Studies on Flora Pteridophyta in Yangshan Mountains National Forest Park of Bijie

Through fieldwork,specimen collection,sorting,identification,access to literature obtained the fern list at Yangshan forest park in Bijie,which is helpful to future analysis of composition of ferns and flora characteristics.The results show that there are 27 families,50 genera and 107 species at Yangshan forest park in Bijie.The dominant families are Dryopteridaceae,Athyriaceae,Polypodiaceae,Thelypteridaceae and the prominent genera are Dryopteris,Athyrium,Pteris and Asplenium.We can know that tropical elements have advantages in this region from the proportion of the distribution of types of ferns in the area families and genera.There are 14 families tropical sub-buko,which is accounted for 87.50percent of the number of total subjects.(Except for world distribution,the same below).Tropical distribution is 30 genera,which is accounted for 81.80percent.From the proportion of the species distribution type,temperate elements have advantages in this region.Temperate distribution is 85percent,which accounted for 85 percent of the total species.Especially unique to China,the East Asia and China-Japan distribution type more,subtropical to warm temperate obviously.