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  Storage and mobility of black carbon in permafrost soils of the forest tundra ecotone in Northern Siberia

Guggenberger, G., Rodionov, A., Shibistova, O., Grabe, M., Kasansky, O. A., Fuchs, H., et al. (2008). Storage and mobility of black carbon in permafrost soils of the forest tundra ecotone in Northern Siberia. Global Change Biology, 14(6), 1367-1381. doi:10.1111/j.1365-2486.2008.01568.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-D67F-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-D680-A
Genre: Journal Article

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Guggenberger, G., Author
Rodionov, A., Author
Shibistova, O., Author
Grabe, M.1, Author              
Kasansky, O. A., Author
Fuchs, H., Author
Mikheyeva, N., Author
Zrazhevskaya, G., Author
Flessa, H., Author
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              

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Free keywords: Active layer Benzene polycarboxylic acid method Black carbon Catchment Forest tundra Permafrost Raised bogs Soil organic carbon Thermokarst Topography Dissolved organic-matter Scots pine forests Boreal forest Isotope geochemistry Pyrogenic carbon Arctic tundra State c-13 Fire Charcoal Ecosystems
 Abstract: Boreal permafrost soils store large amounts of organic carbon (OC). Parts of this carbon (C) might be black carbon (BC) generated during vegetation fires. Rising temperature and permafrost degradation is expected to have different consequences for OC and BC, because BC is considered to be a refractory subfraction of soil organic matter. To get some insight into stocks, variability, and characteristics of BC in permafrost soils, we estimated the benzene polycarboxylic acid (BPCA) method-specific composition and storage of BC, i.e. BPCA-BC, in a 0.44 km(2)-sized catchment at the forest tundra ecotone in northern Siberia. Furthermore, we assessed the BPCA-BC export with the stream draining the catchment. The catchment is composed of various landscape units with south-southwest (SSW) exposed mineral soils characterized by thick active layer or lacking permafrost, north-northeast (NNE) faced mineral soils with thin active layer, and permafrost-affected raised bogs in plateau positions showing in part thermokarst formation. There were indications of vegetation fires at all landscape units. BC was ubiquitous in the catchment soils and BPCA-BC amounted to 0.6-3.0% of OC. This corresponded to a BC storage of 22-3440 g m(-2). The relative contribution of BPCA-BC to OC, as well as the absolute stocks of BPCA-BC were largest in the intact bogs with a shallow active layer followed by mineral soils of the NNE aspects. In both landscape units, a large proportion of BPCA-BC was stored within the permafrost. In contrast, mineral soils with thick active layer or lacking permafrost and organic soils subjected to thermokarst formation stored less BPCA-BC. Permafrost is, hence, not only a crucial factor in the storage of OC but also of BC. In the stream water BPCA-BC amounted on an average to 3.9% of OC, and a yearly export of 0.10 g BPCA-BC m(-2) was calculated, most of it occurring during the period of snow melt with dominance of surface flow. This suggests that BC mobility in dissolved and colloidal phase is an important pathway of BC export from the catchment. Such a transport mechanism may explain the high BC concentrations found in sediments of the Arctic Ocean. [References: 72]

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 Dates: 2008
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1111/j.1365-2486.2008.01568.x
Other: BGC1120
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Title: Global Change Biology
Source Genre: Journal
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Publ. Info: Oxford, UK : Blackwell Science
Pages: - Volume / Issue: 14 (6) Sequence Number: - Start / End Page: 1367 - 1381 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925618107
ISSN: 1354-1013