广西蕨类植物区系及植物资源的特点

对广西蕨类植物区系的研究分析表明，广西蕨类植物共有５４科，１２５属，５３２种．其蕨类区系表现出如下特点：（１）区系地理成分多样，但以热带亚热带成分占优势．热带分布及热带至亚热带分布分别占总科数的７４．６％，占总属数的８５．１％；（２）古老类群众多，既有各种原始的成分，也有不少在进化环节中占着重要地位的科属；（３）特有种众多，共含有４２个特有种，占总种数的７．９％，种的特有化程度较高，但却缺乏特有属；（４）与邻近地区的关系密切，从共有属的角度分析，其相似性相当高，这反映出广西蕨类植物区系是华夏植物区系的一个重要组成部分．就广西蕨类植物资源来说，可分为药用、观赏、食用３大类．各类资源已显示了较广阔的利用前景，但目前的利用水平还较低，这一方面为当地的经济发展提供了资源优势，同时也及早地为蕨类的物种多样性保护提供了极好的机遇．

THE CHARACTERISTICS OF PTERIDOPHYTIC FLORA AND PLANT RESOURCES IN GUANGXI

A study on the flora of Guangxi indicates that there are 54 families,125 genera and 532 species of pteridophytes showing the following characteristics:(1) diverse geographical elements,but the tropical and tropical to subtropical ones being dominant,together accounting for 74 6% of the total families and 85 1% of the total genera respectively;(2) many primitive elements as well as those that once played a key role in the phylogenetic line;(3) as many as 42 endemicspecies comprising 7 9% of the total,but no endemic genus;(4) judging from the generic similarity,the flora is closely related with those of the adjacent regions,indicating that it is an integral part of the Cathaysian Flora. Finally,as for the pteridophytic resources,these fall into three main categories,i.e.medicinal,ornamental and edible,showing great potential for future utilization,though the present utilization level is low. This provides favorable opportunties for the conservation of pteridophytic diversity as well as a resource advantage for local economic development.