Community characteristics and diversity of Pterostyrax psilophyllus in Nangong Nature Reserve,Taijiang County,Guizhou Province
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.
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