Carbon isotopic fractionation by plankton in the Southern Indian Ocean:: relationship between δ13C of particulate organic carbon and dissolved carbon dioxide
Carbon isotopic fractionation by plankton in the Southern Indian Ocean:: relationship between δ13C of particulate organic carbon and dissolved carbon dioxide
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DOI：
10.1016/s0924-7963(98)00028-1
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发表时间：
1998-11-01
影响因子：
2.8
通讯作者：
Poisson, A
中科院分区：
文献类型：
--
作者：
Bentaleb, I;Fontugne, M;Poisson, A
同时测量了浮游植物中的叶绿素a、羧化酶活性（Rubisco和β羧化酶）、悬浮颗粒有机物的有机碳含量和同位素组成（δ（13）C（（POC）））以及表层海水中的二氧化碳分压1992年夏末，在南印度洋进行。结果表明，在副热带辐合带（STC）两侧的浮游生物种群表现出不同的碳代谢。北STC，浮游生物群落似乎占主导地位的mixo/异养，而南STC，生理（β C/R比）或生物量（C-（POC）/叶绿素）参数的特点是自养浮游植物。这两个种群的溶解CO2和SPOM之间的同位素分馏（δ（p））不同。只有三角洲（13）C值的植物群占主导地位的硅藻南部的STC部分表现出很强的相关性与溶解的CO2浓度，允许这些参数之间的关系为南大洋。
Simultaneous measurements of chlorophyll a, carboxylase activities (Rubisco and beta carboxylases) in phytoplankton, organic carbon content and isotopic composition (delta(13)C((POC))) Of suspended particulate organic matter, and partial pressure of carbon dioxide in surface seawater were performed during the end of summer 1992, in the South Indian Ocean. Results indicate that plankton populations display different carbon metabolisms on both sides of the subtropical convergence (STC). North of STC, planktonic communities appeared to be dominated by mixo/heterotrophs, while south of STC, physiological (beta C/R ratio) or biomass (C-(POC)/Chl) parameters are characteristic of autotrophic phytoplankton. The isotopic fractionation (epsilon(p)) between dissolved CO2 and SPOM is different for these two populations. Only delta(13)C values of flora dominated by diatoms south of the STC part showed a strong correlation with dissolved CO2 concentrations which permitted a relationship between these parameters for the Southern Ocean.