The isotopic composition of soil organic carbon on a north - south transect in western Canada.

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077379%3A_____%2F02%3A61033073" target="_blank" >RIV/60077379:_____/02:61033073 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
The isotopic composition of soil organic carbon on a north - south transect in western Canada.
Original language description
The minor isotopes of carbon (13C and 14C) are widely used as tracers in studies of the global carbon cycle. We present carbon-isotope data for the 0-5 cm layer of soil on a transect from 49,6 degN to 68 degN, from mature forest and tundra ecosystems inthe boreal-arctic zone of interior western Canada. Soil organic carbon in the <2000 microm fraction of the soil decreases from 3,14 kg.m-2 in the south to 1,31 kg.m-2 in the north. The 14C activity of the organic carbon decreases as latitude increases from 118,9 to 100,7 per cent modern carbon (pMC). In addition, the 14C activities of organic carbon in the particle-size fractions of each sample decrease as particle size decreases. These results suggest that organic carbon in the 0-5 cm layer of these soils transfers from standing biomass into the coarsest size fractions of the soil and is then degraded over time, with the residue progressively transferred into the more resistant finer particle sizes. We calculate residence times for the
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EH - Ecology - communities
OECD FORD branch
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Publication year
2002
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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