甘肃省裸子植物区系分析

The Analysis of Gymnospermous Flora in Gansu Province

在全面系统的查阅、鉴定、登记标本的基础上,依据吴征镒中国种子植物分布区类型划分方案和廉永善中国特有类群分布亚型的划分方案,对甘肃省裸子植物区系进行了数量统计和区系特征分析,绘制了甘肃省裸子植物种、属地理分布图,种、属数量随海拔变化的关系图和各分布区类型、亚型随海拔变化的关系图。结果表明,甘肃省裸子植物植物区系组成属温带性质,而且甘肃省裸子植物区系具有显著的交汇过渡性质和主体成分二元化结构的特点。并讨论了甘肃省裸子植物种、属分布多度中心变化的状况和青藏高原隆升对甘肃省裸子植物区系组成的影响。

Based on the systematically identifing specimens and recording its distribution area, according to the divisional scheme by Wu Zheng-yi（1991） on spermatophytel areal-types to China and the divisional scheme by Lian Yong-shan on areal-subtype infra areal-types endemic to China, the quantity of gymno- spermous flora in Gansu Province was statistical analyzed,and the characteristics of gymnospermous flora in Gansu Province were analyzed. The distribution map of species and genera was filled,and the related fig- ures between the quantity of species and genera and altitude grads were made. The related figures between areal-type,including areal-subtype, and altitude grads were made too. The results showed the temperate feature of Gansu gymnospermous floristic elements and obvious transition characteristic, and also discov- ered that there were differences in the abundance center between genera and species. Further, we found that there were obvious duplication composition phenomenon for the properties of climatic and the geological period of the origins between two important areal-subtypes （15 3 and 15-5） and taxonomic categories（gene- ra and species）. Lastly, the relation between the Gansu gymnospermous floristic element and Qinghai-Tibet Plateau＇s apophysis were also discussed.