Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil
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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.
I: Antarctic Science, Bind 25, Nr. 1, 01.02.2013, s. 55-61.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil
AU - Dennis, P. G.
AU - Sparrow, A. D.
AU - Gregorich, E. G.
AU - Novis, P. M.
AU - Elberling, B.
AU - Greenfield, L. G.
AU - Hopkins, D. W.
N1 - CENPERM[2013]
PY - 2013/2/1
Y1 - 2013/2/1
N2 - 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.
AB - 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.
KW - ester-linked fatty acids
KW - experimentation
KW - Garwood Valley
KW - McMurdo Dry Valleys
KW - micro-organisms
KW - substrate response
U2 - 10.1017/S0954102012000855
DO - 10.1017/S0954102012000855
M3 - Journal article
VL - 25
SP - 55
EP - 61
JO - Antarctic Science
JF - Antarctic Science
SN - 0954-1020
IS - 1
ER -
ID: 108031970