海南岛甘什岭棕榈藤伴生群落特征及排序分析

棕榈藤是一种重要的非木质森林资源，在全球生物多样性保护和经济发展方面起着重要的作用，为了解棕榈藤伴生群落特征及其对棕榈藤种群数量的影响，本研究应用样方调查和排序分析法，对海南岛甘什岭5个棕榈藤种的伴生群落物种组成、物种多样性及其对棕榈藤种群数量影响进行研究。在20个面积为400 m2的样方中，共记录维管植物192种，隶属63科140属。群落植物以大戟科(Euphorbiaceae)、樟科(Lauraceae)和茜草科(Rubiaceae)等为数量优势科，热带科优势明显，建群种为龙脑香科(Dipterocarpaceae)的铁凌(Hopea reticulata)和青皮(Vatica mangachapoi)；群落物种丰富度和多样性均以乔木层(54，2.89)最高，草本层(8，1.68)最低。均匀度指数以草本层(0.84)最高，灌木层(0.65)最低；DCA和RDA排序结果表明，除黄藤(Daemonorops jenkinsiana)外，其余4种棕榈藤与群落优势种关系密切，群落多数物种多样性因子抑制杖藤(Calamus rhabdocladus)种群多度，层间植物多样性促进黄藤和多果省藤(Calamus walkeri)种群发展，乔木层、灌木层和草本层物种多样性促进白藤(Calamus tetradactylus)和小钩叶藤(Plectocomia microstachys)多度增加。建议加强对甘什岭棕榈藤伴生群落的生境、重要伴生植物和群落物种多样性保护，以促进棕榈藤种群更新繁衍。

Community Characteristics and Ordination Analysis of Rattan and Its Asociated Species in the Communities in Ganshenling,Hainan Island

Rattan is an important non-wood forest resource in the world that plays an important role in global biodiversity conservation and economic development. In order to reveal the species composition, species diversity of five rattans and its associated species in the communities, using the quadrat survey procedure and ordination analysis method, the species composition and species diversity of rattan and its associated species in the communities in Ganshenling, Hainan Island was analysed, meanwhile, the influences on the population quantity of rattans was studied too. The results were as follows: The vascular plant species belonged to 63 families, 140 genera and 192 species in 20 plots that each with an area of 400 square meters. Quantitativedominant families in thecommunity were tropical Euphorbiaceae, Lauraceae, and Rubiaceae.  The major dominant species of community composition were Hopea reticulata and Vatica mangachapoi in Dipterocarpaceae. Analysis of the species diversity showed that the tree layer had the highest species richness and diversity index in the communities of rattan and its associated species, and the herb layer had the lowest one. Besides, the herb layer had the highest evenness, and the shrub layer had the lowest one. The results of DCA and RDA showed that all the rattan was closely related to the dominant species of the community, except for Daemonorops jenkinsiana. In the community, species diversity in most levels inhibited the population abundance of Calamus rhabdocladus. The diversity of interlayer plants promoted the growth of Daemonorops jenkinsiana and Calamus walkeri. Species diversity of the tree layer, shrub layer and herb layer could facilitate the increase of the abundances of Calamus tetradactylus and Plectocomia microstachys Attention should be payed to the protection of the habitat and species diversity of rattan and its associated species in the communities to promote regeneration of rattans and succession of associated communities.