Summary
This analytical study compared paired natural and drained sites within a Finnish Sphagnum-dominated bog to elucidate how drainage-induced hydrological changes alter peat organic matter chemistry. Principal component analysis of pyrolysis products revealed that drainage effects operate through multiple simultaneous mechanisms: aerobic decomposition (depleting Sphagnum phenols and simple polysaccharides), vegetation shift from Sphagnum to pine (enriching lignin and N-compounds), and altered anaerobic processes. The findings demonstrate that peat organic matter chemistry is a sensitive indicator of decomposition status and that even moderate, short-term hydrological alterations substantially reshape the chemical signature of stored carbon.
UK applicability
The mechanistic insights into drainage-driven organic matter decomposition may inform UK peatland management and restoration strategies, particularly in England and Scotland where peat drainage for agriculture and forestry has been widespread. However, direct application requires consideration of different peat types, vegetation communities, and climatic conditions characteristic of UK blanket and lowland bogs.
Key measures
Pyrolysis-GC/MS-quantified organic matter compounds; elemental ratios (O:C, N:C); stable isotopes (δ13C, δ15N); radiocarbon fraction; vegetation composition; principal component analysis of chemical composition differences
Outcomes reported
The study characterised changes in peat organic matter chemical composition between natural and drained sites using pyrolysis-GC/MS, identifying distinct effects of aerobic decomposition, vegetation shifts, and anaerobic processes on specific compound classes. Drainage-induced shifts from Sphagnum to Pinus sylvestris vegetation were associated with increased lignin, nitrogen compounds, and lipids, whilst decreased phenols and polysaccharides were detected.
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