Carbon isotope fractionation in phytoplankton as a potential proxy for pH rather than for [CO2(aq)]: Observations from a carbonate lake
Carbon isotope fractionation in phytoplankton as a potential proxy for pH rather than for [CO2(aq)]: Observations from a carbonate lake
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浮游植物中的碳同位素分馏作为 pH 值而不是 [CO2(aq)] 的潜在代理：碳酸盐湖的观测
DOI：
10.1002/lno.10289
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发表时间：
2016-07
影响因子：
4.5
通讯作者：
Lu Weiqi
中科院分区：
文献类型：
--
作者：
Wang Shilu;Yeager Kevin M.;Lu Weiqi
由于浮游植物光合作用过程中碳同位素分馏(εp)主要受水生CO2浓度([CO2(Aq)])控制，利用沉积物中有机质碳同位素特征重建古大气CO2水平的方法受到了质疑。因此，块状沉积有机质的碳同位素数据反映了什么是一个谜。在本研究中，我们测定了位于碳酸盐地区的湖泊中溶解无机碳和颗粒有机碳的碳同位素组成。用偏相关分析区分了控制εp的直接和间接因素。结果表明，εp与pH的关系比与[CO2(Aq)]的关系更密切、更稳定，这与我们对浮游植物利用二氧化碳和二氧化碳的生理学的最新进展是一致的。因此，我们认为浮游植物中碳同位素分馏比[CO2(AQ)]更适合作为pH的替代物。这项修正的一个好处是，关于浮游植物吸收碳的主要物种的信息也同样包括在内。在未来的培养实验中，为了揭示pH和细胞碳同位素特征之间的关系，有必要构建一个新的同位素分馏公式来耦合CO2和的不同影响，这对于提高对碳同位素分馏的理解，以及更精确地模拟pH和CO2是至关重要的。
The method of reconstructing paleoatmospheric CO2levels using carbon isotope signatures of organic matter buried in sediments has been questioned due to the dubious foundation that carbon isotope fractionation during phytoplankton photosynthesis (εp) is controlled primarily by aquatic CO2concentration ([CO2(aq)]). Consequently, what carbon isotope data from bulk sedimentary organic matter reflects is a puzzle. In this study, we determined the carbon isotope compositions of dissolved inorganic carbon and particulate organic carbon in a lake located in a carbonate area. Partial correlation analysis was employed to distinguish between direct and indirect factors in controllingεp. The results show thatεpis more closely, and more steadily related with pH than with [CO2(aq)], which is in accordance with recent advances in our understanding of the physiology of carbon utilization by phytoplankton for CO2and . Therefore, we propose that carbon isotope fractionation in phytoplankton is more suitable as a proxy of pH than of [CO2(aq)]. One advantage of this amendment is that information on , the main species of carbon uptake by phytoplankton, is likewise included. In the future, culture experiments aiming at revealing the relationship between pH and cellular carbon isotope signatures is necessary to construct a new isotope fractionation formula to couple the different effects of CO2and , which is of critical importance to improve the understanding of carbon isotope fractionation, and to more precisely model pH and CO2.
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影响因子：
3
作者：
M. Hofmann;D. Wolf-Gladrow;Taro Takahashi;Steward C Sutherland;K. Six;E. Maier‐Reimer
通讯作者：
M. Hofmann;D. Wolf-Gladrow;Taro Takahashi;Steward C Sutherland;K. Six;E. Maier‐Reimer
影响因子：
1.8
作者：
J. Raven;J. Beardall
通讯作者：
J. Raven;J. Beardall
影响因子：
4.5
作者：
Cassar, N;Laws, EA;Bidigare, RR
通讯作者：
Bidigare, RR
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
5.2
作者：
HINGA, KR;ARTHUR, MA;WHITAKER, D
通讯作者：
WHITAKER, D