Soil organic carbon response to global environmental change depends on its distribution between mineral-associated and particulate organic matter: A meta-analysis.

Summary

This meta-analysis demonstrates that soil organic carbon fractions respond distinctly to global environmental changes, with particulate organic carbon (POC) showing greater short-term responsiveness than bulk SOC or mineral-associated organic carbon (MAOC). Nitrogen fertilization increased all SOC pools (SOC +5.64%, MAOC +4.49%, POC +13.17%), whilst elevated CO₂ and warming effects were only evident in POC fractions (+5.11% and -10.05%, respectively). The authors argue that mechanistic understanding of SOC dynamics requires separate analysis of MAOC and POC, as these pools are formed and lost through different pathways and respond to environmental drivers with different magnitudes and timescales.

Regional applicability

The global synthesis encompasses studies from diverse agroecological zones but does not specifically disaggregate United Kingdom findings. UK-specific application would require examination of how the meta-analytic patterns—particularly nitrogen fertilization effects and warming responses—manifest in temperate grassland and arable systems typical of British agriculture; UK researchers conducting long-term soil monitoring should consider routine POC fractionation for improved detection of short-term carbon changes.

Key measures

Percentage change in SOC, MAOC, and POC in response to nitrogen fertilization, elevated CO₂, warming, and increased precipitation; effect size variation by soil depth and experiment duration

Outcomes reported

The meta-analysis examined soil organic carbon (SOC) responses to global changes (nitrogen fertilization, elevated CO₂, warming, precipitation) by separately analysing mineral-associated organic carbon (MAOC) and particulate organic carbon (POC) fractions. The study synthesised effect sizes across multiple studies to identify how different SOC pools respond differentially to environmental drivers.

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