Summary
This 2020 study examines the mechanisms by which pyrogenic organic matter (charred carbon residues) persists in intensively cultivated cropland soils. The research demonstrates that associations between organic and mineral soil components play a central role in stabilising this material over multiple decades to centuries, as opposed to the material's inherent chemical resistance to decomposition. The findings suggest organo-mineral binding is more important than recalcitrance alone in explaining the longevity of biochar-like materials in worked soils, with implications for understanding soil carbon dynamics and the potential of pyrogenic amendments in sustained carbon sequestration under intensive agriculture.
UK applicability
The findings are directly applicable to UK arable farming, particularly in regions with long histories of intensive cereal cultivation where pyrogenic organic matter may have accumulated. Understanding these stabilisation mechanisms could inform soil amendment strategies and carbon sequestration practices in UK cropland management.
Key measures
Pyrogenic organic matter persistence; organo-mineral association strength; soil carbon fractionation; chemical composition of stabilised carbon pools
Outcomes reported
The study investigated the mechanisms by which pyrogenic organic matter (charred carbon) persists in long-cultivated cropland soils over decades to centuries. The research quantified the contribution of organo-mineral associations versus inherent chemical recalcitrance to the stabilisation of this material.
Topic tags
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