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Title: The molar H: Corg ratio of biochar is a key factor in mitigating N2O emissions from soil
Contributor(s): Cayuela, M L (author); Jeffery, S (author); van Zwieten, Lukas  (author)
Publication Date: 2015
DOI: 10.1016/j.agee.2014.12.015
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Abstract: A previously published meta-analysis of biochar impacts on soil N2O emissions by Cayuela et al. (2014) found a "grand mean" reduction in N2O emissions of 54 ± 6% following biochar application to soil. Here we update this analysis to include 26 additional manuscripts bringing the total to 56 articles. The updated meta-analysis confirms that biochar reduces soil N2O emissions by 49 ± 5% (mean ± 95% confidence interval). Importantly, this meta-analysis has sufficient data to investigate the impact of biochar under field conditions, showing a statistically significant lower average reduction in the field (28 ± 16%) compared to controlled laboratory studies (54 ± 3%). A key finding is the importance of the molar H:Corg ratio of biochar in determining mitigation of N2O. Biochars with a molar H:Corg ratio <0.3, indicative of a high degree of aromatic condensation, lowered N2O emissions by 73 ± 7% while biochars with a molar H:Corg ratio >0.5 were less effective at 40 ± 16%. Together with previously published information, our new results suggest that a key mitigation mechanism is linked to the degree of polymerization and aromaticity of biochar.
Publication Type: Journal Article
Source of Publication: Agriculture, Ecosystems & Environment, v.202, p. 135-138
Publisher: Elsevier BV
Place of Publication: Netherlands
ISSN: 0167-8809
Field of Research (FOR): 050301 Carbon Sequestration Science
050304 Soil Chemistry (excl. Carbon Sequestration Science)
Socio-Economic Outcome Codes: 961402 Farmland, Arable Cropland and Permanent Cropland Soils
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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