The molar H: Corg ratio of biochar is a key factor in mitigating N2O emissions from soil

M.L. Cayuela, S.L. Jeffery, L. van Zwieten

Research output: Contribution to journalArticleAcademicpeer-review

108 Citations (Scopus)

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 0.5 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.
Original languageEnglish
Pages (from-to)135-138
JournalAgriculture, Ecosystems and Environment
Volume202
DOIs
Publication statusPublished - 2015

Keywords

  • greenhouse-gas emissions
  • rice
  • impact
  • straw
  • co2
  • carbon
  • china
  • paddy
  • plant
  • denitrification

Fingerprint

Dive into the research topics of 'The molar H: Corg ratio of biochar is a key factor in mitigating N2O emissions from soil'. Together they form a unique fingerprint.

Cite this