白龙江中上游林区种子植物物种多样性与区系特征

在收集已有文献资料和补点调查的基础上,对白龙江中上游林区天然分布的种子植物进行了物种多样性和区系统计分析.结果表明:本区天然分布的种子植物共计有1 528种,1亚种,80变种,6变型,归属于115科,519属,其中木本植物565种;该区种子植物区系由多种地理成分组成,以温带成分占据绝对优势,温带分布属占75.1%,温带分布种占72.9%,表现出明显的区系过渡性;本区应划归中国-喜马拉雅森林植物亚区、横断山脉地区.

Species diversity and floristic characteristics of seed plants in the middle-upper reaches of the Bailong River

On the basis of the collection of literature data and the additional survey,the author identified and arranged the plant samples naturally distributing in the Middle-Upper Reaches of Bailong River,and has worked out"A list of the seed plants in the middle-upper reaches of the Bailong River" as the basis of this floristic analysis.The results show as follows:1.There are 115 families,519 genera,1528 species,1 subspecies,80 varieties and 6 forms of naturally distributed seed plant in this area,including 565 species of woody plants;2.The seed plants are composed of various floral elements,characterized by transitional flora and dominated by temperate elements,of which temperate genera occupy 75.1 % of the whole genera in this area and contain 72.1 % of the total species number;3.This area should be regarded as a part of the Hengduan Mountains Region of the Sino-Himalayan Forest Subarea.