Cited by 743Soil Carbon and Nitrogen DynamicsWastewater Treatment and Nitrogen RemovalSoil and Water Nutrient Dynamics

Biochar and denitrification in soils: when, how much and why does biochar reduce N2O emissions?

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Cayuela, Maria Luz, Sánchez-Monedero, Miguel Angel, Roig, Asunción, Hanley, Kelly, Enders, Akio, Lehmann, Johannes·2013·Scientific Reports

Abstract

Agricultural soils represent the main source of anthropogenic N2O emissions. Recently, interactions of black carbon with the nitrogen cycle have been recognized and the use of biochar is being investigated as a means to reduce N2O emissions. However, the mechanisms of reduction remain unclear. Here we demonstrate the significant impact of biochar on denitrification, with a consistent decrease in N2O emissions by 10-90% in 14 different agricultural soils. Using the (15)N gas-flux method we observed a consistent reduction of the N2O/(N2 + N2O) ratio, which demonstrates that biochar facilitates the last step of denitrification. Biochar acid buffer capacity was identified as an important aspect for mitigation that was not primarily caused by a pH shift in soil. We propose the function of biochar as an "electron shuttle" that facilitates the transfer of electrons to soil denitrifying microorganisms, which together with its liming effect would promote the reduction of N2O to N2.

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Authors
Cayuela, M. L., Sánchez-Monedero, M. A., Roig, A., Hanley, K., Enders, A., & Lehmann, J.
Affiliations
  • Consejo Superior de Investigaciones Científicas (ES)
  • Cornell University (US)
Venue
Scientific Reports
Published
2013-04-25
Volume
3
Issue
1
Pages
1732-1732
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2110934367
Cited by
743
References
5
Citations by year
2026: 52 · 2025: 58 · 2024: 70 · 2023: 61 · 2022: 51 · 2021: 79 · 2020: 49 · 2019: 69 · 2018: 61 · 2017: 44 · 2016: 56 · 2015: 40 · 2014: 46 · 2013: 7
FWCI
71.96
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by-nc-nd)
Funders
  • National Science Foundation (0965336)
  • U.S. Department of Agriculture (IOS-0965336)
  • European Commission (277069)
  • Fondation des Fondateurs
  • FP7 People: Marie-Curie Actions
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Pollution › Wastewater Treatment and Nitrogen Removal
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
Keywords
biochar, denitrification, nitrous oxide emissions, agricultural soils, black carbon, nitrogen cycling, electron shuttles, liming effect, N2O/N2 ratio, greenhouse gas emissions reduction
MeSH terms
Agriculture, Charcoal, Gases, Nitrogen, Nitrous Oxide, Soil, Denitrification

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