东灵山地区的蕨类植物区系及其生态特点

东灵山地区的蕨类植物共有22种,它们隶属于11科、14属,发现北京地区一新记录种,即西北铁角蕨(Asplenium nesii)。在东灵山蕨类植物属中,全球广布属最多,其次为寒温带分布属,热带分布属最少。种的区系成分,东亚分布类型为最多,其次为温寒带分布和中国特有成分,没有热带类型分布,分布的海拔主要在500m至1600m,生态类型主要为石生与土生两类。

FLORA AND ECOLOGICAL CHARACTERISTICS OF FERNS IN DONGLING MOUNTAIN AREA

In Dongling Mountain area, there are 22 species of fern which belong to 11 families and 14 genus. A species is first recorded in Beijing area. The 14 genera can be grouped into 3 distributional types. Of the 3 types, the cosmopolitan type with 7 genera is at the first position. North temperate type with 5 generals at the second position. The 20 species can be also grouped into 3 types. The east Asian distributional type is at the first position. North temperate type at the second position. Their distributional altitude is from 500m to 1600m. Author's address Institute of Botany, Chinese Academy of Sciences Beijing 100093.