中国特有种子植物属在云南的两大生物多样性中心及其特征

TWO BIG BIODIVERSITY CENTRES OF CHINESE ENDEMIC GENERA OF SEED PLANTS AND THEIR CHARACTERI-STICS IN YUNNAN PROVINCE

中国特有种子植物属在云南有两大生物多样性中心：一个位于滇西北，另一个位于滇东南。据初步统计，前者约有４７个属，分隶属于２７料，其中单型属１９个，少型属２２个，多型属６个，它们主要是温带性质；后者约有４８个属，分隶属于３６科，其中单型属３３个，少型属１３个，多型属２个，它们主要是热带亚热带性质。两个中心共有１１个属，只出现干前者有３６个属，而只出现后者有３７个属。两个中心的属在成因上差异很大：前者占主导地位的是生态成因而历史成因次之，后者占主导地位的是历史成因而生态成因次之。因此前者主要是新特有中心，而后者却主要是古特有中心。

There are two big biodiversity centres of Chinese endemic genera of seed plants in Yunnan province: NW Yunnan & SW Yunnan;According to preliminary statistics,the NW Yunnan centre has 47 Chincse endemic genera(belonging to 27 families,among them 19 genera are of monotypic ones,22 of oligotypic oncs and 6 of polytypic onesj which are mainly of temper-ate nature:the SW Yunnan centre has 48 Chinese endemic genera (belonging to 36 families,among them 33 genera are of monotypic ones,13 of oligotypec ones and 6 of polytypic ones)which are mainly of tropical and subtropical nature. There are 11 Chinese endemic genera which are common to both centres,but 36 genera are only occuring in the foimer centre and 37 genera are only occuring in the latter eentre. The origin cause of these genera in both centres is very dif-ferent.In the foriner eentre it is mainly of ecological reason rather than historical one, but in the latter centre it is mainly of historical reason rather than ecological one. Thus the former centre is mainly of neoendemism, but the latter centre is mainly of palaeoendemism.