【摘要】 根据鼎湖山自然保护区 1 6个植物群落的样地调查资料 ,从种丰富度和不同类型的物种多样性指数、均匀度与植被类型、人为干扰程度、演替阶段等方面的关系进行了分析。本区植被类型的多样性指数、均匀度指数变化反映了其结构复杂程度、生境的差异。物种丰富度和多样性随着人为干扰程度的增强而降低。群落内各层的物种丰富度的大小的顺序为“灌木层 >草本层 >乔木层”,而群落多样性指数的大小顺序为“灌木层 >乔木层 >草本层”。群落多样性随群落演替发展而增高 ,但最稳定群落的多样性不是最高。物种重要值和株数作为测度指标计算群落多样性所得结果相近 ,与用覆盖度(冠幅面积 )作为测度指标计算的结果相差较远。 Shannon-Wiener指数在样地达到一定面积后趋于稳定 ,Simpson指数较之 Shannon-Wiener指数对样地面积更敏感更多还原

【Abstract】 The species richness, evenness and species diversity of plant communities in Dinghushan Nature Reserve were investigated. The species richness index, species diversity index and the evenness index were compared for different vegetation types. The indices increased with the plant community succession, but the indices of mature forest were not the highest. Generally, the species richness order was that the shrub layer>herb layer>tree layer, the diversity index order is that the shrub layer>tree layer>herb layer and the evenness order is that the tree layer>shrub layer>herb layer. The results are similar when Ⅳ(important value index) or individuals were used to measure community diversity and they are different with the results when the species coverage was used. The diversity indices did not show close relationship with plot area, especially Shannon Winner index, it is stable when the plot area reaches certain size.更多还原