生态环境学报2022，Vol.31Issue(1)：17-25,9.DOI:10.16258/j.cnki.1674-5906.2022.01.003
南亚热带森林3层次物种多度之广义泊松分布模型
Using Generalized Poisson Distribution to Model the Patterns of Species Abundances in Three Layers of South Subtropical Forest
摘要
Abstract
The species abundance distribution (SAD) in a biological community showed typical inverse J-shaped pattern, and the SAD modelling study was contributed to solve practical problems such as the species configuration in forest ecological restoration. This study examines whether a discrete distribution with over-dispersion (i.e., variance>mean), the generalized Poisson (GP) distribution with two parameters, λ and α, can describe the SAD pattern, and whether its parameters are related to community species diversity by using the data from the three layers of a lower subtropical mixture forest in Dinghushan Biosphere Reserve, South China. The results showed that the observed SADs for all three layers of the forest showed similar inverse J-shaped distribution curves and followed the zero-truncated GP, with significantly decreasing λ and slightly increasing α from the tree, shrub to herb layer in the community. The parameter α better reflected the species diversity than λ, and thus the former could serve as a measure of the species diversity in a community. Comparisons between the GP and the Poisson lognormal (PLN) distribution showed that the former better fitted the SAD datasets than the latter for three layers. Therefore, the GP better estimated the potential species richness in the community. The GP distribution was more suitable to model the observed SAD with over-dispersed count data than the PLN, and thus the former might have a wider application prospect than the latter, especially in the estimation of the potential species richness in a community as well as on a local or regional scale and the determination of the species proportion for ecological restoration of degraded forests.关键词
物种多度分布/广义泊松分布/泊松对数正态分布/森林层次/最大或然法Key words
species abundance distribution (SAD)/generalized Poisson distribution/Poisson lognormal distribution/forest layers/maximum likelihood method分类
农业科技引用本文复制引用
殷祚云..南亚热带森林3层次物种多度之广义泊松分布模型[J].生态环境学报,2022,31(1):17-25,9.基金项目
Provincial Major Project of Education Department of Guangdong Province,China(2016KZDXM002) （2016KZDXM002）
