庙岛植物多样性差异与原因探讨

Study on the Diversity of Plant Communities of Miaodao,Shandong

选择6个20m×20m的具有代表性的样地群落,调查与分析了样方群落内α多样性,群落间β多样性,以及比较了附近山体群落多样性的差异。结果表明:庙岛主要植被类型为刺槐林,黑松林以及6个典型群落。样地群落内共有38种植物,草本种类较多,反映出冬季需经历较长时间。群落间的乔木层与灌木层的Jaccard指数,Bray-Curtis指数均较低,异质性较高,对于外来物种需谨慎使用。灌木层的Margalef丰富度,Shannon-Wiener指数,Simpson指数,Pielou均匀度相对于乔木层较大,这与乔木层物种遮光能力有关。庙岛植物多样性较陆地山体植物群落多样性低,可能与演替阶段或生境差异有关。

The a diversity, β diversity and the difference of diversity between the Miaodao and. nearly mainland were conducted to study by investigating six representative plant communities in 20m X 20m. The result showed that the vegetation type of Miaodao consist of Robinia pseudoacacia, Pinus thunbergii and six typical associations. Herb plantsheld a greater proportion of 38 species on sample plot, which reflected that the plants suffered a long harsh weather. Both J accard index and Bray--Curtis index of tree and shrub＇s layer were low and heterogeneity of communities was high. Therefore, the exotic species should be used with caution. The Margalef richness indexes, Shannon--Wiener in- dex, Simpson index, Pielou evenness index of shrub＇s layer were higher than that of tree＇s layer because of the tree shading ability. The a diversity of plant communities in Miaodao is lower than nearly mainland, which is probably re- lated to the succession stage or habitat difference.