摘要
昆明西山地处滇中高原,位于102°37`～102°38`30"E,24°57`～24°59`20"N,海拔1 890～2 358.3 m,面积16km2。其蕨类植物区系组成共31科64属133种。其中优势科是水龙骨科、鳞毛蕨科、中国蕨科、蹄盖蕨科、金星蕨科、铁角蕨科、凤尾蕨科、卷柏科,优势属为鳞毛蕨属、铁角蕨属、蹄盖蕨属、卷柏属、凤尾蕨属、粉背蕨属。根据区系分析的结果,该蕨类区系具有下列7个区系特征:(1)种系密度大,成分多样;(2)具有热带亲缘关系;(3)特有现象明显:有2属为中国特有属,30种为中国特有种;(4)与旧大陆其它地区的联系较广泛;(5)与喜马拉雅山地区的联系较密切;(6)属内种系贫乏(单种属占62.5％,2～3种的属占21.9％);(7)是滇中高原蕨类植物区系较典型的缩影。
Kunmung Xishan is located in the central part of Yunnan Plateau, between 102°37' ~ 102°38'30'E, and 24°57'~24°59'20'N. It covers an area of about 16 km2,altitude is from 1 890 m to 2 358.3 m. Up to now, 31 families, 64 genera and 133 species (including varieties and forms) of pteridophytes have been recorded from this area. Among them, the dominant families are Polypodiaceae, Dryopteridaceae, Sinopteridaceae, Athyri-aceae, Thelyteridaceae, Aspleniaceae, Pteridaceae and Selaginellaceae, the dominant genera are Dryopteris, Asplenium , Athyrium , Selaginella , Pteris and Aleuritopteris. According to the results of floristic analysis, this pteridoflora shows 7 floristic features as follows: (1) The species density of this pteridoflora is 8.312 5 species per square kilometer. The types of area pattern are diversity. (2) It has affinities with that of tropics although it situated in the area of holarctic region . (3) Endemic phenomena are rather obvious. There are 2 Chinese endemic genus and 30 Chinese endemic species. (4) It has wide relationships to those of Old World but very weak relationships to that of neotropical region. (5) It is much more closely allied to that of Himalayas then to that of E. Asia, especially of Japan. (6) Species are rare in general genera. There are few species in general genera except a few genera. 62.5% genera only include 1 species and 21.9% genera include 2-3 species. (7) It is a typical miniature of pteridoflora of the central part of Yunnan Plateau.
出处
《山地学报》
CSCD
2004年第2期193-198,共6页
Mountain Research
关键词
蕨类区系
区系地理
昆明西山
云南
Pteridoflora
Floristic phy togeography
Kunming Xishan, Yunnan
