两种干扰强度下岩生红豆天然群落特征及物种多样性分析

Analysis of species diversity and characteristics of Ormosia saxatilis natural community under two different intensities of disturbance

【目的】研究两种干扰强度下岩生红豆天然群落结构与物种多样性特征,为其群落保护、物种多样性保育和可持续利用提供理论依据。【方法】采用常规群落学调查方法,设置6个典型群落样地,统计物种丰富度指数、Shannon-Wiener和Simpson生物多样性指数及Pielou均匀度指数值,分析两种干扰强度下群落结构与物种多样性特征。【结果】研究区岩生红豆各个群落皆以高位芽植物为主,以热带成分略占优势;黔灵山3个样地群落有维管植物29种,隶属25科26属,笔架山3个样地群落有维管植物74种,隶属40科59属,两地群落各层物种丰富度和多样性程度亦有较大差异。【结论】强干扰型对黔灵山岩生红豆群落结构和物种多样性影响较大,致使其更新层不发达,不利于岩生红豆的繁育更新;而弱干扰型对笔架山岩生红豆群落的影响较小,其更新层发达,有利于群落岩生红豆的更新演替。

[Objective]Natural community structure and species diversity characteristics in Ormosia saxatilis fiehl un- der two different intensities of disturbance were studied to provide theoretical references for community protection, conser- vation and sustainable utility of species diversity. [Method]By using conventional coenology investigation method with six typical community plots, the characteristics of species diversity of Ormosia saxatilis communities under two differcnt inten- sities of disturbance were analyzed based on species richness index, the Shannon-Wiener and Simpson biodiversity index, and the pielou evenness index. [Result]The plant of phanerophytes occupied the plots communities of the two places, and the tropical ingredients had a slight advantage. There were 29 species of vascular plants, belonging to 25 families and 26 genera in the Qianling hill community plots. And there were 74 species of vascular plants, belonging to 40 families and 59 genera in the Bijia hill community plots. In addition, the corresponding layers of species richness and diversity in the plots communities were different under the different types of interference. [Conclusion ]The strong interference types have greater impacts on the community structure and species diversity in the Qianlin hill Ormosia saxatilis community, and hinder the levels of communities update, thus it is not in favor of the regeneration and succession of the Ormosia saxatilis community ; While, the weak interference types have little impact on the Bijia hill Ormosia saxatills community, and help update the levels of communities, accordingly it is helpful for the renewal Ormosia saxatilis communities.