凤阳山白豆杉各群落区系组成和物种多样性的比较研究

在对凤阳山白豆杉种群进行野外调查的基础上，分析了其群落的区系及物种多样性．结果表明：凤阳山白豆杉群落中共有维管植物59科104属160种（含变种），其中蕨类植物5科6属8种，裸子植物4科7属8种，被子植物49科88属142种．区系成分复杂，大部分属于温带和热带分布类型，其中温带类型占总属数的58．95％，热带类型占36．84％．白豆杉分布的群落中常绿阔叶林的物种丰富度指数显著高于矮曲林和针阔叶混交林，优势度和多样性指数则是常绿阔叶林〉猴头矮曲林〉针阔叶混交林．在群落的垂直结构中，各多样性指数一般表现为灌木层〉乔木层〉草本层．

Study on flora composition and species diversity of Pseudotaxus chienii communities in Fengyangshan Nature Reserve

The vegetation data of Pseudotaxus chienii population forest in Fengyangshan Nature Reserve,Zhejiang Province,were used as the information for analyses of flora and species diversity.There are 59 families,104 genera,and 160 species,including 5 families,6 genera and 8 species of peridophyte,4 families,7 genera,and 8 species of gymnosperme,49 families,88 genera and 160 species of angiospermae.The floristicelements are complex,and the total of tropical distribution type amounts to 36.84 %.38.84% while the temperate elements amount to(58.95%).The population of P.chienii qrows most abundantly growed in the vegetation circle of road-leaved and coniferous mixed forests;dwarf forests and ever-green community.As the species richness,the index showed that the evergreen broad-leaved forests are much larger than broad-leaved and coniferous mixed forests and dwarf forests,while as the Simpson index and Shannon index,the indexes are evergreen broad-leaved forests>broad-leaved and coniferous mixed forests>dwarf forests.In the vertical structure of community,each index showed that shrub layer>tree layer>herb layer.