巴山蕨类植物区系与分布的研究(英文)

Notes on flora and distribution of the pteridophytes of Ba Mountains

关键词:  巴山地区  蕨类植物  区系分析  垂直分布

Key words:  Ba Mountains  pteridophytes  floristic analysis  vertical distribution

摘要:

在野外调查和已有资料的基础上,对巴山地区蕨类植物的区系和分布进行了系统的分析。结果表明,该区具有蕨类植物34科,79属,289种(包括变种和变型)。区系地理成分复杂,在属的水平上以热带、亚热带成分为主,约占总属数的60.87%,温带成分占39.13%,而在种的水平上,热带、亚热带成分仅占总数的8.77%,温带成分处于优势地位,为91.23%,在温带成分中,东亚成分突出,加上中国特有成分共占总数的86.67%,显然应是东亚区系的一部分,因此巴山蕨类植物区系应属于中国—日本蕨类植物亚区。垂直分布可以划分3个带,蕨类植物主要分布在海拔1 000～1 800 m。

Abstract:

Based on the field survey and the known data,the flora and distribution of the pteridophytes in Ba Mountains were analyzed. The result were showed that there were about 289 species(including varieties and forms),79 genera and 34 families of pteridophytes in this region. Floristic and geographic elements are complicated. At genus level,tropical-subtropical distribution types were dominant,accounting for 60.87% of the total genera,and temperate distribution types covered 39.13% of the total. While at the species level,temperate elements were dominant,accounting for 91.23% of the total species,and tropical-subtropical elements covered 8.77% of the total. Of the temperate elements,East Asian element took the largest proportion,including endemic to China,accounting for 86.67% of the total species in the mountains,which indicated that Ba Mountains belonged to China-Japan Sub-zone of pteridophytes. The pteridophytes of Ba Mountains can be divided into 3 altitudinal zones,and their vertical distribution center occured between 1 000-1 800 m above sea level.