粤北南方红豆杉植物群落的物种多样性和种群格局

在用样方法取样的基础上 ,分析粤北南方红豆杉生长地植物群落的物种多样性和种群分布格局 ,结果表明 :在调查地南方红豆杉出现于 5种类型的群落中 ;从物种多样性指数的平均值来看 ,灌木层的物种多样性大于乔木层 ,但乔木层和灌木层之间的 Shannon指数和群落均匀度无明显的差异 ;从乔木层和灌木层的变异系数看 ,丰富度、Shannon指数和群落均匀度均表现为乔木层 >灌木层。所调查的南方红豆杉生长地的植物群落的多样性指数和均匀度高于其他类群的南亚热带常绿阔叶林 ,但低于海南岛的热带雨林类群。南方红豆杉生长地植物群落中各优势种群均呈集群分布 ,且集群强度也都较高。南方红豆杉种群在大多数样地中亦呈集群分布

Research on the communities with Taxus mairei in North Guangdong province:species diversity and population pattern

The species diversity and population pattern of the communities with Taxus mairei in North Guangdong province were studied based on the vegetation survey. The results showed that there were 5 types of the communities with Taxus mairei,which species diversity of the shrub layer was higher than those of the tree layer,but there were no significant difference in the Shannon diversity index and evenness;The variation coffeciency of different community layers measured by Shannon index,richness and evenness was tree layer>shrub layer. The diversity index and evenness of the woody plant in the communities with Taxus mairei were higher than those of other evergreen broad-leaf forest communities in the neighbouring regions,but lower than those in the tropical rain forest communities in Hainan Island. The distributive pattern of the dominant populations in the communities with Taxus mairei was belonged to the clumpy distribution,and their intensities were high.The distributive patterns of Taxus mairei populationin in most of quadrats were clumpy distributed.