Summary
This multi-site field study across Nordic and Central European peatlands demonstrates that stable nitrogen isotope depth profiles, validated against microbial fatty acid composition, can serve as cost-effective indicators of peatland degradation and restoration success. The research reveals a characteristic δ15N turning point in drained peat horizons where fungal-dominated decomposition transitions to bacterial-dominated metabolism as oxygen becomes limiting. These biogeochemical markers offer promise for monitoring peatland ecosystem status in response to land management and climate pressures.
UK applicability
Findings are directly applicable to UK peatland management and restoration, particularly in Scotland, Wales, and Northern England where extensive degraded peatlands require monitoring. The stable isotope approach could complement existing UK peatland restoration programmes, though UK-specific validation studies would strengthen the methodology's local applicability.
Key measures
Nitrogen stable isotope values (δ15N) in soil depth profiles; fatty acid biomarkers (fungal-derived C18:2ω9c; bacterial-derived C14:0, i-C15:0, a-C15:0, C16:1ω9c)
Outcomes reported
The study measured δ15N depth profiles and fatty acid composition across natural, drained, and rewetted peatland sites to identify microbial community shifts associated with peatland degradation and restoration. Findings indicated a distinct δ15N turning point in drained horizons where fungal-dominated metabolism transitions to bacterial-dominated metabolism under oxygen limitation.
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