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地球科学进展  2009, Vol. 24 Issue (9): 1024-1032    DOI: 10.11867/j.issn.1001-8166.2009.09.1024
云南腾冲上新统Carpinus miofangiana的发现及古气候意义
兰州大学资源环境学院,甘肃  兰州  730000
Carpinus miofangiana from the Pliocene of Tengchong in Yunnan Province and its Palaeoclimatic Significance
Dai Jing, Sun Bainian, Xie Sanping, Wu Jingyu, Li Na
College of Earth and Environment Science, Lanzhou University, Lanzhou 730000, China
 全文: PDF(4609 KB)  

      在云南省腾冲县上新统芒棒组发现了保存较好的被子植物化石密脉鹅耳枥Carpinus miofangiana Hu et Chaney。该种化石曾在我国山东山旺组有过报道,当前化石在叶形及叶脉特征上都和山旺的标本非常相似。进一步分析了化石叶片的角质层微细构造特征,并结合叶结构分析提高了对化石植物分类鉴定的准确性。基于化石Carpinus miofangiana与现生植物Carpinus fangiana 在生态环境及其结构特征上的相似性,将Carpinus fangiana 作为化石的现生对应种进行对比,并统计二者的气孔密度和气孔指数,用气孔比率的方法推测上新世的大气CO2浓度为464×10-6,基本上与Berner全球碳平衡模型GEOCARB III中CO2浓度变化曲线上的数值一致,说明C. miofangiana叶片可以作为古大气CO2浓度变化的生物指标。最后通过化石和现生叶片角质层的对比分析推断滇西地区上新世时气候比现在温暖湿润。

关键词: 密脉鹅耳枥表皮构造古气候上新世腾冲    

       A fossil leaf identified as Carpinus miofangiana Hu et Chaney was discovered in the Late Pliocene sediments of the Mangbang Formation, Tengchong Country, Yunnan Province, China. It was well preserved with gross morphological structure and microstructure of cuticles in situ. The gross morphological characteristics of it were similar to that of the fossil species Carpinus miofangiana from the Shanwang Formation in Shandong Province: both of them are oblong-ovate, base obliquely cordate, leaf margin doubly minutely serrate. Their primary veins are straight and moderately thick, secondary veins are pinnate. Additionally, the anatomical characteristics of the present specimen are investigated here and compared with the modern leaf Carpinus fangiana, it is more credible to decide the taxonomic position of fossil plant using leaf architecture and cuticular characteristics together. As both the fossil and modern species shared similar ecological habits and clearly possessed very similar gross morphological characteristics and epidermic features, Carpinus fangiana was selected to be the fossil species’s nearest living equivalent species for comparative study in stomatal index. Consequently, the palaeo-atmospheric CO2 concentration, 464ppmv, was estimated based on stomatal ratio approach. The result was consistent with the CO2 value of Berner’s global carbon budget model (GEOCARB III). It therefore suggested that the leaf of Carpinus miofangiana can be a good proxy for palaeo-CO2 levels. Based on the comparing in cuticular characteristics between the fossil and the modern leaves, it can be inferred that the climate was warmer and more humid in the Pliocene of western Yunnan than that of the present.

Key words: Carpinus miofangiana    cuticular structure    palaeoclimate    Pliocene    Tengchong
收稿日期: 2009-01-16 出版日期: 2009-09-10
:  P53  


通讯作者: 孙柏年(1955-),男,山东沂水人,教授,博导,主要从事古生物地层学的研究.     E-mail:
作者简介: 戴静(1984-),女,云南玉溪人,博士研究生,主要从事古生物地层学的研究.
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戴静,孙柏年,解三平,吴靖宇,李娜. 云南腾冲上新统Carpinus miofangiana的发现及古气候意义[J]. 地球科学进展, 2009, 24(9): 1024-1032.

Dai Jing, Sun Bainian, Xie Sanping, Wu Jingyu, Li Na. Carpinus miofangiana from the Pliocene of Tengchong in Yunnan Province and its Palaeoclimatic Significance. Advances in Earth Science, 2009, 24(9): 1024-1032.


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