长苞铁杉林林隙内外群落多样性及稳定性

采用Margalef丰富度指数(R)、Shannon-Wiener多样性指数(H)、Pielou均匀度指数(E)、均优多指数(Z)、生态优势度指数(λ)及群落优势度指数(C)分析长苞铁杉林林隙与非林隙物种多样性;用改进的M.Godron稳定性测定方法测定群落的稳定性.结果表明:长苞铁杉森林群落林隙以个体数为基础的Margalef丰富度指数(R)、Shannon-Wiener(H)指数及均匀度(E)明显高于非林隙各项物种多样性指数;以重要值为基础计算的Shannon-Wiener指数(H)及均优多指数(Z)也是林隙高于非林隙;林隙植物群落均优多指数(Z)显著高于非林隙,而生态优势度(λ)和群落优势度(C)又明显低于非林隙,表明林隙的存在增加了群落物种多样性,但同时也降低了群落的稳定性,且这一结果与M法所测的群落稳定性结果相一致,M法结果也表明整个森林群落处于典型的亚稳定状态.

The species diversity and stability of Tsuga longibracteata forest gaps and non-gaps

The species diversity and community stability of gaps and non-gaps in Tsuga longibracteata forests were studied by using Margalef richness index(R), Shannon-Wiener index(H), Pielou evenness index(E), evenness-dominance-abundance index (Z),ecological dominance(λ), community dominance(C) and Zheng yuanrun′s M.Godron method. The results showed that the R,H and E calculated by individuals numbers in gaps were higher than that of non-gaps. The H and Z of gaps calculated by importance value were also higher than that of non-gaps. While the λ and C of gaps were lower than that of non-gaps. It suggested that species diversity of the community increased and community stability decreased due to the existence of gap formed by natural disturbance. And the results of community stability calculated by M method accorded with the above results. The whole forest community was in typical substability state.