山西庞泉沟国家自然保护区种子植物区系研究

庞泉沟自然保护区共有种子植物89科359属809种,其中裸子植物2科6属7种,被子植物87科353属802种。含5属以上的科15科,单、寡种属共330属,这些科、属在植物区系组成中具有重要作用。种子植物科、属、种的区系地理成分复杂多样。科的分布区类型中,世界分布型40科,北温带分布型24科,分别占总科数的44.94%和26.97%。属的分布区类型中,温带成分256属,占总属数的82.05%,反映出该区植物区系的温带性质。种的分布区类型中,中国特有分布种居首位,尤以华北成分占优势,其中华北落叶松、黄刺玫、油松等为该区植被建群种或优势种。科、属、种的特有现象不平衡,没有中国特有科,中国特有属、特有种分别为7属、325种。

Studies on the Flora of Seed Plants in Pangquangou Nature Reserve, Shanxi Province

In Pangquangou Nature Reserve,it was known that there were 809 species of seed plants in the region,which belonged to 359 genera and 89 families.Among them there were about 2 families 6 genera 7 species in Gymnospermae,and 87 families 353 genera 802 species in Angiospermae.15 families were more than 5 genera and 330 genera were not more than 5 species.These families and genera played(important) roles in seed plants flora.Analysis based on families,genera and species shown that the floristic elements in the region were diversity.Families: Cosmopolitan type was dominant in the families.It had 40 families.North Temperate type(24 families) was on the second place.Genera: Temperate floristic(elements) were significant in genera flora.256 genera belonged to temperate type,which accounted for(82.05%) in total genera.Moreover,Species endemic to China were the largest type of species elements.North of China elements were especially predominant.Some species such as Larix principis-rupprecht,(Rosa) xanthina and Pinus tabulaeformis were constructive or dominant species of the region vegetation.It was different in endemic of families,genera and species.There was no family,but 7 genera and 325 species were endemic to China.