Studies on floristic characters of pteridophyte in Kanglong Natural Reserve,Hunan

Floristic characters and distribution pattern of pteridophyte in Kanglong Natural Reserve,Hunan,China were analyzed.The results show that 202 species,77 genera and 36 families were recorded,accounting respectively for 28.13%,51.68% and 67.92% of ferns in Hunan province.The floristic elements were mainly tropical elements in the familiar(58.33%) and generic(55.84%) level,but tropical elements(42.08%) with a certain proportion of temperate-zone elements(40.10%) in the species level.The flora expressed a transitional characteristic from tropical to temperate.The origin of the flora is very ancient with 31 Chinese endemic species.Compared with other regions,the floristic composition of Kanglong is most closely related to that of Yingzuijie and Hengshan floras,more closely related to that of Shanqinshan,Liegongshan and Chishui floras,and hasn't so much relations with Lushan and Hupingshan floras.