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标题：N2O formation by nitrite-induced (chemo)denitrification in coastal marine sediment
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作者：Julia M. Otte ; Nia Blackwell ; Reiner Ruser 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2019
卷号：9
期号：1
页码：1-12
DOI：10.1038/s41598-019-47172-x
出版社：Springer Nature
摘要：Nitrous oxide (N 2 O) is a potent greenhouse gas that also contributes to stratospheric ozone depletion. Besides microbial denitrification, abiotic nitrite reduction by Fe(II) (chemodenitrification) has the potential to be an important source of N 2 O. Here, using microcosms, we quantified N 2 O formation in coastal marine sediments under typical summer temperatures. Comparison between gamma-radiated and microbially-active microcosm experiments revealed that at least 15-25% of total N 2 O formation was caused by chemodenitrification, whereas 75-85% of total N 2 O was potentially produced by microbial N-transformation processes. An increase in (chemo)denitrification-based N 2 O formation and associated Fe(II) oxidation caused an upregulation of N 2 O reductase (typical nosZ) genes and a distinct community shift to potential Fe(III)-reducers (Arcobacter), Fe(II)-oxidizers (Sulfurimonas), and nitrate/nitrite-reducing microorganisms (Marinobacter). Our study suggests that chemodenitrification contributes substantially to N 2 O formation from marine sediments and significantly influences the N- and Fe-cycling microbial community.