Author(s) |
Cayuela, M L
Jeffery, S
van Zwieten, Lukas
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Publication Date |
2015
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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.
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Citation |
Agriculture, Ecosystems & Environment, v.202, p. 135-138
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ISSN |
1873-2305
0167-8809
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Link | |
Publisher |
Elsevier BV
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Title |
The molar H: Corg ratio of biochar is a key factor in mitigating N2O emissions from soil
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Type of document |
Journal Article
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Entity Type |
Publication
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