九龙山自然保护区黄山木兰群落结构特征及其优势种群结构

Community Structure and Population Characteristics of Magnolia cylindrica at Jiulongshan National Nature Reserve

对浙江省九龙山国家级自然保护区黄山木兰(Magnolia cylindrica)的群落结构特征以及种群结构进行了调查研究。结果表明:黄山木兰群落植被具有热带向温带过渡的性质;群落主要伴生种为多脉青冈(Cyclobalanopsis multinervis);该群落具有明显的中亚热带常绿阔叶林特征,以高位芽占绝对的优势,叶的特征以中叶、纸质的单型叶为主;群落成层现象明显,可分为乔木层、灌木层和草本层;群落物种丰富度、多样性、均匀度都偏低;种群结构呈纺锤型,幼苗数量严重不足,种群有衰退的趋势;种群格局呈集群分布。

The community structure and the population characteristics of Magnolia cylindrica at Jiulongshan National Nature Reserve, Zhejiang province was investigated by sample plot method. The results showed that Cyclobalanopsis multinervis was the major associated species. The community had property of transitional zone from tropical to temperature one, indicating typical subtropical evergreen broadleaved forest. And the community was dominated by phanerophytes with mesophyll, single and herbaceous leaf. The vertical structure of the community could be divided into tree, shrub and herb layer. The richness, species diversity and evenness in M cylmdrica community were low. The age structure of the population was declining due to lack of seedlings. The spatial pattern of M. cylindrica population Was clump distribution.