长柄双花木分布群落中优势种群间联结性研究

Studies on Interspecific Association Among the Dominant Species in Disanthus Cercidifolius. var. Longipes H.T.Chang Community

运用种间联结指数及2×2列联表的X2统计量分别测定了长柄双花木群落中物种总体关联性和群落中主要树种种对间的联结性.结果表明:群落物种总体表现出一定程度的正关联,群落处于比较稳定的阶段.群落中13种主要树种的78个种对中,有40个种对表现出正关联,有37个种对表现出负关联,1个种对表现为相互独立的关系,正负关联种对数比例接近1∶1.而长柄双花木与其它12个物种之间有8对表现为正联结,4对表现为负联结,但均未达到显著水平.根据种间联结系数和群落结构,长柄双花木分布群落中的13个主要优势种分为3个生态种组.

By the method of association index and X^2-test, the collective association and interspecific association in Disanthus cercidifolius. var. longipes H.T.Chang community are analyzed. The results are as following: there is a certain degree of positive association of the collectivity of the community. The community is at a relatively steady phrase. In the 78 species-pairs of 13 dominant species, there are 40 species-pairs which show positive association and 37 species-pairs show negative association. The ratio of of positive and negative association species-pairs is close to 1∶1. In the associations between Disanthus cercidifolius. var. longipes and the other 12 species, there are 8 positive species-pairs and 4 negative species-pairs, but all of them do not reach significant level. According to the association index and the community structure, the 13 dominant species in the Disanthus cercidifolius. var. longipes H.T.Chang community can be divided into 3 ecogroups of species.