云南南滚河自然保护区种子植物分布区类型多样性的垂直分布格局

通过物种分布数据库的建立以及对植物分布区类型的统计分析,探讨了云南南滚河自然保护区植物分布区类型多样性的垂直分布格局.结果表明,中国特有成分和温带区系成分所占比重随着海拔的升高均呈单调递增格局;而热带、亚热带区系成分所占比重呈单调递减格局.在整个海拔梯度上,地中海、西亚至中亚分布,中亚分布成分所占比重均很小,甚至未发现,这可能与研究区域内湿润的气候或生境有关.海拔梯度上泛热带分布与热带亚洲区系成分所占比重均明显高于其他区系成分,表明该区域的植物区系与热带亚洲和泛热带植物区系之间的紧密联系.海拔梯度上不存在区系平衡点,这可能与研究区域所处的低纬度以及较小的海拔高差有关.

Altitudinal Patterns of Diversity of Floristic Distribution Types in Nangunhe Nature Reserve,Yunnan,China

Getting the information of the basic characteristics and distribution of regional flora is of great significance to understanding its origin and species diversity patterns. Based on documented information on the Nangun River Nature Reserve in Yunnan, China, patterns of diversity of floristic distribution types on the altitudinal gradients were examined. The results indicated that the proportions of elements endemic to China and the temperate elements increased with the increase in elevation and the shares of elements of tropical and subtropical showed a monotone decreasing pattern. Throughout the elevation gradients, Mediterranean, W. Asia to C. Asia, and C. Asia had very small, if any, proportions, which was probably the result of the humid climate in the research area. Elements of pantropic and Trop. Asia shared much more proportion, which indicated a strong relationship with flora in pantropic and tropical Asia. No floristic equilibrium point was found throughout the elevation gradients, which maybe was the result of low latitude and small elevation differnce gap.