Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys
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 mate...
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2009
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:324775 2023-05-15T13:59:08+02:00 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. Greenfield, L.G. 2009-01-01 https://espace.library.uq.edu.au/view/UQ:324775 eng eng Wiley-Blackwell Publishing Ltd. doi:10.1111/j.1462-2920.2008.01830.x issn:1462-2912 issn:1462-2920 Ecology Evolution Behavior and Systematics Microbiology 1105 Dentistry 2404 Microbiology Journal Article 2009 ftunivqespace https://doi.org/10.1111/j.1462-2920.2008.01830.x 2020-11-10T00:11:35Z 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. Article in Journal/Newspaper Antarc* Antarctic The University of Queensland: UQ eSpace Antarctic The Antarctic Environmental Microbiology 11 3 597 608 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Ecology Evolution Behavior and Systematics Microbiology 1105 Dentistry 2404 Microbiology |
spellingShingle |
Ecology Evolution Behavior and Systematics Microbiology 1105 Dentistry 2404 Microbiology 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. Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
topic_facet |
Ecology Evolution Behavior and Systematics Microbiology 1105 Dentistry 2404 Microbiology |
description |
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. |
format |
Article in Journal/Newspaper |
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. |
author_facet |
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. |
author_sort |
Hopkins, D.W. |
title |
Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
title_short |
Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
title_full |
Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
title_fullStr |
Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
title_full_unstemmed |
Isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the Antarctic dry valleys |
title_sort |
isotopic evidence for the provenance and turnover of organic carbon by soil microorganisms in the antarctic dry valleys |
publisher |
Wiley-Blackwell Publishing Ltd. |
publishDate |
2009 |
url |
https://espace.library.uq.edu.au/view/UQ:324775 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
doi:10.1111/j.1462-2920.2008.01830.x issn:1462-2912 issn:1462-2920 |
op_doi |
https://doi.org/10.1111/j.1462-2920.2008.01830.x |
container_title |
Environmental Microbiology |
container_volume |
11 |
container_issue |
3 |
container_start_page |
597 |
op_container_end_page |
608 |
_version_ |
1766267547891531776 |