Machilus Fossil from Miocene in Tiantai, Zhejiang Province, China, and Its Paleoenvironmental Implications
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摘要: 对浙江天台中新统下南山组6块叶片压型化石——天台润楠Machilus tiantaiensis Ding S. T. et Sun B. N. sp. nov.,并对其叶结构和表皮构造特征进行了详细的研究.其主要特征为:叶椭圆形,全缘,顶端渐尖,基部楔形,侧脉羽状;表皮细胞垂周壁浅波状,单细胞毛基多集中于脉络区;气孔下生式,气孔器短平列型,副卫细胞1~2个.通过与现生植物进行对比分析,发现当前标本的叶结构和表皮构造特征与樟科润楠属(Machilus)十分一致.利用PAST(palaeontological statistics)软件对我国润楠属68种植物叶片的形态特征进行聚类分析,结果表明当前化石与M. pingii Cheng ex Yang最为接近;角质层分析也表明二者的表皮构造最为相似.利用化石与其现存最近亲缘种M. pingii的气孔比率,恢复了天台晚中新世的古大气CO2体积分数为407.9×10-6.此外,依据现生润楠属主要分布于亚洲东南部和南部的热带、亚热带地区,推断天台地区中新世的古气候较为温暖湿润.Abstract: Six fossil leaves with fine venation and well-preserved cuticles of Machilus tiantaiensis Ding S. T. et Sun B. N. sp. nov. (Lauraceae) were discovered from the Late Miocene Xiananshan Formation of Tiantai County, eastern Zhejiang Province, China. The fossils were characterized by elliptic shape with entire margin, acuminate apex, cuneate base and pinnate venation; the anticlinal walls of epidermal cells are undulated, the unicellular trichome bases are mostly found on the veins; leaves hypostomatic, stomata paracytic with two embedded guard cells and one or two subsidiary cells. The leaf cuticular and architectural features of these fossil leaves suggest the affinity within the genus Machilus. The quantitative traits of leaf morphology were studied here, and a free data analysis package (palaeontological statistics) is utilized for cluster analysis. The leaf morphologic and cuticular features show that the fossil is similar to the modern leaves of M. pingii mostly. The paleoatmospheric CO2 concentration is estimated through the stomatal ratio between the fossil species and the extant M. pingii Cheng ex Yang (nearest living relative of the fossil species), and the result shows that the level of atmospheric CO2 in the Late Miocene of Tiantai is about 407.9×10-6. The modern trees of Machilus are distributed in tropical and subtropical regions of South and Southeast Asia, which indicates that the Miocene climate of eastern China was warm and humid.
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Key words:
- Machilus /
- cuticle /
- cluster analysis /
- plant fossils /
- paleoenvironment /
- Miocene /
- climate change
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图 2 Machilus tiantaiensis和M. pingii的叶结构特征
a~g.M. tiantaiensis手标本;a.标本号:JH14147;b.标本号:JH14276;c.标本号:JH14271;d.标本号:JH14282;e.标本号:JH14643A;f.标本号:JH14643B;g.标本号:JH14585;h.M. pingii;标本号:LUP080918;i.M. tiantaiensis,示脉络结构,标本号:JH14585;j.化石叶片素描图,标本号:JH14147;k.现生叶片素描图,标本号:LUP080918.a~h, j, k的标尺=1.0 cm;i的标尺=0.5 cm
Fig. 2. Leaf architectures of Machilus tiantaiensis and M. pingii
图 3 在光学显微镜(LM)下M. tiantaiensis、M. pingii和M. yunnanensis角质层特征
a.M. tiantaiensis上表皮,箭头示垂周壁,标本号:JH14643;b.M. tiantaiensis下表皮,箭头示气孔器,标本号:JH14147;c.M. tiantaiensis下表皮,箭头分别示脉络和毛状体,标本号:JH14585;d.M. pingii上表皮,箭头示垂周壁,标本号:LUP080918;e.M. pingii下表皮,箭头分别示气孔器和毛状体,标本号:LUP080918;f.M. pingii下表皮,箭头示脉络,标本号:LUP080918;g.M. pingii下表皮,箭头示气孔器,标本号:LUP080918;h.M. yunnanensis上表皮,箭头示垂周壁,标本号:LUP061012;i.M. yunnanensis下表皮,箭头示气孔器,标本号:LUP061012.a, b, d, e, h, i的标尺=50 μm;c, f的标尺=100 μm;g的标尺=10 μm
Fig. 3. Cuticular characteristics of Machilus tiantaiensis, M. pingii and M. yunnanensis under the light microscopy
图 4 在扫描电镜(SEM)下M. tiantaiensis和M. pingii角质层特征
a.M. tiantaiensis下表皮内面观,标本号:JH14147;b.M. tiantaiensis下表皮内面观,标本号:JH14147;c.M. tiantaiensis下表皮外面观,标本号:JH14282;d.M. pingii下表皮外面观,标本号:LUP080918;e.M. tiantaiensis下表皮,示气孔器,标本号:JH14147;f.M. pingii下表皮,示气孔器,标本号:LUP080918.a的标尺=100 μm;b~d的标尺= 50 μm;e, f的标尺=10 μm
Fig. 4. Cuticular characteristics of M. tiantaiensis and M. pingii under the scanning electron microscope
表 1 分类性状及编码
Table 1. Taxonomic characters and codes
序号 分类性状及编码 1 叶片长度(cm) 2 叶片宽度(cm) 3 叶片长/叶片宽 4 叶基形状:楔形(0);宽楔形或圆形(1);钝(2);下延或急短尖(3) 5 叶顶:渐尖(0);尾状渐尖(1);短尖(2);钝或圆(3) 6 叶片质地:坚纸质(0);薄革质(1);革质(2);厚革质(3) 7 叶侧脉数(对):<7(0);7~9(1);9~12(2);>12(3) 8 侧脉与中脉的夹角:<30°(0);30°~45°(1);45°~60°(2);>60°(3) 表 2 润楠属叶化石记录
Table 2. Leaf fossil records of genus Machilus
种名 叶形 大小(cm) 叶顶 叶基 叶缘 侧脉(对) 时代 地点 参考文献 M. thunbergii 披针形、椭圆形 (10.3~11.5)×(1.9~5.0) 短尖 楔形 全缘 9~10 早更新世 广西百色 刘裕生,1993 M. oreophila 披针形 15.2×3.8 短尖 楔形 全缘 15 早更新世 广西百色 刘裕生,1993 M. leplophylla 倒卵状长圆形 15.0×5.0 - 楔形 全缘 >10 上新世 云南腾冲 吴靖宇等,2008 M. cf. longipedicellata 长椭圆形 18.0×5.0 渐尖 楔形 全缘 10 上新世 云南腾冲 吴靖宇等,2008 M. americana 椭圆状披针形 4.7×1.9 - 楔形 全缘 - 晚中新世 云南开远 周浙昆,2000 M. ugoana 椭圆状倒披针形 5.9×1.8 - 楔形 全缘 >8 晚中新世 云南开远 周浙昆,2000 M. ugoana - 8.0×2.5 - 楔形 全缘 - 中中新世 日本岐阜 Ina, 2004 M. nathorsti 卵圆形 8.0×3.0 渐尖 狭楔 全缘 6 中中新世 日本岐阜 Ina, 2004 M. ugoana 椭圆形,长椭圆形,椭圆状披针形 (4.8~11.2)×(1.7~4.0) 渐尖 楔形 全缘 10~12 中新世 日本兵库 Uemura, 2005 M. ugoana 披针形 9.7×2.3 短尖 狭楔 全缘 9 早中新世 日本本州 Yabe, 2008 M. nathorsti - - 渐尖 全缘 - 早中新世 日本本州 Yabe, 2008 M. ugoana 椭圆状披针形 7.0×1.7 - - 全缘 7 渐新世 云南景谷 中国新生代植物编写组,1978 M. tiantaiensis 椭圆形,卵状椭圆形 (4.1~6.5)×(2.0~2.8) 渐尖 楔形 全缘 7~9 晚中新世 浙江天台 本文 表 3 植物化石M. tiantaiensis与3种叶结构关系较近的现生润楠属植物叶片角质层特征
Table 3. Characteristics and correlations of the cuticle from M. tiantaiensis and extant three species of Machilus
种类 上表皮 下表皮 参考文献 细胞形状 垂周壁 细胞形状 垂周壁 气孔密度(个/mm2) 气孔器长(μm) (μm) 气孔器长宽比 气孔器分布 表皮毛 M. pingii 不规则 浅波状 不规则 弧形或浅波状 430 22.5 20.6 1.09 星状 有 本文 M. yunnanensis 不规则 深波状 不规则 浅波状 420 17.4 16.2 1.07 星状 无 本文 M. thunbergii 4~5边形 平直 不规则 平直 248 15.5 15.5 1.00 群状 无 * M. tiantaiensis 不规则 浅波状 不规则 浅波状 488 21.7 20.5 1.06 星状 有 本文 注:星号表示据林夏珍,2007b;气孔密度、气孔器长和气孔器宽均指平均值. 表 4 M. tiantaiensis和M. pingii下表皮气孔参数
Table 4. Stomatal parameters of the lower surface of M. tiantaiensis and M. pingii
种类 数据组序号 气孔密度(SD,个/mm2) 表皮细胞密度(ED,个/mm2) 气孔指数(SI,%) M. tiantaiensis 1 436 2 956.0 12.9 2 496 3 527.0 12.3 3 452 3 115.0 12.7 4 512 3 484.0 12.8 5 507 3 646.5 12.2 6 487 3 643.5 11.8 7 529 3 811.5 12.2 平均值 488(±31) 12.4(±0.4) M. pingii 1 420 2 830.0 12.9 2 439 2 864.5 13.3 3 435 2 844.5 13.3 4 396 2 675.0 12.9 5 439 2 767.5 13.7 6 528 3 722.0 12.4 7 493 3 280.5 13.1 平均值 450(±42) 13.1(±0.4) -
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