中国中亚热带东部常绿阔叶林主要类型的群落多样性特征

COMMUNITY DIVERSITY OF THE MAIN TYPES OF THE EVERGREENBROADLEAVED FOREST IN THE EASTERN PART OF THE MIDDLE SUBTROPICAL CHINA

本文通过１０个地区６１个样地资料分析，研究了中亚热带东部常绿阔叶林群落多样性特征及其随纬度、海拔梯度的变化。结果表明，中亚热带东部常绿阔叶林群落丰富度为４９±１７种（样地面积４００ｍ２），各层次的多样性表现为灌木层（包括幼树与幼苗）＞乔木层＞草本层。常绿阔叶林各类型间的差异远比落叶阔叶林与多样性较低的常绿阔叶林之间的差异大。各层次中变化幅度从大到小的顺序为：草本层＞乔木层＞灌木层。在所研究地区常绿阔叶林的群落多样性没有表现出明显的随纬度梯度和海拔梯度的变化规律。

Community diversity and its patterns along latitude and altitude were studied based on 61 plot samples of evergreen broadleaved forests from 10 areas in the eastern part of the middle subtropical China. The results showed that community richness was 49±17 species, with a diversity order of the shrub layer(including tree seedlings and saplings)>tree layer>herb layer. The difference in species richness and in diversity between different evergreen broadleaved forests is far greater than that between temperate deciduous forests and speciespoor evergreen forests. Diversity variation among the communities was higher in herb layer than in tree layer, and in turn than in shrub layer. There was little change in community diversity along latitude and altitude in the research area of the eastern subtropical China.