甘肃被子植物中国特有属研究

Study on the genera endemic to China in the angiosperm flora of Gansu

甘肃位于秦岭山地、黄土高原、青藏高原和蒙新高原的交接地带,气候类型多样、区系成分复杂。在甘肃被子植物区系中分布有中国特有属57个,含72种1亚种6变种,隶属于38科,其数量为黄河流域以北各省区之首。研究对廉永善等1997年所提出的甘肃中国特有类群分布区亚型划分进行了修订,对甘肃被子植物中国特有属在各分布亚型中属的数量、属型结构及所含种的数量进行了研究,并对特有类群的地理分布进行了探索。结果表明:亚热带区系成分在甘肃被子植物中国特有属中占有很重要的位置,计24属,占特有属数的42.1%。在各分布区亚型所含属种数量的统计中,华中成分和横断山成分分别位居第一和第二,是甘肃中国特有属组成的主要成员,分别为15属和13属,占26.3%和22.8%。单种属(包括单型属和甘肃仅分布1种的少型属至多型属)是甘肃中国特有属的主体,占甘肃中国特有属的82.5%。文县无疑是甘肃被子植物中国特有属及所含种的分布多度中心。

Gansu Province is located in the transitional zone among Loess Plateau, Qinghai-Tibet Plateau, Innermogolia-Xinjiang Plateau and Qinling Mountains. This region has significant diversity in climate types and complexity in floristic elements. Genera endemic to China in the angiosperm flora of Gansu Province accounted to 57 genera, consisting of 72 species, 1 subspecies, 6 varieties and belonging to 38 families. The quantity is superior to ones of other provinces or autonomous regions of the yellow river. In this paper, the divisional scheme used by Lian Yong-shan et al. （1997） on areal-subtype infra areal-types endemic to China was revised. The numbers of genera and the composition of genera type in every areal-subtype on the genera endemic to China in the angiosperm flora of Gansu Province were studied. The results showed that the subtropical species were the donlinant, including 24 genera, 42.1 % of total genera; Central China species and Hengduanshan Mountains species situated in the first and second for the quantity of genera separately, 15 genera and 13 genera, 26.3% and 22.8% of total genera; the geriera with one species, including monotypic genera and oligo-typic to more-typic genera only one species distributed in Gansu, were the most important genera type, 47 genera, 82.5% of total genera. Wen County is undoubtedly the abundance centre of endemism in the Angiosperm Flora of Gansu.