成都市园林种子植物科的分布区类型初探

成都市园林种子植物成分十分丰富,有164科767属2479种,其中珍稀濒危植物种类繁多,植物生活型多种多样,具有较大的开发潜力。以《成都市园林植物》及实地调查为依据,根据吴征镒(2003)划分分布区类型系统,分析成都市园林植物科的区系特征。结果表明:成都市园林种子植物科的分布区类型复杂多样,包含15个类型和12个变型。有41科为世界广布,它们构成了成都市园林植物的主体;热带亚热带成分与温带成分相互渗透,形成明显的过渡性;区系成分中以国产科为主,引进科占有一定比例。建议在成都市未来园林建设中,积极选择乡土植物,构建多层次复合绿化体系,积极栽培特有植物及濒危植物,慎重引进外来物种及新品种,加强对引进种与新品种的栽培管理及安全性评估。

Preliminary study of the areal types of families on garden seed plants in Chengdu

There are 2 479 species of garden seed plants in Chengdu,belonging to 164 families and 767 genera. Some are endangered,rare,precious and peculiar species with various plant life forms and have great developing potential for garden construction. Based on the data in Garden Plants of Chengdu and investigation on the spot, the characteristics of the areal types of families in garden seed plants in Chengdu were analyzed. The results showed that all these families in garden seed plants could be classified into 15 areal types and 12 subtypes. Among them,41 families were widespread and constituted principal part of garden plants in Chengdu. Transitional characters of geography were obvious because the temperate elements and the tropic elements infiltrate each other. Native families constituted main part of Chengdu garden seed plants and introduced families only occupied some proportion. It is suggested that multilevel complex greening system should be built on the basis of native plants,and endangered,rare species and peculiar species should actively be cultivated in the garden construction of Chengdu. It is suggested that introduced species and new breeds be carefully introduced,and strengthen the cultivation management and the evaluation of the security of introduced species and new breeds.