Biochar ageing effects on soil respiration, biochar wettability and gaseous CO2 adsorption

Gerardo Ojeda (), João M. Gil, Stefania Mattana, Jörg Bachmann, Katell Quenea and Abílio J. F. N. Sobral
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Gerardo Ojeda: Escuela de Ciencias Agrícolas, Pecuarias y del Medio Ambiente ECAPMA, Universidad Nacional Abierta y a Distancia UNAD
João M. Gil: University of Coimbra
Stefania Mattana: CREAF
Jörg Bachmann: Institute of Soil Science, Leibniz University of Hannover
Katell Quenea: Sorbonne Universités, UPMC Univ Paris 06
Abílio J. F. N. Sobral: University of Coimbra

Mitigation and Adaptation Strategies for Global Change, 2024, vol. 29, issue 2, No 1, 22 pages

Abstract: Abstract The CO2 emission rates have been continuously incremented during the last decades. To mitigate it, a method to store carbon in terrestrial ecosystems is the addition of biochar to soil. After its application to soil, biochar suffers an ageing process, able to deteriorate its functional properties as soil improver. However, at present, it is not clear how to evaluate biochar ageing. The main aim of this study is to evaluate biochar ageing by determination of temporal changes on (a) soil respiration after biochar addition and (b) the relationship between CO2 adsorption capacity and wettability of biochar as measurable parameters indicating biochar ageing. Results show that 1 month after biochar addition, soil respiration decreased when poplar and pine biochars were applied to bare soils, in the absence of vegetation. One year after biochar addition, this reduction on soil respiration disappeared, evidencing biochar ageing due to decrements on its CO2 adsorption capacity. Compared with fresh biochar, decreased CO2 adsorption capacity of biochar corresponded with enhanced biochar wettability for both biochar types. Its means that poplar and pine biochars, while initially hydrophobic, became hydrophilic after 1 year of its application to soil. It is concluded that changes of biochar CO2 adsorption capacity in time go along with improved wettability as mutually opposed processes. Globally, pine biochar tends to adsorb a higher quantity of CO2 than poplar biochar. The absence of CO2 adsorption of soil without biochar demonstrates the remarkable capacity of both biochars to adsorb carbon dioxide and promote carbon storage in soils.

Keywords: Biochar; CO2 adsorption; Soil respiration; Ageing; Contact angle; Carbon sequestration (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11027-024-10107-7

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