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The electrochemical properties of biochars and how they affect soil redox properties and processes

Joseph Stephen, Husson Olivier, Graber Ellen Ruth, van Zwieten Lukas, Taherymoosavi Sara, Thomas Torsten, Nielsen Shaun, Ye Jun, Pan Genxing, Chia Chee, Munroe Paul, Allen Jessica, Lin Yun, Fan Xiaorong, Donne Scott. 2015. The electrochemical properties of biochars and how they affect soil redox properties and processes. Agronomy (Basel), 5 (3) : pp. 322-340.

Journal article ; Article de synthèse ; Article de revue à facteur d'impact Revue en libre accès total
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Abstract : Biochars are complex heterogeneous materials that consist of mineral phases, amorphous C, graphitic C, and labile organic molecules, many of which can be either electron donors or acceptors when placed in soil. Biochar is a reductant, but its electrical and electrochemical properties are a function of both the temperature of production and the concentration and composition of the various redox active mineral and organic phases present. When biochars are added to soils, they interact with plant roots and root hairs, micro-organisms, soil organic matter, proteins and the nutrient-rich water to form complex organo-mineral-biochar complexes Redox reactions can play an important role in the development of these complexes, and can also result in significant changes in the original C matrix. This paper reviews the redox processes that take place in soil and how they may be affected by the addition of biochar. It reviews the available literature on the redox properties of different biochars. It also reviews how biochar redox properties have been measured and presents new methods and data for determining redox properties of fresh biochars and for biochar/soil systems. (Résumé d'auteur)

Mots-clés Agrovoc : Charbon de bois, Cendre, Conductivité électrique, Propriété physicochimique, Matière organique du sol, Racine, Substance nutritive, séquestration du carbone, Rhizosphère, Cycle du carbone, Acacia saligna, Bois, Fumier, Biomasse, Pyrolyse, Oxydation

Mots-clés libres : Biochar, Redox, Cyclic voltammetry, Pourbaix diagram, Electron shuttling

Classification Agris : K50 - Processing of forest products
P33 - Soil chemistry and physics
F62 - Plant physiology - Growth and development
F61 - Plant physiology - Nutrition

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

Auteurs et affiliations

  • Joseph Stephen, University of Newcastle (AUS)
  • Husson Olivier, CIRAD-PERSYST-UPR AIDA (BEN) ORCID: 0000-0001-9587-5819
  • Graber Ellen Ruth, Institute of Soil, Water and Environmental Sciences (ISR)
  • van Zwieten Lukas, Southern Cross University (AUS)
  • Taherymoosavi Sara, University of NSW (AUS)
  • Thomas Torsten, University of NSW (AUS)
  • Nielsen Shaun, University of NSW (AUS)
  • Ye Jun, University of NSW (AUS)
  • Pan Genxing, Nanjing Agricultural University (CHN)
  • Chia Chee, University of NSW (AUS)
  • Munroe Paul, University of NSW (AUS)
  • Allen Jessica, University of Newcastle (AUS)
  • Lin Yun, University of Newcastle (AUS)
  • Fan Xiaorong, Nanjing Agricultural University (CHN)
  • Donne Scott, University of Newcastle (AUS)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/577607/)

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