Summary
Gattinger et al. (2012) conducted a meta-analysis of paired study sites comparing topsoil organic carbon stocks under organic and non-organic farming systems worldwide. The analysis, published in PNAS, found that organically managed soils generally exhibited higher soil organic carbon concentrations and stocks, and potentially higher carbon sequestration rates, than conventionally managed soils. The paper is widely cited in debates on organic farming's role in climate change mitigation through soil carbon sequestration, though it also notes that net climate benefits depend on factors such as off-farm organic input sourcing.
UK applicability
The findings are broadly applicable to UK conditions, where organic arable and mixed farming systems are common and soil carbon sequestration is a recognised priority under agri-environment schemes such as the Sustainable Farming Incentive. UK policymakers and farmers should note, however, that sequestration benefits may be partially offset by nitrous oxide emissions or imported organic inputs, as acknowledged in the paper.
Key measures
Topsoil organic carbon concentration (%); soil organic carbon stocks (Mg C ha⁻¹); carbon sequestration rates (Mg C ha⁻¹ yr⁻¹); depth of topsoil sampled (cm)
Outcomes reported
The study quantified topsoil organic carbon stocks and sequestration rates across organic and non-organic farming systems, comparing soil organic carbon concentrations and stocks between management regimes. It examined whether organic farming confers measurable advantages in carbon accumulation relative to conventional counterparts.
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