甘肃敦煌西湖湿地芦苇群落种间关联性研究

为了探明甘肃敦煌西湖湿地芦苇群落的物种组成和种间关系,在对其植物群落进行样方调查的基础上,通过2×2列联表,采用方差分析、χ2检验、Ochiai指数、Dice指数和Jaccard指数对甘肃敦煌西湖湿地芦苇群落8个主要物种组成的28个种对间的关联性和相关关系进行了深入分析研究。结果表明:(1)芦苇群落总体间的关联性表现为显著正关联。(2)在28对种对中,有20对显示为正关联,占总关联对数的71.4%;有8对显示负关联,占总关联对数的28.6%。(3)芦苇群落种对间多呈正关联,正负关联的对数比为2.5,正关联占优势,但关联性较弱,负关联数较少,但关联性较强;28种物种对之间关联程度及共同出现概率不高,多数表现为无关联。

Study on Interrelated Dominant Community between Species of Phragmites communis in Dunhuang Westlake Wetland of Gansu

In order to find out species composition and interspecific relationship of reed community in Dunhuang Westlake Wetland of Gansu,we investigated the relevance and correlation of 28 sepcies pairs (between species to species) composed of 8 dominant species of reed community in Dunhuang Westlake Wetland of Gansu,according to quadrat investigation of plant community,on the basis of 2×2 contingency table,using analysis of variance,chi-square test,Ochiai index,Dice and Jaccard index.The results showed:(1)The overall correlation among dominant species of reed community showed a significant positive correlation;(2)Among the 28 sepcies pairs,20 pairs showed a positive correlation accounted for 71.4% of the total correlation pairs;8 pairs showed a significant negative correlation accounted for 28.6% of the total correlation pairs;(3)Reed community species pairs showed a significant positive correlation,and the logarithmic ratio of positive and negative correlation was 2.5.The positive correlation was dominated (correlation was weak) and the negative correlation was low (correlation was strong).The correlation and probability of common occurrence of 28 species were not high,and most showed no correlation.