Summary
This field study in the Belgian Dijle valley quantified how floodplain hydrology regulates greenhouse gas emissions and soil carbon dynamics across contrasting water regimes and land uses. By combining in situ GHG flux measurements with soil carbon quality characterisation, the authors demonstrate that maintaining water tables at shallow but aerobic depths could reduce both soil CO2 emissions and their temperature sensitivity, offering a potentially valuable climate regulation strategy for floodplain restoration.
UK applicability
Findings are directly applicable to UK lowland floodplain management, particularly in regions with similar loess soils and modified hydrology. The rewetting strategy for reducing GHG emissions aligns with UK environmental policy priorities for wetland restoration and climate mitigation, though regional hydrological and soil differences should be considered in implementation.
Key measures
Soil CO2 and CH4 fluxes; temperature sensitivity (Q10); soil organic carbon, nitrogen, and C/N ratio; thermal properties (Energy Density, T50) from differential scanning calorimetry; C-specific basal respiration (R10)
Outcomes reported
The study measured soil CO2 and CH4 fluxes across three hydrological zones during the wettest year on record, and characterised soil carbon quality using thermal and elemental analyses. It quantified how water table position and soil moisture influence temperature sensitivity of respiration and the relative contribution of methane to total greenhouse gas emissions.
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