Authors: Christhel Andrade, Ariane Albers, Ezequiel Zamora-Ledezma, Lorie Hamelin
Identifier: CSBE21910
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Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Special Session on Biochar

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Description: Crop residues are an important feedstock for the bioeconomy, accounting for an average potential of 367 Mt DM yr-1 in Europe. The removal of this biomass from arable lands would potentially deplete soil organic carbon (SOC) stocks and affect soil productivity. However, following the carbon flows from bioeconomy processes (e.g. pyrolysis, gasification, and hydrothermal liquefaction) it is found that the more stable carbon fraction (i.e. less prone to degradation in soil) are found in the coproducts (e.g. biochar, hydrochar, digestate). These recalcitrant coproducts can be used as soil amendments to potentially preserve or enhance SOC stocks. This work aimed at determining the maximal amount of crop residue removal rates from field crops of the whole territory of France that are used in the bioeconomy and recycled back the biochar to the soil to maintain or enhance SOC stocks in the long-term. Different biochar scenarios were compared against non-residue removal scenarios over the period 2020-2120 with future climate predictions under the RCP 4.5 scenario. We followed a spatially explicit approach and simulated the SOC stock changes with the AMG soil-carbon model. France was clustered in 62552 simulation units. A literature review (57 papers, 273 observations) determined the stability of biochar produced by each considered process, resulting in a recalcitrance of 95% for gasification and pyrolysis biochar, and 83% for hydrochar. The AMG model was modified to consider the recalcitrant biochar input. The sustainable amount of residue removals and SOC stock results are presented as georeferenced products at 1 km spatial resolution.

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Date: 2021-06-11
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Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: SPECIAL SESSION Biochar 1

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Type: Text.Abstract
Publication type: Presentation
Coverage: France
Language 1: en
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Rights: Canadian Society for Bioengineering
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