Flora of Karst vegetation in Guangxi

Karst vegetation was investigated roundly for several decades by the personal in Guangxi institute of botany. Through analyzing and researching the information accumulated,the result shows that: (1)The flora of Karst vegetation in Guangxi consists of 175 families,662 genera,1 500 species,of which 6 families 171 genera 834 species only distribute in Karst vegetation; (2)The flora of Karst vegetation are mainly constituted by families of Annonaceae,Tiliaceae,Euphorbiaceae,Caesalpiniaceae,Ulmaceae,Rhamnaceae,Meliaceae,Sapindaceae and Anacardiaceae,and the arbor layer dominant families in Karst vegetation are usually the families that contain more deciduous species;if the species are evergreen,they are tropical,or they are sclerophyllous broadleaved or subtropical coniferous species; (3)Karst vegetation flora is regional,but has evident horizontal characteristics. (4)In 622 seed plants genera,76.21% genera belong to tropical,and temperate genera account for 21.13%,the others 2.66% genera are China endemic genera; (5)The flora of mountaintop bouquet is relatively fixed,some species such as Quercus phillyraeoides,Canthium dicoccum,Sinosederoxylon pedunculatum,Sapium rotundifolium,Paliurus hemsleyanus,Platcarya strobilacea,Pinus guangtungensis,Calocedrus macrolepis et cetera are primary arborous species; (6)The amount of family,genus and species belonging to Pteridophyte,Gymnosperm,Dicotyledon and Monocotyledon in Karst vegetation are all less than those of in acid vegetation,in addition,the flora of Karst vegetation has distant relations with the arborous dominant families in acid vegetation.