宽阔水自然保护区蕨类植物初步研究

宽阔水自然保护区共有蕨类植物28科67属194种(含种以下分类单位),优势科为鳞毛蕨科Dryopteri-daceae、蹄盖蕨科Athyriaceae、水龙骨科Polypodiaceae,优势属为耳蕨属Polystichum、鳞毛蕨属Dryopteris、铁角蕨属Asplenium,它们构成了宽阔水自然保护区蕨类植物的主体。对蕨类植物进行区系分析,结果表明：东亚分布种占绝大部分,共有98种,占到总种数的50．52%,属东亚植物区系；热带成分种35种,该地区植物与热带、亚热带有一定的联系；中国特有种55种,该地区具有地域特殊性；单种属多,具有地区过渡性。

A Preliminary Analysis of the Pteridophytes in Kuankuoshui Nature Reserve,Guizhou Province

Twenty-eight families of 67 genera and 194 species( including the subspecies) of pteridophytes were present in Kuankuoshui Nature Reserve, Guizhou Provice. The dominant families were Dryopteridaceae, Athyriaceae, and Polypodi-aceae and the dominant genera were Polystichum, Dryopteris and Asplenium. These families and genera constitute the main pteridophytes of Kuankuoshui Nature Reserve. The compositions of the fern flora were analyzed. The results indicated that the type of pteridoflora is complicated. In this area, ninety-eight species belong to the East-Asian region, accounting for 50.52% of the total species. This showed that more than half of the pteridophytes in Kuankuoshui Nature Reserve should belong to the East-Asian region. Besides, there were 35 species having tropical elements. The combined two elements in-dicate that predominate pteridophytes in this area have certain relationship with tropics and subtropics. Fifty-five species are of China unique flora, indicating that the region had a regional particularity. More than half of the genera( 34 genera) contain only one species, suggesting that Kuankuoshui may be a transitional area in relation for pteridophyte distribution.