南岭大顶山常绿阔叶林群落结构及其物种多样性

Community structure and species diversity of the evergreen broadleaf forest in Nanling Dadingshan Nature Reserve

南岭国家级自然保护区位于欧亚大陆东南部的亚热带和热带区域,是广东省天然的绿色屏障。根据在南岭大顶山建立的1hm2生物多样性监测研究永久样地的调查,对样地所在的植物群落的结构、物种组成和植物物种多样性进行了分析研究。结果表明,该群落属于中亚热带常绿阔叶林,应称为华润楠(Machiluschinensis)、仁昌厚壳桂(Cryptocaryachingii)-山羡叶泡花树(Meliosmathorelii)群落。该群落结构复杂,各层次的代表种类明显。植物物种多样性丰富,特别是乔木层(DBH>1CM)的1hm2物种数达163种,高于亚热带其它地区的森林群落。各个层次中,以层间植物的多样性指数最高,乔木层次之,草本层最低。究其原因是层间植物的均匀度指数较高。因此,该森林群落具有重要的保护价值,应该加强其物种维持机制的深入研究。

A plot (100m×100m)was set up in the evergreen broad-leaved forest in Nanling Dadingshan Nature Reserve for long-term monitoring of the plant biodiversity. On the basis of investigation to each, this study examined the physiognomy, structure, florists, species diversity of the community for all plants with DBH>1 cm, and all shrub and herbs in 25 auadrates (5m*5m) within the plot. The results showed that the forest have characteristics of rich in species of Lauraceae and Fagaceae. and should be named of “Machilus chinensis、Cryptocarya chingii and Meliosma thorelii community”. There are rich species diversity in the community, especially for the tree layer (DBH>1cm). Results further suggests that, the community has high conservation values and should be studied for the mechanism of rich species biodiversity.