【摘要】 湖南省南岳的水丝梨林即水丝梨 +甜槠 -尾叶山茶 +花竹 -蔓赤车群丛是一种尚未报道的新群落类型。研究了该群落的区系特点、生活型、层次结构、更新演替、物种多样性及其物种相对多度分布格局 ,该群落物种多样性水平接近山地季雨林。更多还原

【Abstract】 According to the results of the investigation and statistic analysis of Sycopsis sinensis forest in Nanyue, Hunan Province, this community is a new type which hasn’t been reported can be called Association of Sycopsis sinensis+Castanopsis eyeri-Camellia caudata+Phyllostachys nidularia-Pellionia scabra . The community has 149 species and 116 genera that belong to 69 families of the vascular plants. The tropical elements of the areal type genera in the community occupies 56 19% of the total, but the temperate one 43 81% . The floristic elements of the species in the community are mainly Cathysian, Sino Japan, East Asia and East China Central China which occupy 24 16%, 16 78%, 13 42% and 12 08% of the total respectively. It is very obvious that the floristic elements of East China and Central China cross at the species of the community. The wood plants in the community occupy 71 14% of the total, but the herb 28 86%, which the Therophyte and Perennial plants occupy 6 04% and 22 82% of the total respectively. The community can be divided the arbor,shrub and herb layer, which layer of arbor and shrub can be further divided 3 sub layers, it is the evergreen broad leaved forest of the central subtropical of China. The community still keep the evergreen broad leaved forest to regard Sycopsis sinensis as the dominant species, but Castanopsis eyeri as the sub dominant species in the successive probably replaced by Cyclobalanopsis multinervis, Photinia beauverdiana and Lithocarpus henryi . We choose 24 formulae from these indices of the species diversity, and use the important value, individuals or fresh weight and dominance or coverage to study the plant species diversity of Sycopsis sinensis forest in Nanyue, Hunan Province. The results show that the plant species diversity of the forest community is higher and approaches the diversity level of the mountainous seasonal rain forest, and that the different measurement degrees have no great influence upon species diversity indices i. e. Its values have not the obvious law by using different measurement degree to calculate the indices of species diversity. We choose 4 models of distributional pattern of species relative abundance i. e. Geometric series distributional, Broken stick, Log series distributional and Log normal distributional to study the distributional pattern of species relative abundance of Sycopsis sinensis forest in Nanyue, Hunan. The results show that Log series distributional model is suitable for imitating the distributional pattern of the plant species relative abundance of the arbor layer and shrub layer of the community, and Borken stick model is only suitable for imitating the arbor layer, and Log normal distributional model is only suitable for imitating the herb layer, and Geometric series distributional model isn’t suitable for imitating any layer of the distributional pattern of the plant species relative abundance of the community of Nanyue, Hunan. Besides, the value of α index of the community approaches the diversity level ofmountainous seasonal rain forest.更多还原