Nitrous Oxide Dynamics in Agricultural Peat Soil in Response to Availability of Nitrate, Nitrite, and Iron Sulfides

Drained agricultural peat soils are potential hot spots of nitrous oxide (N 2 O) emissions, but the biogeochemical basis for distinctively large emissions is still unclear. Incubation experiments with acidic bog peat, using nitrate (NO 3 − ), nitrite (NO 2 − ), synthetic iron monosulfide (FeS), and...

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Bibliographic Details
Published in:Geomicrobiology journal 2020-01, Vol.37 (1), p.76-85
Main Authors: Taghizadeh-Toosi, Arezoo, Clough, Tim, Petersen, Søren O., Elsgaard, Lars
Format: Article
Language:English
Subjects:
Biogeochemical cycling
Biogeochemistry
Bogs
Denitrification
Emissions
Incubation period
Iron
Iron sulfides
Nitrates
Nitrites
Nitrogen dioxide
Nitrous oxide
Oxidation
Peat
Peat soils
Pyrite
Soil
Soil dynamics
Sulfides
wetland
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Summary:Drained agricultural peat soils are potential hot spots of nitrous oxide (N 2 O) emissions, but the biogeochemical basis for distinctively large emissions is still unclear. Incubation experiments with acidic bog peat, using nitrate (NO 3 − ), nitrite (NO 2 − ), synthetic iron monosulfide (FeS), and ground natural pyrite (FeS 2 ), suggested that heterotrophic denitrification of nitrate and nitrite was a major potential source of N 2 O in the peat soil. Neither FeS nor FeS 2 amendment affected N 2 O production and therefore high production potentials of N 2 O were not a result of interactions between N oxyanions and iron sulfides, such as chemolithoautotrophic pyrite oxidation.
ISSN:0149-0451
1521-0529
DOI:10.1080/01490451.2019.1666192