You're currently viewing an old version of this dataset. To see the current version, click here.

Soil and incubation data of permafrost-affected soils of the northeast Siberian polygonal tundra

The large amounts of soil organic matter (SOM) in permafrost-affected soils are prone to increased microbial decomposition in a warming climate. The environmental parameters regulating the production of carbon dioxide (CO2) and methane (CH4), however, are insufficiently understood to confidently predict the feedback of thawing permafrost to global warming. Therefore, the effects of oxygen availability, freezing and thawing, temperature, and labile organic matter (OM) additions on greenhouse gas production were studied in northeast Siberian polygonal tundra soils, including the seasonally thawed active layer and upper perennially frozen permafrost. Soils were incubated at constant temperatures of 1 °C, 4 °C, or 8 °C for up to 150 days. CO2 production in surface layers was three times higher than in the deeper soil. Under anaerobic conditions, SOM decomposition was 2-6 times lower than under aerobic conditions and more CO2 than CH4 was produced. CH4 contributed less than 2% to anaerobic decomposition in thawed permafrost but more than 20% in the active layer. A freeze-thaw cycle caused a short-lived pulse of CO2 production directly after re-thawing. Q10 values, calculated via the equal-carbon method, increased with soil depth from 3.4 ± 1.6 in surface layers to 6.1 ± 2.8 in the permafrost. The addition of plant-derived labile OM (13C-labelled Carex aquatilis leaves) resulted in an increase in SOM decomposition only in permafrost (positive priming). The current results indicate that the decomposition of permafrost SOM will be more strongly influenced by rising temperatures and the availability of labile OM than active layer material. The obtained data can be used to inform process-based models to improve simulations of greenhouse gas production potentials from thawing permafrost landscapes.

Data and Resources

This dataset has no data

Cite this as

Walz Josefine (2016). Dataset: Soil and incubation data of permafrost-affected soils of the northeast Siberian polygonal tundra. https://doi.org/10.1594/PANGAEA.864866

DOI retrieved: 2016

Additional Info

Field Value
Imported on January 12, 2023
Last update August 4, 2023
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.864866
Author Walz Josefine
Source Creation 2016
Publication Year 2016
Resource Type application/zip - filename: Walz_2016
Subject Areas
Name: Agriculture

Name: Lithosphere

Related Identifiers
Title: Regulation of soil organic matter decomposition in permafrost-affected Siberian tundra soils - Impact of oxygen availability, freezing and thawing, temperature, and labile organic matter
Identifier: https://doi.org/10.1016/j.soilbio.2017.03.001
Type: DOI
Relation: IsSupplementTo
Year: 2017
Source: Soil Biology and Biochemistry
Authors: Walz Josefine , Knoblauch Christian , Böhme Luise , Pfeiffer Eva-Maria .