Summary
This broad-scale radiocarbon and mineralogical study across sub-Saharan Africa reveals that soil organic carbon persistence is controlled by the interaction of climate, soil mineralogy, and weathering state. Moderately weathered seasonal soils with reactive clay minerals retain organic carbon longer (topsoil: 201 ± 130 years; subsoil: 645 ± 385 years) than highly weathered humid soils, whilst arid soils show similarly long persistence periods. The findings suggest that pedoclimatic soil groupings may improve predictions of soil carbon dynamics under climate change at regional scales.
UK applicability
This study focuses on sub-Saharan African soils and may have limited direct applicability to UK conditions, which have temperate, less weathered soils with different clay mineralogy and climate regimes. However, the methodological approach of linking soil mineralogy and climate to carbon persistence timescales may inform UK soil carbon modelling and climate change vulnerability assessments.
Key measures
Radiocarbon ages of soil organic carbon (topsoil and subsoil); soil mineral composition; climate classification; weathering status; carbon persistence timescales (years)
Outcomes reported
The study measured radiocarbon ages and mineral properties of soil organic carbon across sub-Saharan Africa to quantify how long carbon persists in different soil types. Results show that organic carbon persistence varies significantly by climate zone and soil mineralogy, with moderately weathered seasonal soils storing carbon longer than highly weathered humid soils.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.