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Fungi benefit from two decades of increased nutrient availability in tundra heath soil.

Author:
  • Riikka Rinnan
  • Anders Michelsen
  • Erland Bååth
Publishing year: 2013
Language: English
Publication/Series: PLoS ONE
Volume: 8
Issue: 2
Document type: Journal article
Publisher: Public Library of Science

Abstract english

If microbial degradation of carbon substrates in arctic soil is stimulated by climatic warming, this would be a significant positive feedback on global change. With data from a climate change experiment in Northern Sweden we show that warming and enhanced soil nutrient availability, which is a predicted long-term consequence of climatic warming and mimicked by fertilization, both increase soil microbial biomass. However, while fertilization increased the relative abundance of fungi, warming caused only a minimal shift in the microbial community composition based on the phospholipid fatty acid (PLFA) and neutral lipid fatty acid (NLFA) profiles. The function of the microbial community was also differently affected, as indicated by stable isotope probing of PLFA and NLFA. We demonstrate that two decades of fertilization have favored fungi relative to bacteria, and increased the turnover of complex organic compounds such as vanillin, while warming has had no such effects. Furthermore, the NLFA-to-PLFA ratio for (13)C-incorporation from acetate increased in warmed plots but not in fertilized ones. Thus, fertilization cannot be used as a proxy for effects on warming in arctic tundra soils. Furthermore, the different functional responses suggest that the biomass increase found in both fertilized and warmed plots was mediated via different mechanisms.

Keywords

  • Biological Sciences

Other

Published
  • Effect of environmental factors on fungal and bacterial growth in soil
  • BECC
  • Microbial Ecology
  • ISSN: 1932-6203
Erland Bååth
E-mail: erland [dot] baath [at] biol [dot] lu [dot] se

Professor emeritus

MEMEG

+46 46 222 42 64

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