Field data on methane fluxes, temperature, soil gas profiles and microbial activities in ponds of the northeast Siberian polygonal tundra ...

• Main Authors: Knoblauch, Christian, Spott, Oliver, Evgrafova, Svetlana, Kutzbach, Lars, Pfeiffer, Eva-Maria
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2015
• Subjects: carbon dioxide; carbon isotope; dissolved oxygen; Lake/Pond; Soil Organic Carbon SOC; soil temperature; water temperature; Soil profile; permafrost; Tundra; Siberia
• Online Access: https://dx.doi.org/10.1594/pangaea.853641; https://doi.pangaea.de/10.1594/PANGAEA.853641

Methane (CH4) production, oxidation, and emission were studied in ponds of the permafrost-affected polygonal tundra in northeast Siberia. Microbial degradation of organic matter in water-saturated soils is the most important source for the climate-relevant trace gas CH4. Although ponds and lakes cover a substantial fraction of the land surface of northern Siberia, data on CH4 fluxes from these water bodies are scarce. Summer CH4 fluxes were measured with closed chambers at the margins of ponds vegetated by vascular plants and in their centers without vascular plants. Furthermore, CH4 and oxygen concentration gradients, stable carbon isotope signatures of dissolved and emitted CH4, and microbial CH4 production and CH4 oxidation were determined. Mean summer fluxes were significantly higher at the margins of the ponds (46.1 ± 15.4 mg CH4/m**2/d) than at the centers (5.9 ± 8.2 mg CH4/m**2/d). CH4 transport was dominated by diffusion in most open water sites, but substantial ebullitive fluxes (12.0 ± 8.1 mg ... : The data files give the basic field and laboratory data on five ponds in the northeast Siberian Arctic tundra on Samoylov.The files contain water and soil temperature data of the ponds, methane fluxes, measured with closed chambers in the centres without vascular plants and the margins with vascular plants, the contribution of plant mediated fluxes on total methane fluxes, the gas concentrations (methane and dissolved inorganic carbon, oxygen) in the soil and the water column of the ponds, microbial activities (methane production, methane oxidation, aerobic and anaerobic carbon dioxide production), total carbon pools in the different horizons of the bottom soils, soil bulk density, soil substance density, and soil porosity. ...