Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific.
Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific.
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DOI：
10.1038/ncomms13451
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发表时间：
2016-12-01
影响因子：
16.6
通讯作者：
Purdy, Kevin J.
中科院分区：
文献类型：
--
作者：
Trimmer, Mark;Chronopoulou, Panagiota-Myrsini;Maanoja, Susanna T.;Upstill-Goddard, Robert C.;Kitidis, Vassilis;Purdy, Kevin J.
海洋含氧最低区是强效温室气体 N2O 的重要来源，但其微生物来源尚不清楚。我们使用 15NO2− 描述了 N2O 产生对氧斜线内部和下方 1 至 30μmol O2 l−1 之间氧气减少的指数响应，这种关系沿北太平洋 550 公里近海横断面保持。 N2O 产生总量的差异是由古菌功能基因丰度造成的。用我们实验得出的指数项进行参数化的一维 (1D) 模型准确地再现了水体顶部 350 米的 N2O 分布，并且与强烈的 45N2O 特征一起表明既没有典型的也没有硝化菌反硝化作用的产生，而统计模型支持古细菌的产生，可能是通过混合 N2O 的形成。此外，仅通过古菌 N2O 的产生，我们就可以平衡海空 N2O 交换的高分辨率估计。因此，N2O 的一个重要来源（之前被描述为细菌铵氧化的泄漏）可以通过最低氧区边缘的低氧古菌产生来更好地描述。 了解一氧化二氮 (N2O)（一种强效温室气体）海洋来源背后的生产过程至关重要。在这里，作者揭示了北太平洋古菌介导的 N2O 生产途径，该途径随着氧气的减少呈指数增加。
Oceanic oxygen minimum zones are strong sources of the potent greenhouse gas N2O but its microbial source is unclear. We characterized an exponential response in N2O production to decreasing oxygen between 1 and 30 μmol O2 l−1 within and below the oxycline using 15NO2−, a relationship that held along a 550 km offshore transect in the North Pacific. Differences in the overall magnitude of N2O production were accounted for by archaeal functional gene abundance. A one-dimensional (1D) model, parameterized with our experimentally derived exponential terms, accurately reproduces N2O profiles in the top 350 m of water column and, together with a strong 45N2O signature indicated neither canonical nor nitrifier–denitrification production while statistical modelling supported production by archaea, possibly via hybrid N2O formation. Further, with just archaeal N2O production, we could balance high-resolution estimates of sea-to-air N2O exchange. Hence, a significant source of N2O, previously described as leakage from bacterial ammonium oxidation, is better described by low-oxygen archaeal production at the oxygen minimum zone's margins. Understanding the production processes behind oceanic sources of nitrous oxide (N2O), a potent greenhouse gas, is of critical importance. Here, the authors reveal an archaeal-mediated N2O production pathway in the North Pacific, which increases exponentially with decreasing oxygen.
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影响因子：
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