A Preliminary Analysis of the Pteridoflora in Dapingqing Wetland Natural Reserve Area of Guizhou Province

The floristic composition and geographic feature of pteridophyte in Dapingqing Wetland Nature Reserve were analyzed based on field investigation and data collection. Results were as follows: 24 families,43genera and 79 species( including the taxonomic units below species) of pteridophyte in Dapingqing Wetland Nature Reserve were involved,most of them were Dryopteridaceae,Polypodiaceae or Thelypteridaceae. Floristic elements of pteridoflora in this area was complex. The pteridophyte that accounted for 77. 2% in the total species had significant temperate features,which indicated that the temperate species occupied a dominant position. Among them,51 species were the East- Asia species,accounting for 64. 6% of total. These results reflected that the pteridophyte in Dapingqing Wetland Nature Reserve belonged to the East- Asia distribution. Besides,there were 14 species of tropical distribution and 4 species of cosmopolitans,indicating that pteridophyte in this area had close relationship with tropical distribution. As the same of the most areas in Guizhou province,Dapingqing Wetland Nature Reserve located in transition section. Most genera( 51. 2%)contained only one species,suggesting that the pteridophyte in this area had transitivity.