作 者 ：陈明林;刘登义*;崔淑卿;刘雪云
期 刊 ：植物研究 2007年 27卷 4期 页码：484-493
关键词：六股尖自然保护区；种子植物多样性；区系；PCA；保护对策；
Keywords:Liugujian, seed plants diversity, flora, PCA, protection strategy,
摘 要 ：六股尖自然保护区是皖南山区中亚热带植被带的重要组成部分，其种子植物多样性丰富，具有种子植物134科，529属，994种，有珍稀保护植物35种，是一个天然的物种基因库。区系成分复杂，起源古老，南北成分过渡明显，替代性分布比较突出。属的分析显示529属可归为14个分布区类型，并与世界各地有广泛联系，温带分布占56.9%，热带分布占40.0%，其R/T（热带成分比温带成分）比值为0.70，比黄山（0.57）、清凉峰（0.53）、天堂寨（0.51）略高，与齐云山（0.77）相近，显示其热带性比黄山、清凉峰、天堂寨略强，与齐云山相似。植被分布从下至上依次为农耕林（次生）(海拔700 m以下)、常绿落叶阔叶混交林（700～1 100 m）、落叶阔叶混交林（1 100～1 300 m）、山地灌丛（1 300～1 500 m）、高山草甸（1 500 m以上）。其代表性植被常绿落叶阔叶混交林，群落多样性分析表明，其Simpson指数为8.82±2.70，Shannon-Wiener多样性指数为2.62±0.27，种间相遇机率PIE为0.88±0.05，群落均匀度R为0.78±0.07，显示该群落物种多样性丰富，分布均匀，结构稳定。通过PCA排序可以将六股尖等21个山地划分为华南、华北、华东三大植物区系。为保护和修复该地的常绿阔叶林、中亚热带常绿落叶阔叶混交林以及一些重要的珍稀濒危植物资源如华东黄杉林等，提出了一些相应的保护措施。
Abstract:Liugujian Nature Reserve (LNR hereafter) is a vital part of middle subtropical vegetational zone in the mountainous region in South Anhui. It is an inartificial species gene store, with 994 species of seed plants in 529 genera of 134 families and 35 rare conserved plants. The floristic elements, whose origin is ancient, are complex, with many ancient families and genera as well as many relic species. Many southern and northern floristic components are found in LNR, which shows that it is a transitional region, and the vertical and horizontal vicarism is obvious. According to the geographic distribution of 529 genera, they can be categorized into 14 distribution types, which shows the flora is correlated widely with that of the world. The ratio of R/T is 0.70, with 56.9% temperate elements and 40.0% tropical elements, so it is slightly higher than that in Huangshan Mountain (0.57), Qingliangfeng (0.53) as well as Tiantangzhai (0.51), and is similar to that in Qiyun Mountains (0.77), which shows there exists higher tropical character than that in Huangshan Mountain, Qingliangfeng, Tiantangzhai, and has similar character to Qiyun Mountains. The vertical zonation of vegetations is conspicuous, and the vegetations from base belt to top belt are arranged in turn as follows: agriculture-cultivated belt (below the elevation of 700 m), mixed evergreen-deciduous broadleaved forest belt (700~1 100 m), deciduous broadleaved forest belt (1 100～ 1 300 m), mountain shrubbery belt (1 300～1 500 m) and alpine meadow belt (above 1 500 m), among which the typical vegetation is mixed evergreen-deciduous broadleaved forest belt, whose diversity indices are as follows: Simpson index is 8.82±2.70，Shannon-Wiener index is 2.62±0.27，PIE index is 0.88±0.05 and evenness index is 0.78±0.07, which shows that the species diversity of the community is rich, with uniform species distribution and stable structure. Based on the ordination of PCA, 21 floras are grouped into South China, East China and North China flora, respectively. In order to protect and restore the evergreen broadleaved forest, middle subtropical evergreen-deciduous broadleaved forest and some rare, endangered plants such as Pseudotsuga gaussenii, et al. more efficiently here, some protection measures are proposed in present paper.