中文摘要：

利用1 hm2固定样地数据,分析湖南省长沙县大山冲国有林场石栎-青冈群落的种类组成、群落结构及区系特征.结果表明：群落中胸径≥1 em的植物共38科55属73种,常绿种（50.68％）和落叶种（49.32％）所占的比例相当,没有大型木质藤本;壳斗科重要值最大,达35.94,是群落的优势建群科;植物种数、个体数量、胸径级和高度级呈倒“J”型分布,表明群落垂直结构的层次分化明显,结构稳定,更新良好;该群落具有典型亚热带区系性质,与日本森林植物群落具有极大的相似性,属于东部典型常绿阔叶林的石栎-青冈群系组,起源应不迟于第三纪.

英文摘要：

In this study, floristic composition, community structure, and phytogeographic characteristics in a Lithocarpus glaber- Cyclobalanopsis glauca forest community were investigated in a 1 hm2 permanent plot （100 m × 100 m） located in Dashanchong state-owned forest farm （ 113° 17＇46” - 113° 19＇8”E, 28°23＇58” - 28°24＇58”N）, Changsha County, Hunan Province. The results showed that plants with diameter at breast height （DBH） larger than 1 cm in the plot belonged to 73 woody species, 55 genera, and 38 families. Evergreen broadleaved and deciduous tree species shared a similar proportion of composition （ i. e. evergreen broadleaved 50.68% and deciduous 49.32% ） , but no large woody vines were found in the forest community. Fagaceae had the highest important value （35.94） and was the most dominant family in the community. The distribution of plant individuals, species, DBH classes, and height classes all displayed a reverse ＂J＂ pattern, indicating the apparent vertical canopy stratification and good understory regeneration in the forest community. The flora had the typical characteristics of subtropical flora with extreme similarity with the forest community in Japan and belonged to L. glaber- C. glauca formation group of typical evergreen broadleaved forest in the eastern region, China. The origin time of the forest community should not be later than the tertiary period.