Summary
This study examined how soil organic matter composition influences decomposition rates in drained organic soils across three land-use types in Switzerland. Using 560 samples from 21 sites, the authors quantified CO₂ fluxes under controlled incubation at 10 and 20 °C and found that whilst decomposition increased in the order forest < grassland < cropland, the weak correlations between chemical soil characteristics and CO₂ emissions suggest that soil organic matter composition is an underestimated but incompletely explained factor in determining carbon loss from managed peatlands.
UK applicability
The findings are potentially relevant to UK peatland management, particularly in England and Scotland where extensive drained organic soils are used for agriculture and forestry. However, the study was conducted in Swiss climate and soil conditions; UK practitioners should consider whether findings hold under wetter, cooler conditions typical of British peatlands.
Key measures
CO₂ emission rates (mg CO₂-C g⁻¹ SOC); soil organic carbon content; bulk density; pH; elemental ratios (C/N, H/C, O/C); temperature sensitivity (Q₁₀)
Outcomes reported
The study measured CO₂ emission rates from 560 samples of drained organic soils (cropland, grassland, forest) incubated at two temperatures over 6 months, and related decomposition rates to soil chemical composition. CO₂ release varied substantially (6–195 mg CO₂-C g⁻¹ SOC at 10 °C; 12–423 mg g⁻¹ at 20 °C) despite controlled conditions, suggesting soil organic matter composition influences decomposition rates.
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