广西西大明山自然保护区观光木群落特征研究

Study on characteristics of Tsoongiodendron odorurn community in West Damingshan conservation area in Guangxi

调查了广西西大明山自然保护区观光木天然次生林观光木群落的物种组成、物种多样性、垂直空间分布,分析了观光木种群龄级结构。结果表明:(1)观光木群落植物种类丰富,共有维管束植物46科71属87种;(2)群落以木兰科的重要值最大,樟科排第二位,观光木和黄果厚壳桂为主要优势种;(3)群落空间各部分的Shannon-Wiener指数、Simpson指数、Margalef丰富度指数和均匀度指数排序均为灌木层>乔木层>草本层;(4)观光木种群各龄级结构总体趋于稳定,Ⅰ级小苗和Ⅱ级幼树数量较少。

The community species composition t species diversity,spatial distribution and age-class structure of Tsoongiodendron odorurn natural secondary forest in West Damingshan conservation area of Guangxi were investigated and analyzed.The results show that the community of T.odorurn is rich in species,with 87 species in 71 genera of 46 families of vascular plants.The highest importance value in the community falls on Magnoliaceae,followed by Camphoraceae,and the main dominant species are T.odorurn and Cryptocarya concinna.The Shannon-wiener diversity index,Simpson diversity index,Margalef diversity index and Simpson evenness index are all in the order of shrub layer>tree layer>herb layer.The age-class structure tends to be stable in the community,and the population of grade I seedlings and grade Ⅱ young trees are small.