星斗山花板溪流域森林群落物种组成及多样性垂直分异

Vertical Differentiation of Species Composition and Biodiversity in the Forest Community of Huaban Basin in Xingdou Mountain

基于沿海拔梯度设置的12个样地的调查资料,分析星斗山花板溪流域森林群落物种多样性沿海拔梯度的变化规律.结果表明:所有样地中DBH≥1 cm的木本植物共82种995株,隶属于36科63属,其中常绿树种33种449株,落叶树种49种546株,针叶树种仅5种57株.随着海拔升高,植被型由温性针阔叶混交林过渡为常绿落叶阔叶混交林.5个α多样性指数均在海拔1000~1200m范围达最大值,随后整体随海拔升高逐渐下降.β多样性指数沿海拔上升整体呈下降趋势,各群落的物种组成沿环境梯度的替代速率逐渐降低.各海拔梯度间的Jaccard群落相似性均呈中度不相似或极不相似.

Based on data from 12 plots surveyed along the altitude in the Forest Community of Huaban Basin in Xingdou Mountain,we analyzed the variation of species diversity in different altitude.The results showed that：There are 82 species,63 genera and 36 families,995 individuals in total whose diameter at breast height（DBH） ≥1 cm.The evergreen tree species account for 449 individuals,33 species.Another 546 individuals are deciduous trees,belonging to 49 species.Only 5 species,57 individuals are coniferous species.With the elevation increasing,there is a transition in vegetation type from temperate coniferous and broad-leaved mixed forest into evergreen and deciduous broad-leaved mixed forest.All the five α diversity indexes increased to their highest at the altitude from 1 000 m to 1 200 m and then gradually decreased in general with increasing altitude.The β diversity of each community showed a downward trend as the elevation increases.The substitution rates of species composition between communities in different environmental gradients decreased gradually.The coefficient of community similarity of Jaccard between elevation gradient showed moderate dissimilarity and extremely dissimilarity.