Niche and Interspecific Association of Dominant Species in Phoebe sheareri Natural Community
[Objective]In order to explore the interspecific correlations and the stability of Phoebe sheareri natural community.[Method]Based on field sample survey,the ecological niche characteristics and inter-specific associations of dominant species in the arbor layer and shrub layer of P.sheareri community were studied by through species composition,important value,niche breadth,niche overlap index,variance ra-tio method,and χ2 test.[Result]The important value,Levins niche breadth,and Shannon-Weaver niche breadth of P.sheareri were the largest in the investigated communities,indicating that both the resource utilization degree and competitive advantage were strong.The dominant species in the arbor layer showed an overall insignificant positive association(VR=1.247,χ20.95(12)>W>χ20.05(12)),while the shrub layer showed an overall insignificant negative association(VR=0.674,χ20.95(36)>W>χ20.05(36)),indicating that the stability of the arbor layer was higher than that of the shrub layer.The χ2 test result showed that the positively as-sociated species pairs were more than the negatively onepairs,and the ratio of positive to negative associ-ation of arbor layer and shrub layer were 1.8∶1 and 1.5∶1,respectively.The majority of species pairs were not significantly associated,indicating that the ecological characteristics of most dominant species in the P.sheareri community were relatively consistent.[Conclusion]The P.sheareri community was is relat-ively stable.However,appropriate artificial tending practices should be carried out to promote the natural regeneration of these P.sheareri populations.
Phoebe shearerinatural communitydominant speciesnicheinterspecific association
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