崖柏群落优势乔木树种种间关系

采用样方调查法,对组成崖柏群落的乔木树种进行调查。通过计算重要值确定崖柏群落优势乔木树种,研究优势树种的总体联结性、2物种间的联结性和种间协变。结果表明:崖柏群落内的15个优势树种总体间存在负关联;2物种间具有显著正联结的种对有:高山栎-川陕鹅耳枥、高山栎-华中八角、大叶青冈-乌岗栎、铁杉-华西花楸、华千金榆-青榨槭、华千金榆-大叶青冈、大叶青冈-川鄂山茱萸、川陕鹅耳枥-华中八角;呈显著负联结的种对是高山栎-青榨槭;崖柏与其他优势树种的联结性均未达到显著程度;有26个种对表现出明显的正协变,12个种对表现出明显的负协变;种对正协变的存在是由于这些物种对环境资源的利用具有相似性所致。

Interspecific relationships of dominant tree species in Thuja sutchuenensis community

By the method of sampling plots investigation,the tree species composition of Thuja sutchuenensis community was studied,with the dominant tree species of the community ascertained by calculating the importance value.The overall association,interspecific association,and interspecific covariation of the dominant tree species were also studied.The results showed that an overall negative association was existed among 15 dominant tree species.The pairs with positive interspecific association were Quercus semecarpifolia-Carpinus fargesiana Q.semecarpifolia-Illicium fargesii,Cyclobalanopsis jenseniana-Q.phillyraeoides,Tsuga chinensis-Sorbus wilsoniana,C.cordata var.chinensis-Acer davidii,C.cordata var.chinensis-C.jenseniana,C.jenseniana-Macrocarpium chinense,and C.fargesiana-Illicium fargesii.The interspecific association of Q.semecarpifolia with A.davidii was negative,while that of T.sutchuenensis with other species was not significant.26 pairs of species showed a significant positive interspecific covariation,and 12 pairs showed negative interspecific covariation.The similarity of environmental resources utilization could be the reason of the positive interspecific covariation.