C : N : P stoichiometry at the Bermuda Atlantic Time-series Study station in the North Atlantic Ocean
C : N : P stoichiometry at the Bermuda Atlantic Time-series Study station in the North Atlantic Ocean
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DOI：
10.5194/bg-12-6389-2015
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发表时间：
2015-11
期刊：
影响因子：
4.9
通讯作者：
Ashutosh Kumar Singh;S. Baer;U. Riebesell;A. Martiny;M. Lomas
中科院分区：
文献类型：
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作者：
Ashutosh Kumar Singh;S. Baer;U. Riebesell;A. Martiny;M. Lomas
抽象的。氮（N）和磷（P）的可用性，以及其他宏量和微量营养素，决定了海洋的碳（C）吸收的强度，而无机营养库中N：P比例的变化是浮游植物生长的关键。Alfred C. Redfield在大约80年前提出，表层海洋的生物过程控制着深海化学。最近的研究强调了无机N：P比值在控制海洋地球化学过程中的作用，特别是悬浮颗粒有机物（POM）中的C：N：P比值，而对输出POM和溶解有机物（DOM）的关注较少。在这里，我们扩展生态系统的C：N：P化学计量的讨论，但也研究化学计量关系的时间变化。我们分析了元素化学计量悬浮POM和总（POM + DOM）的有机物（TOM）池在上100米，并在出口POM和subbeuphotic区（100-500米）无机营养池收集的每月数据在百慕大大西洋时间序列研究（BATS）网站位于北大西洋西部。TOM中的C：N和N：P比至少是POM中的2倍，而TOM中的C：P比比POM中的那些高5倍。观察到的C：悬浮态POM中的N比近似等于Redfield比值（C：N：P = 106：16：1），而同一池中的N：P和C：P比是Redfield比值的2倍以上。地下无机营养库中的平均N：P比为~ 26：1，介于悬浮POM比和Redfield比之间。我们已经进一步链接到在BATS网站观察到的浮游植物细胞丰度的元素化学计量的变化。这项研究的结果表明，在真光层的元素比例随深度而变化，主要是由于不同的生长速率的蓝藻细胞。我们还研究了北极涛动对C：N：P化学计量的时间模式的作用。这项研究加强了我们对不同有机物池中元素化学计量的变化的理解，并应通过限制非Redfield化学计量的范围和池之间元素的净相对流动来改善生态地球化学模型。
Abstract. Nitrogen (N) and phosphorus (P) availability, in addition to other macro- and micronutrients, determine the strength of the ocean's carbon (C) uptake, and variation in the N : P ratio of inorganic nutrient pools is key to phytoplankton growth. A similarity between C : N : P ratios in the plankton biomass and deep-water nutrients was observed by Alfred C. Redfield around 80 years ago and suggested that biological processes in the surface ocean controlled deep-ocean chemistry. Recent studies have emphasized the role of inorganic N : P ratios in governing biogeochemical processes, particularly the C : N : P ratio in suspended particulate organic matter (POM), with somewhat less attention given to exported POM and dissolved organic matter (DOM). Herein, we extend the discussion on ecosystem C : N : P stoichiometry but also examine temporal variation in stoichiometric relationships. We have analyzed elemental stoichiometry in the suspended POM and total (POM + DOM) organic-matter (TOM) pools in the upper 100 m and in the exported POM and subeuphotic zone (100–500 m) inorganic nutrient pools from the monthly data collected at the Bermuda Atlantic Time-series Study (BATS) site located in the western part of the North Atlantic Ocean. C : N and N : P ratios in TOM were at least twice those in the POM, while C : P ratios were up to 5 times higher in TOM compared to those in the POM. Observed C : N ratios in suspended POM were approximately equal to the canonical Redfield ratio (C : N : P = 106 : 16 : 1), while N : P and C : P ratios in the same pool were more than twice the Redfield ratio. Average N : P ratios in the subsurface inorganic nutrient pool were ~ 26 : 1, squarely between the suspended POM ratio and the Redfield ratio. We have further linked variation in elemental stoichiometry to that of phytoplankton cell abundance observed at the BATS site. Findings from this study suggest that elemental ratios vary with depth in the euphotic zone, mainly due to different growth rates of cyanobacterial cells. We have also examined the role of the Arctic Oscillation on temporal patterns in C : N : P stoichiometry. This study strengthens our understanding of the variability in elemental stoichiometry in different organic-matter pools and should improve biogeochemical models by constraining the range of non-Redfield stoichiometry and the net relative flow of elements between pools.