【摘要】 为了解白辛树(Pterostyrax psilophyllus Diels ex Perk)群落结构特征和多样性状况，更好地保护和利用白辛树资源，采用样地调查的方法对白辛树进行调查。结果表明：白辛树群落有植物37科52属66种(含种以下等级),其中种子植物37科52属66种。在种子植物中，裸子植物2科4属4种；被子植物35科48属62种。白辛树群落物种组成以樟科、无患子科为优势科，群落物种较多、物种组成较复杂；植物区系科、属成分均为热带性质占优势。本群落乔木层重要值白辛树最大，为建群种，云贵鹅耳枥、青榨槭次之，为优势种；灌木层以狭叶方竹最大，分布密集，是优势种；草本层以竹叶草最大，为优势种。白辛树种群从Ⅰ级至Ⅳ级都有分布，各龄级呈现“两头多，中间少”的结构，白辛树开花结实正常，更新良好，幼苗、幼树数量较多，是增长型种群。群落丰富度指数为灌木层>乔木层>草本层；优势度指数为草本层>乔木层>灌木层；H多样性指数为乔木层>草本层>灌木层；均匀度指数为草本层>乔木层>灌木层。说明灌木层物种丰富度最明显；草本层优势度最明显；乔木层H多样性指数最高，草本层次之；草本层均匀度指数最大，乔木层次之。白辛树是一个对生境要求较为苛刻的树种，加强对其生境的保护尤为重要。更多还原

【Abstract】 In order to understand the community structure and diversity of Pterostyrax psilophyllus Diels ex Perk, we investigated the Pterostyrax psilophyllus community in Nangong Nature Reserve by plot method.The results show that there are 66 species of 52 genera and 37 families in the community, including 66 species(52 genera and 37 families)of seed plants.Among the seed plants, there are 4 species, 4 genera and 2 families of gymnosperms, and 62 species, 48 genera and 35 families of angiosperms.The community is dominated by Lauraceae and Sapindaceae, with many species and complex species composition.The floristic families and genera are tropical.In the community, Pterostyrax psilophyllus has the highest important value in the tree layer, which is the establishment species, followed by Carpinus pubescens and Acer davidii.In the shrub layer, Chimonobambusa angustifolia is the dominant species.In the herb layer, Oplismenus compositus is the dominant species.The population of Pterostyrax psilophyllus distributes from grade Ⅰ to grade Ⅳ.The population of Pterostyrax psilophyllus is a growth type, with normal flowering and fruiting, good regeneration, and a large number of seedlings and saplings.Community richness index: shrub layer > tree layer > herb layer.Dominance index: herb layer > tree layer > shrub layer.H diversity index: tree layer > herb layer > shrub layer.Evenness index: herb layer > tree layer > shrub layer.The species richness of the shrub layer is the most obvious.The dominance of the herb layer is the most obvious.The H diversity index of the tree layer is the highest, followed by the herb layer.The evenness index of the herb layer is the highest, followed by the tree layer.Pterostyrax psilophyllus has strict requirements for habitat, and it is very important to strengthen the protection of its habitat.更多还原