Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys

Hopkins, D.W., Sparrow, A.D., Gregorich, E.G., Elberling, B., Novis, P., Fraser, F., Scrimgeour, C., Dennis, P.G., Meier-Augenstein, W. and Greenfield, L.G. (2009) Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys. Environmental Microbiology, 11 3: 597-608. doi:10.1111/j.1462-2920.2008.01830.x


Author Hopkins, D.W.
Sparrow, A.D.
Gregorich, E.G.
Elberling, B.
Novis, P.
Fraser, F.
Scrimgeour, C.
Dennis, P.G.
Meier-Augenstein, W.
Greenfield, L.G.
Title Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys
Journal name Environmental Microbiology   Check publisher's open access policy
ISSN 1462-2912
1462-2920
Publication date 2009-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1111/j.1462-2920.2008.01830.x
Open Access Status Not Open Access
Volume 11
Issue 3
Start page 597
End page 608
Total pages 12
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
Language eng
Subject 1105 Dentistry
2404 Microbiology
Abstract Summary: The extremely cold and arid Antarctic dry valleys are one of the most environmentally harsh terrestrial ecosystems supporting organisms in which the biogeochemical transformations of carbon are exclusively driven by microorganisms. The natural abundance of 13C and 15N in source organic materials and soils have been examined to obtain evidence for the provenance of the soil organic matter and the C loss as CO2 during extended incubation (approximately 1200 days at 10°C under moist conditions) has been used to determine the potential decay of soil organic C. The organic matter in soils remote from sources of liquid water or where lacustrine productivity was low had isotope signatures characteristic of endolithic (lichen) sources, whereas at more sheltered and productive sites, the organic matter in the soils that was a mixture mainly lacustrine detritus and moss-derived organic matter. Soil organic C declined by up to 42% during extended incubation under laboratory conditions (equivalent to 50-73 years in the field on a thermal time basis), indicating relatively fast turnover, consistent with previous studies indicating mean residence times for soil organic C in dry valley soils in the range 52-123 years and also with recent inputs of relatively labile source materials.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Wed, 05 Mar 2014, 01:53:16 EST by Paul Dennis on behalf of School of Agriculture and Food Sciences