N₂O formation by nitrite-induced (chemo)denitrification in coastal marine sediment.

ABSTRACT: Nitrous oxide (N₂O) 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 N₂O. Here, using microcosms, we quantified N₂O 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 N₂O formation was caused by chemodenitrification, whereas 75-85% of total N₂O was potentially produced by microbial N-transformation processes. An increase in (chemo)denitrification-based N₂O formation and associated Fe(II) oxidation caused an upregula

SUBMITTER: Otte JM 

PROVIDER: S-EPMC6668465 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature