浙江九龙山自然保护区长序榆群落结构特征研究

应用样方调查的方法,分析了长序榆群落的种类组成、群落外貌、垂直结构、水平结构以及种群动态.结果表明,该群落物种丰富度、多样性、均匀度都偏低,而优势度相对较高,说明该群落物种单一且不稳定;群落中种群的分布格局除长序榆是聚集分布外,其余种群均为随机分布;长序榆更新严重受阻,种群明显处于衰退期;群落的生活型、叶的特征显示出中亚热带常绿阔叶林的特点;群落的垂直分层明显,可明显分为乔、灌、草3层,群落的垂直结构呈纺锤型,表明群落更新不良.最后,对长序榆种群的保护提出了建议.

Stuctrure features of Ulmus elongate community in Jiulongshan National Natural Reserved Area

Based on the data collected from sample plots with an area of 600 m2,the species composition,physiognomy,spatial structure and dynamic of Ulmus elongate community in Jiulongshan National Natural Reserved Area,Zhejiang Province,were analysed.The results showed that the abundance,evenness index,diversity of the species in the U.elongate community was lower,but ecological dominance was higher,meaning the community was unstable.The horizontal spatial patterns of 6 dominance populations conformed to random distribution except U.elongate.The tree layer can be easily divided into three sublayers in terms of height.Characteristics of plant life-form and leaf indicated the character of the subtropical evergreen broad-leaved forest.The regeneration of U.elongate was badly poor and the population was declining due to lack of seedlings.At last,protection measures were proposed.