Summary
This study investigated how soil organic matter (SOM) composition influences decomposition rates in drained peat soils under different land uses in Switzerland. Using laboratory incubation of 560 samples at two temperatures, the authors found that whilst decomposition increased in the order forest < grassland < cropland, chemical SOM characteristics showed weak correlations with CO₂ emissions, suggesting that labile crop residue inputs and land management may be more influential factors than intrinsic SOM composition in determining decomposition rates.
UK applicability
The findings are potentially relevant to UK peatland management and restoration, particularly regarding the carbon implications of drainage and land-use conversion on organic soils. However, direct applicability may be limited by differences in UK peat types, hydrological regimes, and climate compared to Swiss conditions; UK-specific studies would strengthen evidence for domestic policy on peatland agriculture and carbon sequestration.
Key measures
CO₂ emission rates (mg CO₂-C g⁻¹ soil organic carbon); soil organic matter composition; bulk density; pH; soil organic carbon content; elemental ratios (C/N, H/C, O/C); temperature sensitivity (Q₁₀)
Outcomes reported
The study measured CO₂ emission rates from 560 samples of organic soils across 21 sites under different land uses (cropland, grassland, forest) using 6-month laboratory incubation experiments at two temperatures. Results showed wide variation in CO₂ release (6–195 mg CO₂-C g⁻¹ SOC at 10 °C; 12–423 mg g⁻¹ at 20 °C) and consistent temperature sensitivity across land uses (average Q₁₀ of 2.57).
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