Summary
This meta-analysis of 71 independent studies (1990–June 2023) quantified cover crop effects on three soil organic carbon pools in arable cropland, with emphasis on European-representative climatic zones. Cover crops significantly increased MAOC by 4.8%, POC by 23.2%, and MBC by 20.2% compared to no cover crop cultivation, feeding both stable and labile carbon pools. The analysis identified soil clay content, initial SOC concentration, cover crop biomass, and management practices as key moderators of these effects, whilst highlighting substantial evidence gaps particularly for MAOC and POC research in European north–south gradients.
UK applicability
The findings are directly relevant to United Kingdom temperate arable systems, where cover crops are increasingly promoted for soil health and carbon sequestration. The meta-analysis identifies specific soil and management factors (clay content, tillage depth, rotation duration) that could inform UK uptake strategies, though the authors emphasise the need for additional European field studies to strengthen regional applicability.
Key measures
Percentage change in mineral-associated organic carbon (MAOC), particulate organic carbon (POC), and microbial biomass carbon (MBC); moderating factors including soil clay content, initial SOC concentration, cover crop peak biomass, experiment duration, crop rotation duration, and tillage depth
Outcomes reported
The study quantified the effects of cover crops on three distinct soil organic carbon pools: mineral-associated organic carbon (MAOC), particulate organic carbon (POC), and microbial biomass carbon (MBC) in the top soil layer, compared to no cover crop cultivation. Effect sizes were reported with 95% confidence intervals, and moderating factors influencing these responses were identified.
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