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<p>Climate change is particularly important in Arctic environments, which are warming faster than the global average. Despite their importance for local biogeochemical cycling and global climate, we have a limited understanding of how warming can affect Arctic soil microbes, and only few studies have examined Arctic soil fungi and bacteria simultaneously or compared the total and active communities. We show the combined effect of simulated summer and winter warming using open-top chambers and snow fences on a tundra soil microbial community in Greenland after one year. The sampling design considers bacteria and fungi, the total (DNA-based) and active (RNA-based) community and changes over the course of a growing season. We observed differences in soil temperature, soil chemical properties and microbial biomass between warming treated sites and controls. Warming significantly affected microbial community composition with a larger effect on fungi compared to bacteria. However, warming only explained 2.6 and 5.7% of the variation in the bacterial and fungal community composition respectively. We observed a 13.30% increase in total fungal saprotrophs in response to warming. Besides the effect of treatment, both bacterial and fungal community composition was affected by the seasonality. Active and total microbial community significantly differed from each other with more pronounced changes for bacteria compared to fungi.</p>

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Short-term warming induces minor changes in an Arctic tundra microbial community

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Jason Bosch,
  • Frances Rose Gilman,
  • Daan Blok,
  • Carsten Suhr Jacobsen,
  • William Holben,
  • Anders Michelsen,
  • Bo Elberling,
  • Anders Priemé,
  • Jana Voříšková

摘要

Climate change is particularly important in Arctic environments, which are warming faster than the global average. Despite their importance for local biogeochemical cycling and global climate, we have a limited understanding of how warming can affect Arctic soil microbes, and only few studies have examined Arctic soil fungi and bacteria simultaneously or compared the total and active communities. We show the combined effect of simulated summer and winter warming using open-top chambers and snow fences on a tundra soil microbial community in Greenland after one year. The sampling design considers bacteria and fungi, the total (DNA-based) and active (RNA-based) community and changes over the course of a growing season. We observed differences in soil temperature, soil chemical properties and microbial biomass between warming treated sites and controls. Warming significantly affected microbial community composition with a larger effect on fungi compared to bacteria. However, warming only explained 2.6 and 5.7% of the variation in the bacterial and fungal community composition respectively. We observed a 13.30% increase in total fungal saprotrophs in response to warming. Besides the effect of treatment, both bacterial and fungal community composition was affected by the seasonality. Active and total microbial community significantly differed from each other with more pronounced changes for bacteria compared to fungi.