Coupled nitrification and N(2) gas production as a cryptic process in oxic riverbeds.
Coupled nitrification and N(2) gas production as a cryptic process in oxic riverbeds.
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DOI：
10.1038/s41467-021-21400-3
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发表时间：
2021-02-22
影响因子：
16.6
通讯作者：
Trimmer M
中科院分区：
文献类型：
--
作者：
Ouyang L;Thamdrup B;Trimmer M
硝化作用和氮气生产之间的耦合，将氨循环回大气，是氮循环中的关键步骤，已经得到了广泛的研究。这类研究的一个假设是，硝化作用的产物(亚硝酸盐或硝酸盐)在还原为氮气之前在环境中自由混合。在这里，我们表明，在好氧河床中，氨产生氮气的模式与反硝化或厌氧氨氧化的预测模式相差约3-到16倍，反硝化或厌氧氨氧化以亚硝酸盐或硝酸盐作为自由孔隙水作为中间体。相反，这些模式与通过一个神秘的水池进行耦合的模式相匹配，该水池与孔隙水隔离。一个神秘的气体池挑战了我们对氮循环中关键步骤的理解，并掩盖了我们区分20年来研究试图识别的氮气来源的能力。我们的推理表明了氮循环中一种新的途径或已知途径之间的一种新型耦合。氮循环涉及复杂的微生物介导的铵、亚硝酸盐和硝酸盐之间的穿梭，以及对气候重要的温室气体副产物。在这里，作者利用河流沉积物中的同位素标记实验，在硝化作用和通过产生氮气去除固定氮之间的氮循环中发现了一个神秘的新步骤。
The coupling between nitrification and N2 gas production to recycle ammonia back to the atmosphere is a key step in the nitrogen cycle that has been researched widely. An assumption for such research is that the products of nitrification (nitrite or nitrate) mix freely in the environment before reduction to N2 gas. Here we show, in oxic riverbeds, that the pattern of N2 gas production from ammonia deviates by ~3- to 16-fold from that predicted for denitrification or anammox involving nitrite or nitrate as free porewater intermediates. Rather, the patterns match that for a coupling through a cryptic pool, isolated from the porewater. A cryptic pool challenges our understanding of a key step in the nitrogen cycle and masks our ability to distinguish between sources of N2 gas that 20 years’ research has sought to identify. Our reasoning suggests a new pathway or a new type of coupling between known pathways in the nitrogen cycle. The N cycle involves complex, microbially-mediated shuttling between ammonium, nitrite and nitrate, with climatically important greenhouse gas byproducts. Here the authors use isotope labeling experiments in river sediments and find a cryptic new step in the N cycle between nitrification and the removal of fixed N through N2 gas production.
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