海南万宁青皮林群落多样性特征研究

根据样方调查,对海南万宁青皮林群落的种类组成、外貌、结构特征和物种多样性进行分析。结果表明:(1)海南万宁青皮林自然保护区有维管植物137种,隶属于62科110属,其中热带性分布种达95.5%,群落属于热带雨林植被类型中的海岸单优青皮群落。(2)群落的优势种为青皮,外貌常绿,生活型以小高位芽为主(占35.04%),青皮种群表现为增长趋势。(3)群落的物种丰富度Magarlef指数为34.30,Shannon-Wienner指数为2.31,Simpson指数为0.99,均匀度Pielou指数为1.08。(4)群落各层次的丰富度表现为乔木层>灌木层>藤本植物>草本层,Simpson指数表现为灌木层>草本层>藤本植物>乔木层,Shannon-Wienner指数表现为灌木层>藤本植物>草本层>乔木层,均匀度表现为草本层>灌木层>藤本植物>乔木层,表明乔木层的物种丰富度最高,但分布最不均匀,优势种的优势地位突出。

Community Diversity of the Vatica mangachapoi Forests in Wanning, Hainan Islands

We used extensive fieldwork as the basis for studying the characteristics and species diversity of the Vatica mangachapoi community in Wanning V.mangachapoi Forests Natural Reserve.The results showed that:(1) 137 species in 110 genera and 62 families of vascular plants were recognized,and tropical elements predominated,making up of 95.5%.This community belongs to the sub-association coast single-dominant V.mangachapoi of the tropical rainforest.(2)The community is dominated by the tree specie V.mangachapoi and is characterized by evergreen Microphanerophytes(35.04%).The V.mangachapoi population is growing.(3) The species diversity of the community is relatively poor with the Margalef index of 34.30,the Shannon-Wienner index of 2.31,the Simpson index of 0.99 and the evenness index of 1.08.(4)The species richness index sequence of every layers of the community is tree layer>shrub layer>liana layer>herb layer,the Simpson index sequence is shrub layer>herb layer>liana layer>tree layer,the Shannon-Wienner index sequence is shrub layer>liana layer>herb layer>tree layer,and the evenness index sequence is herb layer>shrub layer>liana layer>tree layer.It showed that the species richness index of the tree layer is highest,but with the lowest evenness index,the status of the dominant specie is obvious.