Summary
This meta-analysis synthesises published data on biochar carbon sequestration to develop a unified metric combining biochar quality (assessed via H/C_org ratio) and pyrolysis yield. The authors find that stable biochar achieves 25–50% sequestration efficiency of feedstock carbon, with optimal performance at pyrolysis temperatures of 500–550°C (H/C_org 0.38–0.44), yielding an average sequestration efficiency of 41.4% over 100 years for plant-based feedstocks. The work addresses a significant gap in assessing the mitigation potential of biochar as a climate strategy in large-scale agricultural applications.
UK applicability
The findings are directly applicable to UK agricultural policy and practice, particularly regarding implementation of the EU regulation 2021/2088 on biochar quality criteria. The identified optimal pyrolysis conditions and efficiency metrics provide practical guidance for UK biochar producers and farmers considering soil carbon sequestration as part of climate and soil health initiatives.
Key measures
Biochar carbon sequestration efficiency (F_perm); hydrogen-to-organic carbon ratio (H/C_org); carbon yield from pyrolysis; pyrolysis temperature; fraction of feedstock carbon sequestered after 100 years
Outcomes reported
The study evaluated biochar carbon sequestration efficiency by combining biochar quality metrics (hydrogen-to-organic carbon ratio) with pyrolysis yield, calculating the fraction of biochar carbon remaining in soil after 100 years across different feedstock types and pyrolysis temperatures. It identified optimal production conditions and sequestration efficiency ranges for stable biochar used in agricultural soils.
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