金佛山自然保护区中国种子植物特有属

在野外调查和数量系统分析的基础上,对金佛山自然保护区的中国种子植物特有属进行了研究。结果表明,金佛山自然保护区分布有中国种子植物特有属51个,占该区种子植物属总数的4·59%,占全国同类属数的20·99%,其中裸子植物4属4种,被子植物4属65种。在被子植物中,双子叶植物占41属58种;单子叶植物占6属7种。在51个特有属中,单种属有39属,占总数的76·47%。唇形科、苦苣苔科、伞形科、兰科含特有属较多约占本区同类属的31·37%。特有属的生活型以多年生草本和落叶木本为主,两者共4属,占特有属总数的80·39%。特有属的分布区类型以东部和中部特有分布为主,并具有少量的南部特有分布成分,51个特有属的分布区类型表明了该区系由热带性质向温带性质的过渡性特征。本区的特有属植物多分布于低山和中山。金佛山与大巴山、武陵山、神农架关系较为密切,它们同属于川东-鄂西特有现象中心(或三峡中心)。在51个中国种子植物特有属中古特有属和珍稀濒危物种占有较大的比例,本区无疑是古植物区系的重要避难所。

Endemic genera of Chinese seed plants in Jinfo Mountains Nature Reserve

Based on field investigation and quantitative analysis, it was found that there were 51 endemic genera of Chinese seed plants in Jinfo Mountains Nature Reserve, occupying 4.59% of the seed plant genera in this area and 20.99% of the genera in China. Among them, 4 genera belonged to Gymnospermae, and 47 genera belonged to Angiospermae. 39 mono-species genera occupied 76.47% of the total endemic genera of Chinese seed plants in the Reserve. The endemic genera from Lemiaceae, Gesneriaceae, Apiaceae and Orchidaceae occupied 31.37% of the total 51 genera. The genera of perennial herbages, deciduous trees, and deciduous shrubs were the main life forms, which summed to 41 genera, occupying 80.39% of the total endemic genera in this area. The 51 genera could be divided into two subtypes according to their distribution ranges, among which, 45 genera were restricted in eastern and central China, and 6 genera were mainly in southern China. Areal type analysis of the 51 endemic genera suggested that this flora had obviously transitional characters from tropical to temperate. These endemic genera mainly distributed over lower and medium height mountains. The flora was more closely allied to Dabashan, Wulingshan and Shennongjia in East Sichuan and West Hubei Center (or Sanxia Center). The ancient endemic genera and rare and endangered species took a substantial proportion in the 51 endemic genera of Chinese seed plants, suggesting that this area is an important refuge of paleoflora.