基于银杏(Ginkgo)与水杉(Metasequoia)叶化石气孔指数的新生代大气CO₂浓度记录  

Cenozoic CO2 Concentration History Based on Ginkgo and Metasequoia Stomatal Index

作　　者：王雨晴 

机构地区：[1]台州科技职业学院农业与生物工程学院,浙江 台州

出　　处：《气候变化研究快报》2023年第4期774-786,共13页Climate Change Research Letters

摘　　要：大气CO2浓度与地球气候变化有密切的关系,通过重建高精度、高分辨率的古大气CO2浓度探索大气CO2浓度与气候变化之间的关系是当今地质学、古生物学等领域研究的热点之一。银杏(Ginkgo)与水杉(Metasequoia)是两类广为人知的孑遗植物,其叶化石的气孔指数是重建新生代古大气CO2浓度常用的代用指标。但是,不同学者的研究在气孔指数计数方法、古大气CO2浓度转换等过程中的标准并不统一,导致重建的古大气CO2浓度误差较大。因此,本研究对前人已发表的银杏和水杉叶化石的研究进行整理,共收集92个银杏和26个水杉叶片化石气孔指数数据,按照统一的方法重建新生代各个时期的大气CO2浓度,并进一步探讨新生代大气CO2浓度变化与古温度变化之间的关系。The variation of atmospheric CO2 concentration is believed closely related to the present global warming, and paleo-CO2 reconstruction with high precision and high resolution has become one of the hot topics of geology and paleontology recently. Ginkgo and Metasequoia are two well-known relict taxa, whose leaf fossils are abundant throughout the Cenozoic era, and stomatal index of their leaf fossils is one of the most commonly used paleo-CO2 proxies. However, different studies have different standards in stomatal index counting methods and paleo-atmospheric CO2 concentration estimation methods, leading to large inconsistence in their results. In this study, previously published stomatal index data of 92 Ginkgo leaves and 26 Metasequoia leaves were collated, and then the atmospheric CO2 concentration history of the Cenozoic were reconstructed. The relationship between the Cenozoic atmospheric CO2 concentration and paleo-temperature was further discussed.

关 键 词：气候变化 叶化石 气孔指数 新生代 银杏 水杉 

分 类 号：R28[医药卫生—中药学]