广西岩溶植被植物区系

通过对数十年来广西植物研究所对广西岩溶植被全面调查积累的资料进行分析研究 ,结果表明 :( 1 )广西岩溶植被的植物区系成分有 1 75科 662属 1 5 0 0种 ,其中 6科 1 71属 83 4种为岩溶植被专有 ;( 2 )广西岩溶植被的区系成分以番荔枝科、椴树科、大戟科、苏木科、榆科、鼠李科、楝科、无患子科、漆树科等为主 ,与岩溶植被区系关系密切的科或乔木层优势科一般是落叶种类多或藤本种类多的科 ,如果优势科多数种类或优势种类是常绿的 ,这些种类不是热带植物区系成分 ,就是一类硬叶阔叶或针叶的亚热带种类 ;( 3 )岩溶植被植物区系组成为地域性但带有明显的地带性烙印 ;( 4 )广西岩溶植被区系成分以热带成分为主 ,温带成分为辅 ,62 2属种子植物 ,热带分布占 76.2 1 % ,温带分布占 2 1 .1 3 % ,中国特有占 2 .66% ;( 5 )组成山顶矮林的区系成分比较固定 ,乔木种类主要有 :乌冈栎、铁屎米、山胶木 (假水石梓 )、圆叶乌桕、铜钱树、化香树、广东松、翠柏等 ;( 6)与广西酸性土植被比较 ,岩溶植被植物区系中蕨类植物、裸子植物、双子叶植物以及单子叶植物 ,无论是科属组成 ,还是种的组成 ,均没有酸性土植被植物区系占的比例高 ,另外 ,与组成酸性土植被乔木层优势科的关系也很疏远

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.