贵州红水河沟谷残存季雨林蕨类植物区系初步研究

Pteridophyte flora in remnant monsoon forest from valley of the Hongshui River,Guizhou Province

初步研究表明,贵州红水河沟谷残存季雨林共有蕨类植物178种(含变种和变型),隶属于30科67属。该区蕨类植物中优势科、属明显,优势科有水龙骨科Polypodiaceae,金星蕨科Thelypteridaceae,卷柏科Selaginellaceae,凤尾蕨科Pteridaceae,蹄盖蕨科Athyriaceae,铁角蕨科Aspleniaceae,三叉蕨科Aspidiaceae,鳞毛蕨科Dryopteridaceae,铁线蕨科Adiantaceae;优势属有卷柏属Selaginella,凤尾蕨属Pteris,毛蕨属Cyclosorus,铁线蕨属Adiantun,短肠蕨属Allantadia,铁角蕨属Asplenium,线蕨属Colysis。区系分析结果表明,该区蕨类植物属的地理成分包含世界广布成分、热带成分、热带亚热带成分、亚热带成分、温带成分和东亚成分等6个成分类型,以热带亚热带成分(含26属)为主,频率达44.83%;种的区系成分包含世界广布成分、热带成分、热带亚热带成分、温带成分、东亚成分和中国特有成分等6个成分类型,以热带亚热带成分为主(含103种),频率达59.54%。聚类分析结果显示,该蕨类区系与深圳南山区蕨类植物区系地理成分的组成最为相似。

By line transect method, we investigated fern resources in a remnant monsoon forest from a valley of the Hongshui River in Guizhou Province, and did cluster analysis to compare this flora with other 12 areas. There were 178 species （including varieties and forms ） of fern, which belong to 67 genera in 30 families. The dominant families were Polypodiaceae, Thelypteridaceae, Selaginellaceae, Pteridaceae, Athyriaceae, Aspleniaceae, Aspidiaceae, Dryopteridaceae, and Adiantaceae and genera were Selaginella, Pteris, Cyclosorus, Adiantum, Allantodia, Asplenium, and Colysis. In this area, flora of the fern genera consisted of plants found throughout the world as well as those from the tropical, tropical to subtropical, subtropical, temperate, and East-Asian zones. For those genera that were not spread throughout the world, the 26 dominant genera from the tropical to subtropical zone accounted for 44.83% of the total. The flora of the fern species included those found throughout the world, in addition to those from tropical, tropical to subtropical, temperate, and East-Asian zones along with those endemic to China. Excluding genera that were spread throughout the world, the dominant species were from the tropical to subtropical zone （ 103 species ） and accounted for 59.54% of the total. Additionally, for pteridophyte flora composition, cluster analysis results indicated that this area most closely resembled Nanshan District in Shenzhen, Guangdong Province. [ Ch, 1 fig. 3 tab. 26 ref.]