浙江宁海早上新世枫香树属和栎属化石木及其古环境意义  

Identification of the early Early Pliocene fossil woods from Ninghai in Zhejiang Province and its palaeoenvironmental implications

作　　者：程业明[1] 扆铁梅[2] 李承森[3] 

机构地区：[1]中国地质博物馆,北京100034 [2]北京市科学技术情报研究所,北京100120 [3]中国科学院植物研究所,北京100093

出　　处：《古地理学报》2013年第1期105-112,共8页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:31170206)资助

摘　　要：对发现于浙江省宁海县茶园乡道士桥村附近的上新统嵊县群中的多个化石木材料进行了解剖研究,并对其分类和系统位置进行了讨论。根据解剖特征鉴定出2种化石木。一种为久内枫香树(Liquidambar hisauchi),属于金缕梅科枫香树属,其组合特征为:生长轮明显;散孔材;梯状穿孔板具横隔10～23条;螺纹加厚仅出现在导管末端;导管直径在50～100μm之间;射线宽1～3列。另一种为岛仓栎(Quercus shimakurae),属于壳斗科栎属,其组合特征为:生长轮极明显;环孔材;单管孔;晚材管孔火焰状径列;早材管孔直径最大达300μm,明显比晚材管孔大;单穿孔;轴向薄壁组织星散聚合状和离管带状;射线具单列和极宽2种类型。本研究从大化石角度进一步证明栎属和枫香树属为当时植被的重要组成成分。Fossil woods were collected from the Lower Pliocene Shengxian Group near Daoshiqiao vil- lage of Chayuan Town, Ninghai County of Zhejiang Province. The specimens were examined microscopi- cally to determine taxonomic affinities. Two fossil taxa were identified based on anatomical characters. One wood is Liquidambar hisauchi of Hamamelidaceae. Its combined characteristics include distinct growth ring, diffuse-porous wood, scalariform perforation plate with 10-23 bars, helical thickenings only in the end of vessels, vessel diameters between 50-100 p^m and ray width between 1-3 seriates. The other one is Quercus shimakurae of Fagaceae. Its combined characteristics include very distinct growthring, ring-porous wood, solitary pore, vessel-ray pitting in paliform, simple perforation, axial parenchy- ma diffuse-in-aggregate and banded apotrachea｜, uni-seriate or very wide rays. Results of the palynomor- ph assemblage research indicate that the vegetation of this period was subtropical evergreen and deciduous broad-leaved mixed forest and Liquidambar and Quercus were the dominant.

关 键 词：化石木 早上新世 浙江省 枫香树属 栎属 

分 类 号：Q914.21[天文地球—古生物学与地层学]