锦鸡儿属植物分布研究

依据每个种的地理分布范围,确定了出六种分布类型,并编制了属的分布密度图。结合各类发布特点及其形态特征,认为东亚西南部为其起源中心,而中亚来其变异分化中心。起源第三纪中期的原始类群Ser.Caragana,在寒旱主要压力下分化适应,形成现代化布格局。

STUDY ON DISTRIBUTION OF THE GENUS CARAGANA FABR.

The distribution of the genus Caragana is typical Asia Temperature type(Fig. 1), but one species migrated to the subtropical zone of Asia, four to the European and one differentiated in cool Atarctic zone. According the simility of species distribution of caragana, six distribution types were divided, East-Asia type, Middle- Asia type, Mongolia-plateau type, Tibet- plateau type, Black- sea type and Discontined type. Each distribution type have a catalogue (section) dominated. The formation of each type and the relation among the types were discussed. Density map (Fig. 2) show that there are two density centres in the genus Caragana, East- Asia centre and Middle- Asia centre. The former is original centre which has total sections of the genus with 16 species, the latter is variety centre which only have 3 evoluted sections with 15 species. At last, the paper discussed the origin and differentiation of the genus Caragana from Tertiory.