• 环境与生态 •

### 从秦岭蕨类植物区系地理成分论秦岭山地生态分界线的划分

1. 1. 北京师范大学生命科学学院,北京 100875;
2. 北京师范大学资源学院,北京 100875
• 收稿日期:2010-01-03 修回日期:2010-06-26 出版日期:2010-09-20 发布日期:2010-09-20
• 通讯作者: 康慕谊,教授,博士生导师。E-mail:kangmy@bnu.edu.cn
• 作者简介:王菁兰(1987-),陕西宝鸡人,女,研究生。主要从事植物分类学、植物地理学以及生态学相关研究。 E-mail:wangjinglan1987@gmail.com;
康慕谊,教授,博士生导师。E-mail:kangmy@bnu.edu.cn
• 基金资助:

国家自然科学基金项目(40671065)

### Division of the geo-ecological boundary in Qinling Mountain Range based on the composition and geographical elements of its Pteridophyta flora

WANG Jing-lan1, LIU Quan-ru1, MENG Shi-yong1, ZHAO Ming-fei1, KANG Mu-yi2

1. 1. College of Life Sciences, Beijing Normal University, Beijing 100875 China;
2. College of Resources Science &|Technology, Being Normal University, Beijing 100875, China
• Received:2010-01-03 Revised:2010-06-26 Online:2010-09-20 Published:2010-09-20

Abstract:

The Qinling Mountain Range is considered as an important geo-ecological boundary between the warm temperate and the subtropical zones in eastern China, however, the specific line of the boundary has been controversial among the academic circles. Several studies based on vegetation ecology and flora geography have been done on discussing the division of this boundary, but in all of which Pteridophyta is not included. Pteridophyta is a transitional link between different flora groups in plant evolution, and thus is more sensitive to the environment that fosters it than other plant groups. It is conducive to and necessary for a better understanding of the division of the geo-ecological boundary in Qinling Mountain Range to research into the Range's Pteridophyta flora. In this paper, the composition and geographical elements of the flora of Pteridophyta were studied, and the division of the vertical Pteridophyta spectrum and the further division of the geo-ecological boundary in Qinling Mountain Range were also discussed, by applying the principles of classical florology and using quantitative ecology method as TWINSPAN and DCA into the analyses, based on comparison between the field investigation data and the relevant literatures. The results of our research have shown and revealed: 1) There are 311 species of Pteridophyta, belonging to 85 genera and 36 families in the Qinling Mountain Range; in which the dominant families are Dryopteridaceae, Athyriaceae, and Polypodiaceae, and the dominant genera Dryopteris and Polystichum; meanwhile, the main areal-types of family and genera are tropical elements, while the areal-types of species is dominated by the temperate elements. 2) The altitude of 1000 m a.s.l. at the southern piedmont of the Range should be an important ecological boundary, since the floristic composition of the Pteridophyta below this elevation showed more similar features to the subtropics, while above it the features of the composition and the vertical vegetation spectrum of the Pteridophyta are much closer to the temperate zones. 3) DCA ordination of FER (floristic element ratio) among 15 regions in northern and southern China and the both sides of Qinling Mountain Range strongly supported the hypothesis mentioned above. Based on these results, we tend to deem that the geo-ecological boundary between the subtropical and warm temperate zones lies around the altitude of 1000 m a.s.l. at the southern piedmont of the Range.