【摘要】 在调查湖南省云山自然保护区植物的基础上 ,对该区的蕨类植物进行了初步的分析 .云山共有蕨类植物 3 4科 ,67属 ,13 7种 .其区系结构表现出如下几个方面的特征 :1地理成分多样 ,属和种分别分为 13和 12个分布区类型 ;2在科和属的水平上 ,热带成分占优势 ,但在种的水平上 ,亚热带成分占绝对优势 ,这些种类大都是以我国长江流域为其分布区中心 ,是以亚热带为其分布中心的温带成分 ,云山蕨类植物区系属于温带性质 ,是泛北极植物区的组成部分 ,与热带蕨类植物区系也有一定的亲缘关系 ;3有 3 0种为中国特有分布 ,并有 1个中国特有属 ;4东亚成分有 70种 ,其中全东亚分布 13种 ,中国—喜玛拉雅分布 12种 ,中国—日本分布 45种 ,云山处于中国—喜玛拉雅和中国—日本成分的交汇地区 ;5属内种系贫乏 ,单种属有 3 8个 ,2～ 4种的少种属有 2 3个 ,而含 5种或5种以上的属仅有 6个更多还原

【Abstract】 Yunshan Nature Reserve is situated in Southwest Hunan and extends from 110°22′～111°03′E, 26°25′～27°00′N with an area of 83 km 2. After a floristic analysis of the pteridophytes of Yunshan, some five general conclusions are obtained, which are shown in the following. (1) According to the investigation and collected data, up to now, 34 families, 67 genera and 137 species are recorded in Yunshan, of which the largest families and genera are Selaginellaceae, Polypodiaceae, Thelypteridaceae, Athyriaceae, Dryopteridaceae, Pteridaceae and Selaginella, Pteris, Athyrium, Dryopteris, respectively. (2) Genera are rare in the families, 1 genus in 25 families; 2～4 genera in 5 families; and 5 or more genera in 4 families. Species are also rare in the genera, 1 species in 38 genera; 2 species in 13 genera; 3 species in 5 genera; 4 species in 5 genera; and 5 or more species in 6 genera. (3) The types of pteridophytic area pattern are rich in number; the types of genera and species area pattern are divided into 13 types and 12 types respectively. This pteridophytic flora has the temperate character of East Asia. In the floristic composition of this area the families of tropics and mainly tropics distribution make up 67.65% of the total families; the genera of tropics distribution make up 59.71% of the total, but the species of temperate distribution make up 72.99% of the total. (4) In Yunshan, there is 1 Chinese endemic genus and 30 Chinese endemic species including 2 endemic species are found. (5) This pteridophytic flora is a transitional one from the tropical to the temperate. It belongs to the area of Central China, Holarctic Kingdom.更多还原