黔北丹霞地貌蕨类植物初步研究

Preliminary investigation in Pteridophyte of Danxia Landform in North Guizhou,China

在野外调查和查阅资料的基础上,对黔北丹霞地貌地区蕨类植物进行区系分析。结果表明:①该区蕨类植物物种丰富,有41科,96属,303种(含种下分类单位),其中鹿角蹄盖蕨为贵州分布新记录种。②优势科、属明显,优势科有鳞毛蕨科、蹄盖蕨科、水龙骨科、金星蕨科、铁角蕨科等。③该区蕨类植物区系地理成分复杂,其中热带、亚热带属63个,占总属数的65.6%,表明该区蕨类植物有较高的热带亲缘关系。④东亚地理成分的种有139个,占总种数的45.9%,表明该区蕨类植物属于东亚区系。⑤该区蕨类植物与雷公山的亲缘程度高于与荔波的亲缘程度。

Based on the investigations by the authors and the records in literature,the floristic characteristics of pteridophytes of Danxia landform in the north area of Guizhou Province was studied in the present work.The results demonstrated that the area was abundant in species of pteridophytic flora,including 303 species（varieties）,96 genera,and 41 families.among which Athyrium araiostegioides was newly recorded in Guizhou.There were some dominant families and genera,e.g.families Dryopteridaceae,Athyriaceae,Polypodiaceae,Thelypteridaceae and Aspleniaceae.Complex geographic distributions of pteridophytes were observed,among which 63 genera are tropical-subtropical distribution types,accounting for 65.6% of the total,indicating that the fern flora at genus level were characterized by tropical and subtropical nature.At species level,East Asia element（139species） took the largest proportion,accounting for 45.9% of the total,which suggested that the fern flora is of the East Asia.The genetic relationship of fern flora in this area was more close to that of Leigong Mountain than that of Libo County.