Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil
The soils of the McMurdo Dry Valleys are exposed to extremely dry and cold conditions. Nevertheless, they contain active biological communities that contribute to the biogeochemical processes. We have used ester-linked fatty acid (ELFA) analysis to investigate the effects of additions of carbon and...
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Language: | English |
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Cambridge University Press
2013
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Online Access: | https://espace.library.uq.edu.au/view/UQ:296706 |
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:296706 2023-05-15T13:49:28+02:00 Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil Dennis, P. G. Sparrow, A. D. Gregorich, E. G. Novis, P. M. Elberling, B. Greenfield, L. G. Hopkins, D. W. 2013-02-01 https://espace.library.uq.edu.au/view/UQ:296706 eng eng Cambridge University Press doi:10.1017/S0954102012000855 issn:0954-1020 issn:1365-2079 NE/D00893X/1 Not set Ester-linked fatty acids Experimentation Garwood Valley McMurdo Dry Valleys Micro-organisms Substrate response 1105 Ecology Evolution Behavior and Systematics 1907 Geology 1910 Oceanography Journal Article 2013 ftunivqespace https://doi.org/10.1017/S0954102012000855 2020-12-14T23:55:02Z The soils of the McMurdo Dry Valleys are exposed to extremely dry and cold conditions. Nevertheless, they contain active biological communities that contribute to the biogeochemical processes. We have used ester-linked fatty acid (ELFA) analysis to investigate the effects of additions of carbon and nitrogen in glucose and ammonium chloride, respectively, on the soil microbial community in a field experiment lasting three years in the Garwood Valley. In the control treatment, the total ELFA concentration was small by comparison with temperate soils, but very large when expressed relative to the soil organic carbon concentration, indicating efficient conversion of soil organic carbon into microbial biomass and rapid turnover of soil organic carbon. The ELFA concentrations increased significantly in response to carbon additions, indicating that carbon supply was the main constraint to microbial activity. The large ELFA concentrations relative to soil organic carbon and the increases in ELFA response to organic carbon addition are both interpreted as evidence for the soil microbial community containing organisms with efficient scavenging mechanisms for carbon. The diversity of the ELFA profiles declined in response to organic carbon addition, suggesting the responses were driven by a portion of the community increasing in dominance whilst others declined. Article in Journal/Newspaper Antarc* Antarctic McMurdo Dry Valleys The University of Queensland: UQ eSpace Antarctic Garwood ENVELOPE(164.283,164.283,-78.033,-78.033) Garwood Valley ENVELOPE(164.167,164.167,-78.033,-78.033) McMurdo Dry Valleys Antarctic Science 25 1 55 61 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Ester-linked fatty acids Experimentation Garwood Valley McMurdo Dry Valleys Micro-organisms Substrate response 1105 Ecology Evolution Behavior and Systematics 1907 Geology 1910 Oceanography |
spellingShingle |
Ester-linked fatty acids Experimentation Garwood Valley McMurdo Dry Valleys Micro-organisms Substrate response 1105 Ecology Evolution Behavior and Systematics 1907 Geology 1910 Oceanography Dennis, P. G. Sparrow, A. D. Gregorich, E. G. Novis, P. M. Elberling, B. Greenfield, L. G. Hopkins, D. W. Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
topic_facet |
Ester-linked fatty acids Experimentation Garwood Valley McMurdo Dry Valleys Micro-organisms Substrate response 1105 Ecology Evolution Behavior and Systematics 1907 Geology 1910 Oceanography |
description |
The soils of the McMurdo Dry Valleys are exposed to extremely dry and cold conditions. Nevertheless, they contain active biological communities that contribute to the biogeochemical processes. We have used ester-linked fatty acid (ELFA) analysis to investigate the effects of additions of carbon and nitrogen in glucose and ammonium chloride, respectively, on the soil microbial community in a field experiment lasting three years in the Garwood Valley. In the control treatment, the total ELFA concentration was small by comparison with temperate soils, but very large when expressed relative to the soil organic carbon concentration, indicating efficient conversion of soil organic carbon into microbial biomass and rapid turnover of soil organic carbon. The ELFA concentrations increased significantly in response to carbon additions, indicating that carbon supply was the main constraint to microbial activity. The large ELFA concentrations relative to soil organic carbon and the increases in ELFA response to organic carbon addition are both interpreted as evidence for the soil microbial community containing organisms with efficient scavenging mechanisms for carbon. The diversity of the ELFA profiles declined in response to organic carbon addition, suggesting the responses were driven by a portion of the community increasing in dominance whilst others declined. |
format |
Article in Journal/Newspaper |
author |
Dennis, P. G. Sparrow, A. D. Gregorich, E. G. Novis, P. M. Elberling, B. Greenfield, L. G. Hopkins, D. W. |
author_facet |
Dennis, P. G. Sparrow, A. D. Gregorich, E. G. Novis, P. M. Elberling, B. Greenfield, L. G. Hopkins, D. W. |
author_sort |
Dennis, P. G. |
title |
Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
title_short |
Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
title_full |
Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
title_fullStr |
Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
title_full_unstemmed |
Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil |
title_sort |
microbial responses to carbon and nitrogen supplementation in an antarctic dry valley soil |
publisher |
Cambridge University Press |
publishDate |
2013 |
url |
https://espace.library.uq.edu.au/view/UQ:296706 |
long_lat |
ENVELOPE(164.283,164.283,-78.033,-78.033) ENVELOPE(164.167,164.167,-78.033,-78.033) |
geographic |
Antarctic Garwood Garwood Valley McMurdo Dry Valleys |
geographic_facet |
Antarctic Garwood Garwood Valley McMurdo Dry Valleys |
genre |
Antarc* Antarctic McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic McMurdo Dry Valleys |
op_relation |
doi:10.1017/S0954102012000855 issn:0954-1020 issn:1365-2079 NE/D00893X/1 Not set |
op_doi |
https://doi.org/10.1017/S0954102012000855 |
container_title |
Antarctic Science |
container_volume |
25 |
container_issue |
1 |
container_start_page |
55 |
op_container_end_page |
61 |
_version_ |
1766251415060086784 |