Evaluating the two-pool decay model for biochar carbon permanence

• DOI: 10.1007/s42773-024-00408-0
• Publication Date: 2025-01-08T03:17:03Z
• Authors: Hamed Sanei; Henrik Ingermann ...; David Chiaramonti; Ondrej Masek
• Keywords: Carbon fibers; Charcoal

Abstract Accurate estimation of biochar carbon permanence is essential for assessing its effectiveness as a dioxide removal (CDR) strategy. The widely adopted framework, based on the two-pool exponential decay model, forms basis policy guidelines and national CDR accounting. However, our re-analysis meta-data used in this model reveals significant deficiencies parameterization, leading to two critical issues. First, current parameterization assigns disproportionally low percentage labile fraction (C1) relative recalcitrant (C2), effectively reducing single-pool approach. Due limited duration incubation experiments, constant incorrectly applied entire mass, resulting considerable overestimation rate. Second, analysis lack causal correlation between assigned proportions C1 C2 key carbonization parameters such production temperature hydrogen-to-carbon (H/C) ratios, suggesting that does not accurately represent underlying chemistry. This misalignment contradicts established relationship increased stability higher degree carbonization. Consequently, may adequately reflect sequestration potential biochar. While multi-pool suitable predicting biochar, primary issue with lies rather than structure. To address these limitations, we recommend future research prioritize development revised improved supported by empirical decomposition data from variety experimental methods, including studies, accelerated aging comprehensive physicochemical characterization. refined approach will improve accuracy estimations, strengthening role global management strategies.