神农架世界自然遗产地种子植物科属的古老性

Archaic nature of seed plants from the Shennongjia World Natural Heritage Site,China

为了研究神农架世界自然遗产地的种子植物区系特征,基于Phylomatic建立时间树并综合多学科证据,探讨了该区系种子植物科属起源的时间特征。结果发现,神农架世界自然遗产地裸子植物占中国华中山地分布中心属和种的67%和74%,是中国裸子植物分布中心之一;被子植物科的基部类群科占中国的85%;种子植物单型科(仅含1属1种)占中国的42%;拥有中国特有属56属,占中国特有属总数的23%,很多为古老特有属;神农架世界自然遗产地还分布有中国超过50%的东亚-北美间断分布属。这些事实表明神农架世界自然遗产地种子植物区系起源古老,且有连续的传代线,是神农架世界自然遗产地突出普遍价值的重要体现。

To study the floristic and origin characteristics of seed plants from the Shennongjia World Natural Heritage Site（ SNJWNH）,a time tree was established based on Phylomatic.Furthermore,the temporal characteristics of the origin of the genera in this area were discussed based on multidisciplinary evidence. Results showed rich gymnosperm diversity in SNJWNH,accounting for 67% and 74% of the total genera and species from the diverse mountainous regions in Central China. The proportion of basal families of angiosperms in SNJWNH was also high,reaching 85% of the total basal families in China. Monotypic families（ containing only one genus and one species） in SNJWNH accounted for 42% of the total monotypic families in China. Furthermore,SNJWNH also possessed 56 genera endemic to China,accounting for 23% of the total endemic genera in China. The genera belonging to the East Asian and North American disjunctive distribution pattern in SNJWNH accounted for more than 50% of the total number of that floristic type in China. These results show that the seed plants of SNJWNH exhibit characteristics of ancient origin,and have continuous lineages lasting for a long evolutionary history. In conclusion,the seed plants of SNJWNH are critical toits value,and are of considerable importance to plant systematic and phylogenetic studies.