云南保山上新统黄背栎Quercus pannosa Hand.Mazz.角质层特征及古环境意义  

CUTICULAR STRUCTURE OF QUERCUS PANNOSA HAND.-MAZZ. FROM THE PLIOCENE IN BAOSHAN, YUNNAN PROVINCE AND ITS PALAEOENVIRONMENTAL SIGNIFICANCE

作　　者：肖良[1] 孙柏年[1] 阎德飞[1] 解三平[1] 韦利杰[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室与资源环境学院,兰州730000

出　　处：《微体古生物学报》2006年第1期23-30,共8页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(No.40372012);教育部科学技术研究重点项目(No.104177);国家重点基础研究发展计划项目((No.2006CB701400);甘肃省自然科学基金(No.ZS031A25002Z);兰州大学交叉学科青年创新研究基金(No.LZU200310)资助

摘　　要：在滇西保山上新统首次发现了黄背栎(Quercuspannosa)压型化石,并分析了角质层构造。其特征主要为:上表皮无气孔器,表皮细胞为不规则形五边形,垂周壁微弯曲,脉络为网格状,无毛基;下表皮具环列型气孔器,表皮细胞为不规则形五边形,垂周壁微弯曲,脉络为五边形的网格状,具毛基,毛的根部由多细胞组成,毛基部的细胞特化成辐射状。利用现存最近亲缘种(NLRspecies)原理,并比较化石和现生Q.pannosa角质层特征,推断上新世Q.pannosa在羊邑生长的古环境比现生Q.pannosa生存的冷湿气候相对干旱,且化石Q.pannosa为近原地埋藏。The compressions of fossil Quercus pannosa were found from the Pliocene in Baoshan, Western Yunnan and the cuticular structure of Quercus pannosa was carefully analyzed. The epidermal characteristics are as follows： no stomata in upper epidermis, cells from irregularity to pentagon in shape, cell anticlinal walls slightly curved, venation cancellate, no trichome base; stomata cyclocytic in lower epidermis, cells from irregularity to pentagon in shape, cell anticlinal walls slightly curved, venation pentagonal cancellate, the trichome base consisting of multicellular trichome foot and radial trichome basal cells. The comparison of cuticular structure between fossil and extant Q. pannosa based on the principle of the nearest living relative species suggests that the palaeoenvironment of Yangyi where fossil Q. pannosa lived in Pliocene is more arid than the cold-humid climate in which extant Q. pannosa lives and the fossil Q. pannosa is of near burial in situ.

关 键 词：黄背栎 化石角质层 上新世 古环境 滇西 

分 类 号：Q914[天文地球—古生物学与地层学]