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地球科学进展  2005, Vol. 20 Issue (6): 618-626    DOI: 10.11867/j.issn.1001-8166.2005.06.0618
研究论文     
晚中新世植被变更与光合作用演化
贺娟,汪品先
同济大学海洋地质国家重点实验室,上海 200092
VEGETATION CHANGE IN LATE MIOCENE AND EVOLUTION OF PHOTOSYNTHESIS
HE Juan; WANG Pinxian
Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(196 KB)  
摘要:

光合作用酶Rubisco出现于太古代,对于以后地质时期里大气的CO2降低并不适应。晚中新世大幅度扩展的C4植物,就是光合作用演化的一种途径,适应于CO2浓度较低的大气,也适应于温暖而季节性干旱的季风气候。C4与C3植物碳同位素的重大差异,又为利用古土壤和哺乳类牙齿珐琅质的δ13C分辨C3、C4植物在植被中的比例提供了条件。自从发现巴基斯坦晚中新世古土壤层δ13C突变以来的10余年,围绕着C4植物扩展究竟反映季风气候,CO2浓度下降,还是干旱化,国内外学术界展开了热烈的讨论,至今尚属未解之谜,但从中可以吸取研究地球系统演变的经验教训。

关键词: C4植物C3植物Rubisco光合作用晚中新世    
Abstract:

Rubisco, an ancient photosynthetic enzyme of Archean origin, became increasingly inefficient with reduction of atmospheric CO2 levels in the later geological history. The remarkable expansion of C4 biomass in late Miocene was an adaptive evolution in photosynthesis, as C4 photosynthesis was more adaptive to the lower concentration of CO2, as well as to monsoonal climate with warmer temperature and seasonal aridity. Given the significant difference in carbon isotope between C3 and C4 plants, the δ13C of paleosols and mammalian tooth enamels was widely used as an indicator of proportions of C3 to C4 plants in vegetation. Since the discovery of the dramatic shift of δ13C in the late Miocene paleosol from Pakistan over 10 years ago, the expansion of C4 biomass then has become a matter of hot debate within the scientific community: whether it was caused by monsoon climate, decreasing atmospheric CO2 level, or aridification?Though it remains an enigma up to now, there are useful lessons to be drawn from a brief review of the story as presented in this paper.

Key words: C4 plants    C3 plants    Rubisco    Photosynthesis    Late-Miocene.
收稿日期: 2004-06-07 出版日期: 2005-06-25
:  P5  
基金资助:

国家重点基础研究发展规划项目“地球圈层相互作用中的深海过程和深海记录”(编号:G2000078500)资助.

通讯作者: 贺娟   
作者简介: 贺娟(1980-),女,陕西延安人,博士研究生,主要从事孢粉与古环境研究. E-mail: crsytaljoy@163.com
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引用本文:

贺娟;汪品先. 晚中新世植被变更与光合作用演化[J]. 地球科学进展, 2005, 20(6): 618-626.

HE Juan;WANG Pinxian. VEGETATION CHANGE IN LATE MIOCENE AND EVOLUTION OF PHOTOSYNTHESIS. Advances in Earth Science, 2005, 20(6): 618-626.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2005.06.0618        http://www.adearth.ac.cn/CN/Y2005/V20/I6/618

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