【摘要】 采用相邻格子样方法,分别对鄂西北竹山县和谷城县红椿天然群落的乔灌草层物种多样性进行研究,结果表明:红椿为群落优势种和建群种;竹山群落Shannon-Wiener指数、Simpson指数和均匀度分别为:灌木>草本>乔木;谷城Shannon-Wiener指数:草本>灌木>乔木,而Simpson指数和均匀度为:灌木>草本>乔木.谷城群落Shannon-Wiener指数、Simpson指数和和均匀度相对均略高于竹山.2个群落乔木层物种多样性差异显著,灌木层间差异不显著,草本层间差异极显著.不同群落内物种组成和多样性水平,在生境异质性下形成结构上的差异.更多还原

【Abstract】 With quadrat-juxtaposing grid sampling method,the diversities of trees,shrubs and herbs were respectively studied in the natural T.ciliata communities in Zhushan county and Gucheng county in the Northwest of Hubei.The results showed that Toona ciliata was dominant and constructive species in the communities.The Shannon-Wiener index,Simpson index and evenness of Zhushan community were:shrub>herb>tree.In Gucheng community the Shannon-Wiener index was:herb>shrub>tree,while the Simpson index and evenness were:shrub>herb>tree.The Shannon-Wiener index,Simpson index and evenness of Gucheng community were slightly higher than those of Zhushan’s.Of the 2 communities,the difference of species diversity of tree layers was significant,and the difference between shrub layers was not significant,while which difference of 2 shrub layers was insignificant.The species composition and diversity levels in different communities formed the structural differences under the condition of habitat heterogeneity.更多还原