广西那坡县种子植物区系种的地理成分分析及区系特点

An Areal Type Analysis of Species of Spermatophytic Flora in Napo County and Its Floristic Characteristics

在野外调查和分类处理的基础上,对那坡县的2201种种子植物进行了种的分布区类型的统计分析,结合科、属的地理成分分析,总结了区系特点。种的分布类型分析显示,中国特有分布最多(43.6％),其次是热带亚洲分布(33.0)和东亚分布(12.8％)。以区系分区区划作为分析地理分布特征的单位,将那坡的中国特有分布型划分为 3个分布亚型和11个变型,那坡与我国其它地区尤其是与西南、长江以南共有的种占很大比重(73.6％),反映上述区系的密切联系并有如下特点:①热带北缘性质;②特有现象显著;③岩溶特性;④起源古老;⑤与越南北部区系和滇东南植物区系联系紧密,体现了北部湾区系区的整体性质。

There are 2201 species of 889 genera and 174 families of seed plants in Napo county. Based on the investigation and statistics, the areal types of species are analyzed. The type of endemic to China contributes 43.6%, the type of tropical Asia 33.0% , and the type of East Asia 12.8% . According to the regionlization of Chinese flora, the authors propose that endemics can be divided into 3 subtypes and 11 varieties, of which the subtype of southern China distribution contributes the highest proportion. Based on the analysis to the families, genera and species of Napo flora, the characteristics of the flora were concluded as following:(1) the flora is of northern tropical edge in nature; (2)the flora is species richness and has rich endemics; (3) the flora is also characterized by rich karst species; (4) the flora is ancient in origin; (5) it has close floristic relationships with N. Vietnam and S. E. Yunnan which indicates the unity of Tonkin-Gulf floristic region.