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Carbon sequestration and community composition of ectomycorrhizal fungi across a geothermal warming gradient in an Icelandic spruce forest

  • Nicholas Rosenstock
  • Magnus Ellström
  • Edda Oddsdottir
  • Bjarni D. Sigurdsson
  • Håkan Wallander
Publishing year: 2019
Language: English
Pages: 32-42
Publication/Series: Fungal Ecology
Volume: 40
Document type: Journal article
Publisher: Elsevier

Abstract english

Soil warming (0–5.5 °C above controls) effects on ectomycorrhizal growth, carbon sequestration and community composition were examined in a Picea sitchensis forest spanning a geothermal gradient in Iceland. Fungal communities were assayed with sand-filled ingrowth meshbags incubated in the soil for 5 months. Meshbags amended with compost made from maize leaves (a C4 plant enriched in 13C) were incubated for 5 or 12 months and used to estimate C sequestration by the fungal community. Despite increases in tree growth, moderate warming only slightly reduced or had no effect on mycelial growth and had no effect on fungal carbon sequestration or overall ectomycorrhizal community composition. Warming was associated with increased abundance of ascomycetes, particularly pyronemataceous ectomycorrhizal fungi, and altered saprotrophic community composition. Increased nitrate availability and root turnover may explain the lack of a positive ectomycorrhizal growth response to increased tree growth and observed shifts in community composition with warming.


  • Soil Science
  • Carbon sequestration
  • Climate change
  • Ectomycorrhiza
  • Picea sitchensis
  • Pyronemataceae
  • Soil warming
  • Wilcoxina


  • ISSN: 1754-5048
Nicholas Rosenstock

Research group

Microbial Ecology


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Plant and fungi in pot