云南哀牢山国家级自然保护区蕨类植物区系地理研究

通过野外调查和资料整理分析,哀牢山国家级自然保护区共有蕨类植物48科,118属,446种(包括变种和变型)。优势科为鳞毛蕨科、水龙骨科和蹄盖蕨科,优势属为耳蕨属、蹄盖蕨属、鳞毛蕨属和卷柏属。区系分析结果表明:该蕨类区系是亚热带性质的区系;热带亚洲成分随着海拔的升高,比例逐渐降低,而中国-喜马拉雅成分随着海拔的升高逐渐增加;地理成分的东西坡差异不明显;该蕨类区系与喜马拉雅地区和热带亚洲的关系较密切,而与日本的关系较疏远;该蕨类区系具有较丰富的中国特有成分;哀牢山明显处于滇西北、滇东南这两大中国特有多样性中心之间,成为联系的纽带。

Pteridophytes Floristic Phytogeography in Mt. Ailaoshan Nature Reserve of Yunnan, China

Field investigations and data references indicates that there are totally 446 species(including varieties and forms),118 genera and 48 families of pteridophytes in Mt.Ailaoshan Nature Reserve.The dominant families are Dyopteridaceae,Polypodiaceae and Athyriaceae,and the dominant genera are Polystichum,Athyrium,Dryopteris and Selaginella.Floristic analysis reveals that in this reserve the pteridophyte florae fall into the category of subtropical florae and the tropical Asia elements show a gradually decreased percentage as its altitude increases and the Sino-Himalayan elements show an increased percentage with increased altitude;The geographical elements differ inconspicuously between its eastern and western slopes;The peteridophyte florae have a close relation to Himalayan and tropical Asia florae and less close to Japan florae;The peteridophyte florae contain abundant the elements endemic to China and Mt.Ailaoshan obviously stands between the two peteridophyte diversity centers of China,northwest Yunnan and southeast Yunnan,functioning as the linkage.