鼢鼠土丘植物群落恢复演替过程中物种-多度分布格局的变化

Species abundance distributions(SADs) contain more information about community structure than the single biodiversity index. In this paper we examined the SADs in different stages of succession in plateau Zoker mounds.And we tested whether the SADs fitted the geometric seriers, log-seriers, Hubbel model, broken sticks , normal distribution , power fraction and random assortment models. In this reserch we use SADs and biodiversity index to illustrate the biodiversity of this plant community. We found that only geometric seriers can fit the community in most stages, Hubbel model, power fraction, log-seriers can not fit any communitys in any stages and random assortment, broken sticks, normal distrubution can fit the communitys in early stages. This result indicate a niche based community assembly in this plant commuinity. And the allocation of resourses is not random. With the succession the value of biodiversity be larger and in stage 6 the value decrased slightly.This phenomenon can be explained by medium interference theory. The SADs indicate more accurate evenness of communities.