根据2×2联列表,在25 m2、50 m2和100 m23个不同取样水平下,运用方差比率法、共同出现百分率、联结系数、点相关系数和卡方检验对梅花山拟赤杨群落主要树木种群间联结关系进行分析。结合梅花山拟赤杨群落特征及区域植被特征,以25 m2为取样水平来测定种间联结性。结果表明:拟赤杨群落中主要种群在总体上表现出正关联,15个优势种在总体上呈现较弱的联结趋势,说明该群落不稳定,尚处于演替阶段。
Different indices were used based on 2×2 contingency table to determine the interspecific association of the 15 main tree populations of Alniphyllum fortunei community in 25 m2,50 m2 and 100 m2 size quadrates.The results showed that the quadrates of 25 m2 could exactly display the characters of connection between main tree populations and the whole community.There was positive correlation among main populations in general.But the interspecific association was at a level of little significance,reflecting a certain trend of community succession.These indicated that the community was not mature,and was in the phase of succession.