Interspecific Association Research on the Dominant Species of Woody Plant in Shenyang Arboretum

Variance ratio(VR),χ2 test,Ochiai's coefficient(OI) and association coefficient(AC)were used to study the association of 27 dominant species in Shenyang Arboretum,Chinese Academy of Sciences.The results showed that the overall association among dominant species were not significantly positive correlation.27 dominant species composed 351 species-pairs.According to the result of χ2 test,the interspecific associations of 18 species-pairs were significant or extremely significant,15 species-pairs revealed significant or extremely significant positive correlation,3 species-pairs revealed significant or extremely significant negative correlation.Combined with Ochiai's coefficient(OI) and association coefficient(AC),it concluded that the majority of the 351 species-pairs showed no significant association,a very small part of species-pairs showed significant or extremely significant correlation.It indicated that the dominant species were not closely related to each other and they were relatively independent distribution,which showed the obvious secondary and juvenility characteristics.According to the interspecific association and the ecological habits of dominant species,13 ecological species groups were obtained.These ecological species groups would provide a certain reference on the construction of urban forest and the restoration of degraded vegetation.