Lowering N2O emissions from soils using eucalypt biochar: the importance of redox reactions

Quin P., Joseph Stephen, Husson Olivier, Donne Scott, Mitchell David R.G., Munroe Paul, Phelan D., Cowie A., van Zwieten Lukas. 2015. Lowering N2O emissions from soils using eucalypt biochar: the importance of redox reactions. Scientific Reports, 5 (16773), 14 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
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Abstract : Agricultural soils are the primary anthropogenic source of atmospheric nitrous oxide (N2O), contributing to global warming and depletion of stratospheric ozone. Biochar addition has shown potential to lower soil N2O emission, with the mechanisms remaining unclear. We incubated eucalypt biochar (550 °C) – 0, 1 and 5% (w/w) in Ferralsol at 3 water regimes (12, 39 and 54% WFPS) – in a soil column, following gamma irradiation. After N2O was injected at the base of the soil column, in the 0% biochar control 100% of expected injected N2O was released into headspace, declining to 67% in the 5% amendment. In a 100% biochar column at 6% WFPS, only 16% of the expected N2O was observed. X-ray photoelectron spectroscopy identified changes in surface functional groups suggesting interactions between N2O and the biochar surfaces. We have shown increases in -O-C = N /pyridine pyrrole/NH3, suggesting reactions between N2O and the carbon (C) matrix upon exposure to N2O. With increasing rates of biochar application, higher pH adjusted redox potentials were observed at the lower water contents. Evidence suggests that biochar has taken part in redox reactions reducing N2O to dinitrogen (N2), in addition to adsorption of N2O. (Résumé d'auteur)

Mots-clés Agrovoc : réduction des émissions, Charbon de bois, Eucalyptus, Fertilisation, Sol agricole, Oxyde d'azote, Gaz à effet de serre, Réchauffement global, Biochimie, Spectroscopie aux rayons x, Microscopie électronique, Propriété physicochimique du sol

Mots-clés géographiques Agrovoc : Australie

Mots-clés libres : Biochar, Redox potential, PH, X-ray photoelectron spectroscopy, Green House Gas, XPS analysis, Scanning electron microscopy (SEM), Transmission electron, Microscopy (TEM)

Classification Agris : P02 - Pollution
P33 - Soil chemistry and physics
K50 - Processing of forest products

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Quin P., University of New England (AUS)
  • Joseph Stephen, University of Newcastle (AUS)
  • Husson Olivier, CIRAD-PERSYST-UPR AIDA (BEN) ORCID: 0000-0001-9587-5819
  • Donne Scott, University of Newcastle (AUS)
  • Mitchell David R.G., University of Wollongong (AUS)
  • Munroe Paul, University of NSW (AUS)
  • Phelan D., University of Newcastle (AUS)
  • Cowie A., University of New England (AUS)
  • van Zwieten Lukas, Southern Cross University (AUS)

Source : Cirad-Agritrop (

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