甘肃省荒漠种子植物属的区系分析

对甘肃省荒漠区种子植物属的组成及其区系特征进行了研究.结果表明:甘肃省荒漠区分布有种子植物228属,其区系特征为单种属和寡种属多,优势现象明显,植物区系具有温带荒漠性和古老性;区系地理成分复杂多样,包含9个分布区类型和13个变型,温带成分(包括北温带分布及其变型、旧大陆温带分布及其变型和温带亚洲分布)占有绝对优势,占总属的33.76%;地中海区-西亚-中亚分布也是主要的组成部分,占总属的28.98%,特有成分比较低,中国特有成分仅4属,只占总属数的1.57%,起源古老,多为本土发生.

Floristic Analysis of Spermatophyte Genera in the Desertification Area in Gansu Province

In order to analyze the composition and feature of spermatophyte genera in the desertification area in Gansu Province and explore their origin,authors of this article conducted a long-term survey.The results and ample,relevant data show that the seed plants distributed in the desertification area are of 228 genera, whose flora feature is dominated by one-seeded and depauperated genera,with marked phenomenon of superiority;that the flora owns tropical desertification and antiquity and the floristic geographical composition is complex and diversified,covering 9 distribution zones and 13 variable types;that among them,tropical components play a dominant role,occupying 33.76% of the total;that the distributions of the Mediterranean-West-Asia-Central-Asia is also one of the main component flora in this area,taking up 28.95%;and that particular components occupy a lower percentage,with Chinese endemic genera being only 4,taking up only 1.57 % of the total and mostly taking place indigenously with ancient origin.