DBPapers
DOI: 10.5593/SGEM2016/B32/S13.026

ISOTOPIC SIGNATURE OF METHANE EFFLUX FROM SOIL SURFACE OF SIBERIAN ARCTIC AND SUB-ARCTIC ECOSYSTEMS

S .Evgrafova, O. Novikov, D. Alexandrov, G. Guggenberger
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-62-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 2, 199-204 pp

ABSTRACT
We investigated isotopic signature of methane efflux from soil surface of Siberian arctic and sub-arctic ecosystems in sites in Siberia. In the boreal ecosystem of the Tura site (64°15’N, 100°13’E) the δ13C signature of methane (-43‰ for south facing slope and -35‰ from north facing slope) showed low methane production potential of investigated soils. Two years of monitoring of the δ13CCH4 signatures from surface of ice-wedge polygon of Samoylov island (72°22’N, 126°28’E) showed that the δ13C signature were different regarding to temperature and precipitation. The mean of δ13CCH4 emitted from the polygon wall ranged from 72.5±1.9‰ to -47.3±1.5‰. The same for polygon center ranged from -67.1±2.0‰ to -62.4±1.7‰. Almost no difference between δ13CCH4 signature of years observed could mean that conditions for methane production are possibly quite stable. With respect to methane emission both permafrost ecosystems are thus very contrasting.

Keywords: permafrost-affected soils, forest and tundra ecosystems, methane, δ13C signature

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