Shift in tree species changes the belowground biota of boreal forests

Sunil Mundra, Håvard Kauserud, Tonje Økland, Jørn Frode Nordbakken, Yngvild Ransedokken, O. Janne Kjønaas

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The replacement of native birch with Norway spruce has been initiated in Norway to increase long-term carbon storage in forests. However, there is limited knowledge on the impacts that aboveground changes will have on the belowground microbiota. We examined which effects a tree species shift from birch to spruce stands has on belowground microbial communities, soil fungal biomass and relationships with vegetation biomass and soil organic carbon (SOC). Replacement of birch with spruce negatively influenced soil bacterial and fungal richness and strongly altered microbial community composition in the forest floor layer, most strikingly for fungi. Tree species-mediated variation in soil properties was a major factor explaining variation in bacterial communities. For fungi, both soil chemistry and understorey vegetation were important community structuring factors, particularly for ectomycorrhizal fungi. The relative abundance of ectomycorrhizal fungi and the ectomycorrhizal : saprotrophic fungal ratio were higher in spruce compared to birch stands, particularly in the deeper mineral soil layers, and vice versa for saprotrophs. The positive relationship between ergosterol (fungal biomass) and SOC stock in the forest floor layer suggests higher carbon sequestration potential in spruce forest soil, alternatively, that the larger carbon stock leads to an increase in soil fungal biomass.

Original languageEnglish
Pages (from-to)2073-2087
Number of pages15
JournalNew Phytologist
Issue number6
Publication statusPublished - Jun 2022


  • Norway spruce (Picea abies)
  • boreal forest
  • carbon and nitrogen stock
  • downy birch (Betula pubescens)
  • ectomycorrhiza
  • fungal guild
  • tree species effects

ASJC Scopus subject areas

  • Physiology
  • Plant Science


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