越南植物区系的组成与特征

通过对越南植物区系的科和属的组成分析，探讨了越南植物区系的性质与特征。越南植物区系主要由主产热带，分布区扩展到亚热带甚至温带的一些热带性大科组成，在科的分布区类型构成上亦以热带分布科占优势，反映了越南植物区系基本上是热带性质的植物区系，属于热带亚洲植物区系的一部分，但也带有较明显的大陆东南亚热带北缘性质和特点，与热带亚洲核心区植物区系有一定差异。在反映该植物区系的发生特征的代表科的组成上，越南植物区系具有较多的东亚南部植物区系的代表科，在一定程度上反映了其东亚起源背景。在属的地理成分的构成上，越南植物区系典型热带成分占78．9％，若加上越南特有成分，热带成分可占到80％以上，也反映它是热带性质的植物区系。在植物区系分区上属于热带亚洲区系或印度-马来西亚区系，是热带亚洲植物区系的热带北缘类型。

Floristic Composition and Characteristics of Vietnamese Flora

Based on the study of the floristic composition, the characteristics of the flora of Vietnam were discussed. The flora of Vietnam is composed mainly by tropical families and is therefore tropical in nature. At generic level, the tropical elements contributes c. 80% of Vietnamese flora, of which the tropical Asian element contributes 30.7% of its total flora. The Vietnamese flora is considered to be part of tropical Asian flora. Although the flora of Vietnam is dominated by tropical elements, it is also strongly penetrated by temperate Asian elements because of its geographical location in mainland SE Asia and the geological origin of Laurasia. The Vietnamese flora, as the same as the tropical flora of southern China, is still a marginal type of the tropical Asian flora from the mainland SE Asia.