摘要
重庆分布中国种子植物特有属66属,包含100种,隶属于40科.其基本特征为:①种子植物主要科的特有成分分化程度不同;单种和寡种特有属所占比例较大,珍稀濒危植物丰富;重庆分布草本特有属所占比例低于全国草本特有属比例;以古老和孑遗性为主,存在一定年轻成分.②落叶木本22属,占木本植物的73.33%;主要垂直分布于海拔1000～3000m,表明特有属具有明显的温带性质.③地理水平分布以中国东部和中部特有分布变型为主,也有中国南部特有分布变型;重庆东南部和东北部是中国种子植物特有属在重庆的主要分布中心,中西部也有一定数量分布.
66 genera endemic to China were found in the spermatophyte flora of Chongqing, including 100 species of 40 families. The floristic characters are as follows： （1） The differentiation degree of endemic el- ements varies in different major families of the seed plants. It has a large number of monotypic and oligo- typic genera, and riches in rare and endangered plants. Proportion of herbaceous endemic genera in Chongqing is lower than that in the whole nation. Most of the 66 endemic genera are ancient and relic, but a certain number of young genera can also be found. （2） 22 endemic genera are deciduous woody plants, occupying 73.33% of the total endemic woody plants in Chongqing. A majority of the endemic genera dis- tribute in an area of 1 000-3 000 m alt. , showing an obvious temperate nature. （3） Areal-type analysis showed that the 66 endemic genera could be divided into two subtypes, most of which were restricted in eastern to central China, while others were mainly endemic to southern China. Southeast and northwest Chongqing are two main distribution centers of the Chinese endemic genera in Chong-qing, while the mid- west part also has a certain amount of endemic genera distributed.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期58-63,共6页
Journal of Southwest University(Natural Science Edition)
基金
科技部国家科技基础平台国家标本平台--教学标本子平台运行服务资助项目(2005DKA21403-JK)
关键词
种子植物区系
中国特有属
重庆
spermatophytic flora
endemic genera
Chongqing
