侏罗纪木化石在云南的首次发现及其古生态学意义  

THE DISCOVERY OF JURASSIC WOOD FROM YUNNAN PROVINCE AND ITS PALAEOECOLOGICAL IMPLICATIONS

作　　者：李国取 吴亮[1] 张春波[1] 沈睿文[1] 俞赛赢[1] 王春玲 韦海波[3] 陈宇轩[3] 杨继媛 冯卓[3,4] 

机构地区：[1]中国人民武装警察部队黄金第十支队,昆明650111 [2]玉溪市博物馆,云南玉溪653100 [3]云南大学云南省古生物研究重点实验室,昆明650091 [4]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2015年第1期93-100,共8页Acta Palaeontologica Sinica

基　　金：云南乌蒙山西部1∶5万岔河、者海、会泽县、雨碌幅区域地质矿产调查项目;国家自然科学基金项目(41172006,41422201);现代古生物学与地层学国家重点实验室开放基金项目(133104);云南大学青年英才培育计划联合资助

摘　　要：木化石是一种特殊保存形式的植物茎干化石,通常保存了精美的内部解剖结构,对研究地质历史时期植物演化和古生态学具有重要意义。尽管已经报道了中国各个地质时期的木化石200余种,但侏罗纪木化石研究相对较少,而目前还没有云南侏罗纪木化石的正式描述。本文首次报道云南中生代木化石异木(Xenoxylonsp.)。标本采自会泽县邱家大坪子中侏罗统沙溪庙组下段上部,仅保存密木型次生木质部。管胞径向壁具缘纹孔扁圆形、紧挤、单列。交叉场具1个窗格型单纹孔。生长轮明显,晚材比例很小,表明当时的降雨量充沛,并为具有一定的季节性变化的热带或亚热带的气候条件。Fossil woods are petrified/permineralised tree trunks,and commonly preserved with detailed cell structures.They are important to understand the evolutionary history of wood anatomy and palaeoecology during the deep geological past.More than200 fossil wood species have been documented in China,however,except for a few records of the Palaeozoic and Cenozoic specimens,fossil wood has not been reported from the Mesozoic deposits of Yunnan Province.Here we describe,for the first time,a Mesozoic fossil wood,Xenoxylonsp.from Yunnan Province.The materials were obtained from the Middle Jurassic Shaximiao Formation,and represent the fragments of the secondary xylem.The wood consists of thick-walled tracheids and thin-walled rays.Uniseriate bordered pits are compressed and continuously present on the radial walls of tracheids.Each cross-field has one large,simple,window-like pit.The remarkable growth rings and narrow latewood indicate that the tree inhabited in a subtropical/tropical seasonal climate,with abundant rainfall.

关 键 词：Xenoxylon 木化石 古生态 沙溪庙组 侏罗纪 云南 

分 类 号：Q914.2[天文地球—古生物学与地层学]