Dynamic soil columns simulate Arctic redox biogeochemistry and carbon release during changes in water saturation.

ABSTRACT: Thawing Arctic permafrost can induce hydrologic change and alter redox conditions, shifting the balance of soil organic matter (SOM) decomposition. There remains uncertainty about how soil saturation and redox transitions impact dissolved and gas phase carbon fluxes, and efforts to link hydrobiogeochemical processes to ecosystem-scale models are limited. This study evaluates SOM decomposition of Arctic tundra soils using column experiments, water chemistry measurements, microbial community analysis, and a PFLOTRAN reactive transport model. Soil columns from a thermokarst channel (TC) and an upland tundra (UC) were exposed to cycles of saturation and drainage, which controlled carbon emissions. During saturation, an outflow of dissolved organic carbon from the UC soil correlated with elevat

SUBMITTER: Berns-Herrboldt EC 

PROVIDER: S-EPMC11759714 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature