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Title: Lowering N2O emissions from soils using eucalypt biochar: the importance of redox reactions
Contributor(s): Quin, P R  (author); Joseph, Stephen  (author); Husson, O (author); Donne, S (author); Mitchell, D (author); Munroe, P (author); Phelan, D (author); Cowie, Annette  (author); Van Zwieten, L (author)
Publication Date: 2015
Open Access: Yes
DOI: 10.1038/srep16773Open Access Link
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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.
Publication Type: Journal Article
Source of Publication: Scientific Reports, v.5, p. 1-14
Publisher: Nature Publishing Group
Place of Publication: United Kingdom
ISSN: 2045-2322
Field of Research (FOR): 100712 Nanoscale Characterisation
050304 Soil Chemistry (excl. Carbon Sequestration Science)
059999 Environmental Sciences not elsewhere classified
Socio-Economic Outcome Codes: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
960302 Climate Change Mitigation Strategies
960504 Ecosystem Assessment and Management of Farmland, Arable Cropland and Permanent Cropland Environments
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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