珍稀植物十齿花群落乔木优势种群种间联结性

Inter-specific association of dominant tree species in rare plant Dipentodon sinicus communities of Yushe National Forest Park,Guizhou Province

采用2×2列联表,通过X2检验和W检验,分析了贵州六盘水市玉舍国家级森林公园十齿花群落20个主要乔木种群的种间联结性。结果表明:20个乔木种群在抽样面积分别为50、100和250m23种取样水平上均表现为显著的正关联,但取样面积为100m2,比50m2和250m2更为合适。结合联结系数(AC)和种间共同出现百分率(PC)等指标对其种间联结性的程度测度显示:各项指标对十齿花群落主要乔木种群之间联结性关系总体上反映了大致相同的结果,但不同的测定方法可以相互弥补由于单一方法分析的不足;十齿花种群与其它乔木种群之间的联结性较显著,而且多数为正联结。种间正联结性越强,其对环境要求越接近,生态位重叠值越大。

Based on 2 × 2 contingency table and with X^2- and W-tests, this paper analyzed the inter-specific association of 20 main tree species in the Dipentodon sinicus communities in Yushe National Forest Park of Liupanshui, Guizhou Province. The results showed that a significant positive association was observed at the sampling levels of 50 m^2, 100 m^2, and 250 m^2 quadrates, and a sampling size of 100 m^2 was more suitable than that of 50 and 250 m^2 for the inter-specific association analysis. The degree of inter-species association based on X^2-test, together with the association coefficient （AC） and percentage co-occurrence （PC）, showed that the indices applied could reflect the approximately same results, and multiple indices could remedy the insufficiency analyzed by a single index. The inter-specific associations between D. sinicus and other tree communities were comparatively significant, and mostly were of positive. The more intense the positive association, the more similar the environmental demand required, and the larger the value of niche overlap was.