Seasonal Fluctuations in Iron Cycling in Thawing Permafrost Peatlands.

ABSTRACT: In permafrost peatlands, up to 20% of total organic carbon (OC) is bound to reactive iron (Fe) minerals in the active layer overlying intact permafrost, potentially protecting OC from microbial degradation and transformation into greenhouse gases (GHG) such as CO₂ and CH₄. During the summer, shifts in runoff and soil moisture influence redox conditions and therefore the balance of Fe oxidation and reduction. Whether reactive iron minerals could act as a stable sink for carbon or whether they are continuously dissolved and reprecipitated during redox shifts remains unknown. We deployed bags of synthetic ferrihydrite (FH)-coated sand in the active layer along a permafrost thaw gradient in Stordalen mire (Abisko, Sweden) over the summer (June to September) to capture cha

SUBMITTER: Patzner MS 

PROVIDER: S-EPMC9097474 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature