Formation of hybrid N2O and hybrid N2 due to codenitrification: First review of a barely considered process of microbially mediated N-nitrosation

Spott, Oliver; Russow, R.; Stange, Claus Florian

doi:10.1016/j.soilbio.2011.06.014

Cited by 173 publications

(172 citation statements)

References 147 publications

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“…9 Furthermore, the promotion of Fe(III) reduction after 15 NH 4 + addition, together with the positive (P < 0.0001) correlation between Fe(III) reduction and 30 N 2 production rates, further provides strong evidence for the occurrence of Feammox in the chronosequence (Figures 2 and 3a).…”

Section: Nomentioning

confidence: 72%

“…N 2 O is produced in soils during various microbial processes, including aerobic nitrification, codenitrification, and denitrification. 9,30 In our study, aerobic nitrification was negligible, and codenitrification is also excluded as a potential source of 46 Proportion of Iron Reduction Associated with Feammox. Interestingly, the molar ratio of measured 30 N 2 to Fe(II) production following the addition of 15 NH 4 + alone does not match the stoichiometry shown in eq 1 in any of the soils, probably because only a minor proportion of the Fe(III) reduced was linked to the NH 4 + oxidation in the examined chronosequence.…”

Section: Nomentioning

confidence: 79%

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Nitrogen Loss through Anaerobic Ammonium Oxidation Coupled to Iron Reduction from Paddy Soils in a Chronosequence

Ding

et al. 2014

Environ. Sci. Technol.

265

161

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Anaerobic ammonium oxidation coupled to iron(III) reduction (termed Feammox) with dinitrogen, nitrite, or nitrate as the end-product is a recently discovered process of nitrogen cycling. However, Feammox has not been described in paddy soils, which are rich in iron(III) oxides and subjected to intensive nitrogen fertilization. Here, evidence for Feammox in a paddy soil chronosequence with a gradient of microbially reducible iron(III) levels was obtained in Southern China using 15 N-labeled ammonium-based isotopic tracing and acetylene inhibition techniques. Our study demonstrated the occurrence of Feammox in the chronosequence, and direct dinitrogen production was shown to be the dominant Feammox pathway. Within the chronosequence, three paddy soils with higher microbially reducible iron(III) levels had higher Feammox rates (ranged from 0.17 to 0.59 mg N kg −1 d −1 ) compared to an uncultivated soil (0.04 mg N kg −1 d −1 ). It is estimated that a loss of 7.8−61 kg N ha −1 year −1 is associated with Feammox in the examined paddy soils. Overall, we discover that rice cultivation could enrich microbially reducible iron(III), accelerate Feammox reaction and thus fuel nitrogen loss from soils, and suggest that Feammox could be a potentially important pathway for nitrogen loss in paddy soils.

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Section: Nomentioning

confidence: 72%

Section: Nomentioning

confidence: 79%

Nitrogen Loss through Anaerobic Ammonium Oxidation Coupled to Iron Reduction from Paddy Soils in a Chronosequence

Ding

et al. 2014

Environ. Sci. Technol.

265

161

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“…4,5,17,18 Also, several pathways detailed in the following table make contribution to 29 N 2 production, but all of the pathways first required the anaerobic oxidation of ammonium.…”

Section: Nomentioning

confidence: 99%

Electron Shuttles Enhance Anaerobic Ammonium Oxidation Coupled to Iron(III) Reduction

Zhou

Yang

et al. 2016

Environ. Sci. Technol.

236

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Anaerobic ammonium oxidation coupled to iron(III) reduction, termed Feammox, is a newly discovered nitrogen cycling process. However, little is known about the roles of electron shuttles in the Feammox reactions. In this study, two forms of Fe(III) (oxyhydr)oxide ferrihydrite (ex situ ferrihydrite and in situ ferrihydrite) were used in dissimilatory Fe(III) reduction (DIR) enrichments from paddy soil. Evidence for Feammox in DIR enrichments was demonstrated using the 15N-isotope tracing technique. The extent and rate of both the 30N2–29N2 and Fe(II) formation were enhanced when amended with electron shuttles (either 9,10-anthraquinone-2,6-disulfonate (AQDS) or biochar) and further simulated when these two shuttling compounds were combined. Although the Feammox-associated Fe(III) reduction accounted for only a minor proportion of total Fe(II) formation compared to DIR, it was estimated that the potentially Feammox-mediated N loss (0.13–0.48 mg N L–1 day–1) was increased by 17–340% in the enrichments by the addition of electron shuttles. The addition of electron shuttles led to an increase in the abundance of unclassified Pelobacteraceae, Desulfovibrio, and denitrifiers but a decrease in Geobacter. Overall, we demonstrated a stimulatory effect of electron shuttles on Feammox that led to higher N loss, suggesting that electron shuttles might play a crucial role in Feammox-mediated N loss from soils.

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“…Fungi can denitrify nitrate or nitrite via nitric oxide to nitrous oxide or reduce nitrite to ammonium via dissimilatory nitrate reduction to ammonium (DNRA) coupled to the oxidation of organic compounds (17,18,23). There is no evidence of the presence of nitrous oxide reductase and complete denitrification to N 2 in fungi, but fungi may produce N 2 through codenitrification (17,19,24).…”

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confidence: 99%

Watershed-Scale Fungal Community Characterization along a pH Gradient in a Subsurface Environment Cocontaminated with Uranium and Nitrate

Jasrotia

Green

Canion

et al. 2014

Appl Environ Microbiol

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The objective of this study was to characterize fungal communities in a subsurface environment cocontaminated with uranium and nitrate at the watershed scale and to determine the potential contribution of fungi to contaminant transformation (nitrate attenuation). The abundance, distribution, and diversity of fungi in subsurface groundwater samples were determined using quantitative and semiquantitative molecular techniques, including quantitative PCR of eukaryotic small-subunit rRNA genes and pyrosequencing of fungal internal transcribed spacer (ITS) regions. Potential bacterial and fungal denitrification was assessed in sediment-groundwater slurries amended with antimicrobial compounds and in fungal pure cultures isolated from the subsurface. Our results demonstrate that subsurface fungal communities are dominated by members of the phylum Ascomycota, and a pronounced shift in fungal community composition occurs across the groundwater pH gradient at the field site, with lower diversity observed under acidic (pH <4.5) conditions. Fungal isolates recovered from subsurface sediments, including cultures of the genus Coniochaeta, which were detected in abundance in pyrosequence libraries of site groundwater samples, were shown to reduce nitrate to nitrous oxide. Denitrifying fungal isolates recovered from the site were classified and found to be distributed broadly within the phylum Ascomycota and within a single genus of the Basidiomycota. Potential denitrification rate assays with sediment-groundwater slurries showed the potential for subsurface fungi to reduce nitrate to nitrous oxide under in situ acidic pH conditions.

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Formation of hybrid N2O and hybrid N2 due to codenitrification: First review of a barely considered process of microbially mediated N-nitrosation

Cited by 173 publications

References 147 publications

Nitrogen Loss through Anaerobic Ammonium Oxidation Coupled to Iron Reduction from Paddy Soils in a Chronosequence

Nitrogen Loss through Anaerobic Ammonium Oxidation Coupled to Iron Reduction from Paddy Soils in a Chronosequence

Electron Shuttles Enhance Anaerobic Ammonium Oxidation Coupled to Iron(III) Reduction

Watershed-Scale Fungal Community Characterization along a pH Gradient in a Subsurface Environment Cocontaminated with Uranium and Nitrate

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