福建永定县笔架山桫椤群落物种多样性研究

Studies on Species Diversity of Alsophila spinulosa Community in the Bijia Mountain of Yongding, Fujian

对福建省永定县笔架山桫椤群落的不同样地、不同层次的物种丰富度、物种多样性指数和群落均匀度进行了分析。结果表明 :在群落垂直结构的 5个层次中 ,桫椤的物种多样性除物种丰富度外其他各项指标在各层次中是最大的 ;草本层的物种丰富度、多样性指数和种间相遇机率分居第 2位 ,群落均匀度则居第 3位 ;灌木层的物种丰富度居第 1位 ,但群落均匀度最小 ;乔木层第 1亚层的物种多样性各项指标除群落均匀度居第 2位外 ,其他均最小 ;藤本的物种多样性各项指标要么居第 3位 ,要么居第 4位。样地间 ,乔木层、灌木层的各项多样性指标差异较小 ,草本层和藤本的差异较大。结果还表明 :永定桫椤群落的 Sim pson指数和种间相遇机率 (PIE)

This paper analysed the species richness, species diversity index and community evenness in different plots and layers of Alsophila spinulosa community in the Bijia Mountain of Yongding, Fujian Province. The results show that the species diversity indexes of Alsophila spinulosa are biggest in the five layers of community vertical structure, except species richness. The species richness and diversity index of herb layer are the second, and the community evenness is the third. The species richness of shrub layer is the first, and the community evenness is the smallest. The species diversity indexes of the first sub layer of tree layer, except the community evenness is the second, are the smallest. The diversity indexes of vine are the third or the fourth. The diversity indexes of tree layer or shrub layer or herb layer among various plots are somewhat different. Relatively, the differences of tree layer or shrub layer are small while differences of the herb layer and vine are comparatively big. The result also shows that the values of the Simpson's index and the interspecific encounter probability are almost equal in Alsophila spinulosa community.