江西九连山自然保护区蕨类植物资源调查和分析

Investigation and Analysis of Pteridophytes Resources in Jiulianshan Nature Reserve,Jiangxi,China

通过对九连山保护区蕨类植物的补充调查和统计分析,结果表明:(1)九连山自然保护区共有蕨类植物43科93属265种(含种下等级),物种组成较丰富,其丰富度指数在江西省的8个森林生态型自然保护区中排第2位;(2)该区蕨类植物中优势科、属明显,优势科为鳞毛蕨科、水龙骨科、蹄盖蕨科、金星蕨科;优势属为鳞毛蕨属、凤尾蕨属、卷柏属、铁角蕨属;(3)在科、属级别的分布区类型中,热带性质成分占绝对优势,分别占总科数和总属数的55.81%和69.89%,在种的地理成分上,以东亚成分占主导地位(占47.9%),热带性质次之(占34.9%);(4)该区的R/T值显示该区蕨类植物区系处于南亚热带与中亚热带的过渡区;聚类分析显示,与江西马头山自然保护区、江西齐云山自然保护区的关系最密切,在中国蕨类植物地理分区中属于华东区。

The supplementary investigation and statistical analysis of pteridophytes in Jiulianshan Nature Reserve were conducted.There were 265 species of pteridophytes(including subspecies grade)belonging to 93 Genera and 43 families.The species composition was rich,and the richness index was the 2 nd among the 8 forest ecotype nature reserves in Jiangxi Province.The dominant families and genera of pteridophytes were obvious.Dominant families consisted of Dryopteridaceae,Polypodiaceae,Athyriaceae,Thelypteridaceae.Dominant genera consisted of Dryopteris,Pteris,Selaginella,Asplenium.The flora of families and genera was dominated by the tropical elements,accounting for 55.81%and 69.89%of the total families and genera,respectively.The geographical composition of the species was dominated by the East Asian elements(47.9%),followed by the tropical elements(34.9%).The R/T value showed that the flora of pteridophytes to Jiulianshan was located in the transitional zone between the south subtropical zone and the middle subtropical zone.Cluster analysis showed that it was most closely related to Matoushan Nature Reserve and Qiyunshan Nature Reserve,and it belonged to east China in the pteridophytes geographical division.