Effects of Human Disturbance on Community Structure and Species Diversity of Bretschneidera sinensis Hemsl. in Fujian Province

In order to explore the effects of different human disturbance intensities on the structure and diversity of Bretschneidera sinensis community,six natural populations of B.sinensis in Fujian Province were selected as the research subjects. The intensity of interference was classified into five grades,the sample circle method was employed to analyze the species composition,community structure,and species diversity of the B.sinensis community under different levels of human disturbance. The results indicated that the diversity index of the arbor layer in the B.sinensis community was closely related to the intensity of disturbance. As the intensity of human disturbance increased,the number of species composition in the arbor layer significantly decreased. Shannon diversity index (H),and Simpson dominance index (P) all displayed significant declines,indicating damage to the community diversity. Although the number of regenerated seedlings of B.sinensis in the shrub layer increased following intensified human disturbance,sufficient populations of small and medium-sized individuals were not observed,thus the difficult situation of population renewal remained unchanged. Moderate human disturbance combined with the management and protection of seedlings may improve the difficulty of natural population regeneration of B.sinensis.