Niche characteristics of dominant populations within mixed broadleaf-conifer forest in Qingyanghu national park
The niche theory has been successfully used to explain competition mechanisms among the coexisting species in natural communities, which is significant for understanding of the coupling between plant community construction and environmental factors. Based on community survey, by using the formulas of Levins niche breadth and Pianka niche overlap,the niche characteristics of 7 trees,10 shrubs and 7 herbs within mixed broadleaf-conifer forest in Qingyanghu national parkwere analyzed.The results showed that (1) In the tree layer,the niche breadth from high to low in order for Choerospondias axillaris(0.716)>Cunning hamialanceolata(0.662)>Pinus massoniana(0.648)>Cyclobalanopsis glauca(0.551)>Liquidambar formosana(0.530)>Quercus aliena(0.447)>Camellia oleifera(0.164);species with large niche breadth was Cyclobalanopsis glauca(0.784), followed by Quercus fabri(0.683) and Pittosporum tobira(0.660) in the shrub layer;and Dryopteridaceae (0.751) and Carex tristachya(0.664)in the herb layer.(2)The niche overlaps of 24 main populations in the mixed broadleaf-conifer forest were all higher, niche differentiation is not obvious, the resources utilizing competition was strong.The communities stayed in the stages of succession, and the community composition was not stable.(3)The niche breadth of 24 main populations and its important valuehad a significant positive correlation (p<0.05), the correlation coefficients were 0.832,0.770 and 0.964.(4)The niche breadth and the important value of the coefficient of variation of 24 main populations showed a significant negative correlation(p<0.01), the correlation coefficients were-1.000.
subtropical forestniche breadthniche overlappingQingyanghu national park
NETL
NSTL
万方数据
维普
