An investigation of Pteridoflora in Duliu River Wetland Nature Reserve of Dushang,Guizhou Province

The floristic composition and geographic feature of pteridophyte in Duliu River Wetland Nature Reserve were investigated based on field survey and data collection.The results demonstrated that the pteridophyte of Duliu River Wetland Nature Reserve consisted of 34 families,65 genera and 146 species(containing the taxa below the species),most of which were Dryopteridaceae,Polypodiaceae or Aspleniaceae.The floristic composition of pteridoflora was complicated.In this area,the pteridophyte,showed significantly temperate property,and the temperate species accounted for 71.0% of total species.Among them,103 species were the East-Asia species,accounting for 70.3%,suggesting that the pteridophyte here belonged to the East-Asia distribution.In addition,the tropical distribution species were 16.4%,indicating that pteridophyte in this area somewhat characterized in tropical distribution.As the most areas in Guizhou Province,Duliu River Wetland Nature Reserve located in transition section,a large part(46.1%) of genera contained only one species,suggesting that the pteridophyte in this area had transitivity.Compared with other regions in China,the pteridophyte here more diversified in families and genera,rather than in species.