Nitrite Oxidation Across the Full Oxygen Spectrum in the Ocean
Nitrite Oxidation Across the Full Oxygen Spectrum in the Ocean
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DOI：
10.1029/2022gb007548
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发表时间：
2023-03
影响因子：
5.2
通讯作者：
Xin Sun;C. Frey;B. Ward
中科院分区：
文献类型：
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作者：
Xin Sun;C. Frey;B. Ward
固定氮限制了海洋表层大部分地区的初级生产力。亚硝酸盐氧化是硝酸盐的主要来源，硝酸盐是无机固定氮中最丰富的形式。即使被称为好氧过程，亚硝酸盐氧化并不总是由增加的氧浓度刺激，并且亚硝酸盐氧化发生在氧最小区（OMZ）的层中，其中氧是不可检测的。亚硝酸盐氧化细菌，自其最初分离作为需氧菌以来，也在这些层中检测到。亚硝酸盐氧化是否以及如何在缺氧海水中发生是有争议的。在这里，我们重新评估海洋亚硝酸盐氧化在OMZ地区使用以前的工作和新的数据集，我们收集了两个太平洋OMZ的最新进展。分析了亚硝酸盐氧化与氧的复杂关系。我们讨论了潜在的机制，解释亚硝酸盐氧化在不同层的OMZ最近的研究结果的基础上，并提出未来的方向，以解决有争议的问题，显然是厌氧亚硝酸盐氧化在缺氧层。
Fixed nitrogen limits primary productivity in most areas of the surface ocean. Nitrite oxidation is the main source of nitrate, the most abundant form of inorganic fixed nitrogen. Even though known as an aerobic process, nitrite oxidation is not always stimulated by increased oxygen concentration, and nitrite oxidation occurs in layers of oxygen minimum zones (OMZs) where oxygen is not detectable. Nitrite‐oxidizing bacteria, known since their original isolation as aerobes, were also detected in these layers. Whether and how nitrite oxidation is occurring in the anoxic seawater is debated. Here, we reassess recent advances in marine nitrite oxidation in OMZ regions using previous work and new data sets we collected in two Pacific OMZs. We analyze the complex relationship between nitrite oxidation and oxygen. We discuss potential mechanisms explaining nitrite oxidation in different layers of OMZs based on recent findings and propose future directions to resolve the controversial question of apparently anaerobic nitrite oxidation in anoxic layers.