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Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil

Publikation: Bidrag til tidsskriftTidsskriftartikel

  • P. G. Dennis
  • A. D. Sparrow
  • E. G. Gregorich
  • P. M. Novis
  • Elberling, Bo
  • L. G. Greenfield
  • D. W. Hopkins
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.
OriginalsprogEngelsk
TidsskriftAntarctic Science
Vol/bind25
Udgave nummer1
Sider (fra-til)55-61
Antal sider7
ISSN0954-1020
DOI
StatusUdgivet - 1 feb. 2013

Bibliografisk note

CENPERM[2013]

    Forskningsområder

  • ester-linked fatty acids, experimentation, Garwood Valley, McMurdo Dry Valleys, micro-organisms, substrate response

ID: 108031970