vegetation community in this region with the moisture gradient.