云南临沧晚中新世槭属叶片和翅果研究  

Acer Leaves and Samaras from the Late Miocene of Lincang,Yunnan Province

作　　者：王云峰[1] 邵洋[1] 李斌科 刘珂男[1] 解三平[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000

出　　处：《高校地质学报》2015年第1期105-116,共12页Geological Journal of China Universities

基　　金：国家自然科学基金(41172021;40802008)

摘　　要：云南省是研究我国植物多样性,植物区系演化及被子植物迁徙路线的有利场所。文中鉴定并描述了采自云南临沧上中新统邦卖组的槭属(Acer)8块叶片和17块翅果化石,共鉴定为4个种,其中包括1个新种和1个相似种,分别为Acer lincangense sp.nov.和Acer cf.jingdongense。槭属化石在云南邦卖组的出现,证明了该植物群具有北温带和古热带的混生特征,反映了当时植物区系类型的多样化构成了云南现代植物多样性的基础。另外,通过对Acer全球大化石记录以及现生种的统计,总结得出槭属的地史演化具有3个发展高峰期:依次为始新世、中新世和全新世,从古至今呈现一种螺旋式递增趋势。Yunnan Province is a favorable place for investigation of plants diversity, floristic evolution and migration routes ofangiosperms. In this study, eight leaf impressions and seventeen winged fruits of Acer from the upper Miocene Bangmai Formation ofLincang, Yunnan Province were investigated. They are assigned into four species, including one new species-Acer lincangense sp. nov.and one conformis-Acer cf. jingdongense. The occurrence of the genus Acer in the Bangmai Formation provides the evidence that theLincang flora was mixed with elements of the north temperate and paleotropical zones. And this character of Neogene floristic diversityformed the basis of modern plant diversity in Yunnan Province. Furthermore, on the basis of statistical analysis of the number of fossilspecies at different geological periods and extant species at present, the evolutionary history of the diversity of Acer can be divided intothree optimum phases, i.e., the Eocene, the Miocene and the post-Holocene. The diversity of Acer at species level is spirally increasedthrough the three evolutionary cycles.

关 键 词：临沧 邦卖组 晚中新世 槭属 生物多样性 

分 类 号：Q914[天文地球—古生物学与地层学]