Species Diversity and the Relationship with Habitat Community Characteristics of Impatiens hainanensis,Endemic to Hainan Island
The study was to research the distribution pattern of community vegetation, Impatiens hainanensis, an endemic species to Hainan Island with reasonable environmental interpretation. At the same time, the ecological relationship between population size and species diversity under different associations were also investigated. The results showed that:(1)Consistent with the results of DCA sorting, the 16 samples were divided into four types of association by TWINSPAN classification;(2)DCA sorting reflected the relationship between each association type and environmental factor, the first ordination axes mainly indicated the change of altitude gradient, the second ordination axes mainly implied the change of canopy density gradient;( 3)Both species diversity index and richness index differed not only from associations but also in layers. This endemic species, I. hainanensis, cluster in different community was closely related to the formation of the association and environmental factors. In addition, the altitude is the environmental factor that affect the distribution pattern and species diversity;( 4)Population sizes varied with seedling regeneration ability under different community structure, which indicated that appropriate measures should be taken to protect different populations of I. hainanensis. in Hainan island.