浑善达克沙地药用种子植物区系分析

本文应用植物区系地理学的基本原理,对浑善达克沙地药用种子植物的科、属组成和属的地理成分进行了统计分析,结果表明:(1)本区有药用种子植物78科,270属,504种。(2)优势科现象明显;单种属、寡种属数量最多,属级水平的多样性丰富。(3)该区系包含14个分布区类型,温带性质的成分占绝对优势,热带性质的成分不多,特有程度低。(4)资源区域间分布差异大;有一定的古老成分。

A Floristic Study on the Medicinal Seed Plants Flora in Hunshandake Sands

Using the principle of geobotany,the areal-types of families and genera and the geographic element of genera were analyzed based on primary survey of the medicinal seed plants in Hunshandake sand.The results showed as follows:(1) There are 504 species,270 genera,which belong to 78 families of medicinal seed plants in the study region.(2) Dominant families are notable.The genera with single species and few species of the medicinal seed plants are rich,and the diversity at genera level is very rich in this flora.(3)There are 14 areal types of the medicinal seed plants.Their floras show the temperate floristic elements are predominant in this area,the tropic taxa are rare,and the endemic elements are less.(4) The distribution of the plants represents a great deal of differences among areas.The plants flora has characteristics of archaic composition.