Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil
Abstract 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 ca...
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crcambridgeupr:10.1017/s0954102012000855 2024-04-28T08:01:59+00:00 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. 2012 http://dx.doi.org/10.1017/s0954102012000855 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102012000855 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 25, issue 1, page 55-61 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2012 crcambridgeupr https://doi.org/10.1017/s0954102012000855 2024-04-09T06:55:51Z Abstract 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 Antarctic Science McMurdo Dry Valleys Cambridge University Press Antarctic Science 25 1 55 61 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics 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 |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract 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 (CUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1017/s0954102012000855 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102012000855 |
genre |
Antarc* Antarctic Antarctic Science McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctic Science McMurdo Dry Valleys |
op_source |
Antarctic Science volume 25, issue 1, page 55-61 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
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_ |
1797573492691959808 |