大鹏半岛山油柑+水竹果+鼠刺群落多样性

Diversity of Acronychia pedunculata+Garcinia oblongifolia+Itea chinensis community in Dapeng Peninsula

为了解深圳大鹏半岛保护区内植物群落的多样性状况,在自然保护区内设置1个100 m×100 m固定样方,分析植物群落物种组成、群落垂直结构多样性和物种多样性。经调查和统计,发现该群落共有植物175种,隶属于66科123属,其中以被子植物为主,共160种,蕨类植物共计12种,裸子植物3种。群落垂直结构分层明显,乔木层以山油柑(Acronychia pedunculata)、水竹果(Garcinia oblongifolia)和鼠刺(Itea chinensis)为主要优势种;灌木层以藤槐(Bowringia callicarpa)、金毛狗(Cibotium barometz)和九节(Psychotria asiatica)为主要优势种;幼苗层以团叶鳞始蕨(Lindsaea orbiculata)、思茅山橙(Melodinus cochinchinensis)和黑莎草(Gahnia tristis)为主要优势种。群落的物种多样性方面,不同生长型的物种丰富度规律呈现乔木层>灌木层>幼苗层,Simpson指数、Shannon-Wiener指数及Pielou均匀度指数则表现为灌木层>乔木层>幼苗层,各层次的指数数值均较高,且差异性较小,表明群落结构复杂且稳定,各层植物丰富,各物种的个体数量分布相对均匀。

In order to understand the plant community diversity in Dapeng Peninsula Nature Reserve,Shenzhen,a square quadrat of 100 m×100 m was established within the reserve to analyze plant community species composition,vertical structural diversity,and species diversity.The results revealed a total of 175 plant species in the community,be⁃longing to 66 families and 123 genera.Among them,there were mainly 160 species of angiosperms,12 spcies of ferns,and 3 species of gymnosperms.The community exhibited distinct stratification,classifiable into tree layer,shrub layer,and seedling layer.The tree layer was characterized by dominant species such as Acronychia pedunculata,Garcinia ob⁃longifolia,and Itea chinensis.The shrub layer featured predominant species like Bowringia callicarpa,Cibotium barometz,and Psychotria asiatica,while the seedling layer was dominated by Lindsaea orbiculata,Melodinus cochinchi⁃nensis,and Gahnia tristis.In terms of species diversity,the richness pattern among different growth forms followed the order of tree layer > shrub layer > seedling layer. Simpson index, Shannon⁃Wiener index, and Pielou index demonstrat⁃ed a trend of shrub layer > tree layer > seedling layer. The index values for each layer were relatively high, with small variations, indicating a complicated and stable community structure with a uniform distribution of individuals of different species.