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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.
Based on the collection of the existing literature and the investigation of the complement point, the species diversity and the phylogeographical analysis of natural distributed seed plants in the middle and upper reaches of Bailongjiang River were studied. The results showed that the total number of seed plants with natural distribution in this area was 1 528 species, 1 subspecies, 80 varieties and 6 varieties belong to 115 families and 519 genera, of which 565 are woody plants. The flora of this area is composed of many geographical elements, with temperate elements occupying the absolute predominance, temperate distribution Accounting for 75.1% of the total, accounting for 72.9% of the total in the temperate zone, indicating a clear transitional zone. The area should be assigned to the Himalayan forest sub-region and the Hengduan Mountains in China.