Quantifying the contribution of nitrification and denitrification to the nitrous oxide flux using 15N tracers

Autor: Catherine Hénault, Francis Andreux, E. Baujard, Olivier Mathieu, Jean Lévêque, Marie-Jeanne Milloux
Přispěvatelé: Microbiologie du Sol et de l'Environnement (MSE), Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB), Work funded by the Conseil Régional de Bourgogne, Microbiologie du Sol et de l'Environnement ( MSE ), Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB )
Rok vydání: 2005
Předmět:
Greenhouse Effect
Denitrification
Health
Toxicology and Mutagenesis
[SDE.MCG]Environmental Sciences/Global Changes
Nitrous Oxide
Toxicology
chemistry.chemical_compound
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces
environment
Soil Pollutants
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Fertilizers
Water content
Biotransformation
Hydrology
Air Pollutants
Moisture
Bacteria
Nitrogen Isotopes
Chemistry
Stable isotope ratio
General Medicine
Nitrous oxide
Soil moisture content
[ SDU.STU.GC ] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Pollution
Nitrification
[ SDE.MCG ] Environmental Sciences/Global Changes
15N tracer
Environmental chemistry
Isotope Labeling
Soil water
Aeration
Environmental Monitoring
Zdroj: Environmental Pollution
Environmental Pollution, Elsevier, 2006, 144 (3), pp.933-940. ⟨10.1016/j.envpol.2006.02.005⟩
Environmental Pollution, Elsevier, 2006, 144 (3), pp.933-940. 〈10.1016/j.envpol.2006.02.005〉
ISSN: 0269-7491
1873-6424
DOI: 10.1016/j.envpol.2006.02.005⟩
Popis: 8 pages; International audience; Microbial transformations of nitrification and denitrification are the main sources of nitrous oxide (N2O) from soils. Relative contributions of both processes to N2O emissions were estimated on an agricultural soil using 15N isotope tracers (15NH4+ or 15NO3-), for a 10-day batch experiment. Under unsaturated and saturated conditions, both processes were significantly involved in N2O production. Under unsaturated conditions, 60% of N-N2O came from nitrification, while denitrification contributed around 85-90% under saturated conditions. Estimated nitrification rates were not significantly different whatever the soil moisture content, whereas the proportion of nitrified N emitted as N2O changed from 0.13 to 2.32%. In coherence with previous studies, we interpreted this high value as resulting from the decrease in O2 availability through the increase in soil moisture content. It thus appears that, under limiting aeration conditions, some values for N2O emissions through nitrification could be underestimated.
Databáze: OpenAIRE
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