江西裸子植物区系分析

江西裸子植物自然分布7科22属32种1变种(其中中国特有科1个为银杏科,特有属有银杏属、金钱松属、杉木属、水松属、白豆杉属等5个,特有种有银杏、华东黄杉、长苞铁杉、金钱松、水松等20种),分别占全国58.3%、53.66%、13.75%。江西有6个单型属,分别占世界和全国35.3%和50%。属分布区类型中以亚热带到温带成分和特有成分为主,分别占江西全部属的50%和22.72%。总结出江西裸子植物种级分布区亚型有17个,其中从西南或喜马拉雅到华东的分布就有9个分布式样18种,占总种数的54.5%。江西现代裸子植物通过南岭山脉、武夷山脉和罗霄山脉等与周边地区联系密切,相似性系数显示江西裸子植物区系与华南、华中、西南联系密切(相似系数皆大于50%),与华北比较疏远(相似系数为6.1%)。

The analysis of gymnospermous flora in Jiangxi Province

The gymnospermous flora of Jiangxi Province comprises 7 families,22 genera and 32 species(including 1 endemic family,5 endemic genera and 20 endemic species),accounting for 58.3%,53.66% and 13.75% of corresponding taxa in China.There are 6 monotype genera(up to 50% of corresponding taxa in China).Through geologic distribution analysis of genera types and species subtypes,there are an abundant of subtropical to temperate ones(up to 50%),and much of the endemic genera ones(up to 22.72%).17 species subtypes of Jiangxi gymnospermae flora were confirmed.There were more distribution patterns from southeasted China or Himalayas to easten China(up to 54.5% of all).The gymnosperms of Jiangxi Province interacted with areas being connected with Jiangxi Province through Nanling Mountains,Wuyi Mountains and Luoxiao Mountains,The similarity coefficient indicates that there is close relationship between gymnospermous flora of Jiangxi province and those of southern China or central China or southeasten China(similarity coefficient above 50%),while far relationship between Jiangxi and Shanxi province(northern China)(similarity coefficient 6.1%).