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Research article - Peer-reviewed, 2022

Resistance of subarctic soil fungal and invertebrate communities to disruption of below-ground carbon supply

Parker, Thomas C.; Chomel, Mathilde; Clemmensen, Karina E.; Friggens, Nina L.; Hartley, Iain P.; Johnson, David; Kater, Ilona; Krab, Eveline J.; Lindahl, Bjorn D.; Street, Lorna E.; Subke, Jens-Arne; Wookey, Philip A.


The supply of recent photosynthate from plants to soils is thought to be a critical mechanism regulating the activity and diversity of soil biota. In the Arctic, large-scale vegetation transitions are underway in response to warming, and there is an urgent need to understand how these changes affect soil biodiversity and function. We investigated how abundance and diversity of soil fungi and invertebrates responded to a reduction in fresh below-ground photosynthate supply in treeline birch and willow, achieved using stem girdling. We hypothesised that birch forest would support greater abundance of ectomycorrhizal (ECM) fungal species and fauna than willow shrubs, and that girdling would result in a rapid switch from ECM fungi to saprotrophs as canopy supply of C was cut, with a concomitant decline in soil fauna. Birch forest had greater fungal and faunal abundance with a large contribution of root-associated ascomycetes (ericoid mycorrhizal fungi and root endophytes) compared to willow shrub plots, which had a higher proportion of saprotrophs and, contrary to our expectations, ECM fungi. Broad-scale soil fungal and faunal functional group composition was not significantly changed by girdling, even in the third year of treatment. Within the ECM community, there were some changes, with genera that are believed to be particularly C-demanding declining in girdled plots. However, it was notable how most ECM fungi remained present after 3 years of isolation of the below-ground compartment from contemporary photosynthate supply. Synthesis. In a treeline/tundra ecosystem, distinct soil communities existed in contrasting vegetation patches within the landscape, but the structure of these communities was resistant to canopy disturbance and concomitant reduction of autotrophic C inputs.


canopy disturbance; fungi; metabarcoding; mycorrhizal fungi; Plant-soil (below-ground) interactions; soil fauna; subarctic

Published in

Journal of Ecology
2022, volume: 110, number: 12, pages: 2883-2897
Publisher: WILEY

Authors' information

Parker, Thomas C.
James Hutton Institute
Chomel, Mathilde
University of Manchester
Friggens, Nina L.
University of Exeter
Hartley, Iain P.
University of Exeter
Johnson, David
University of Manchester
Kater, Ilona
University of Cambridge
Swedish University of Agricultural Sciences, Department of Soil and Environment
Swedish University of Agricultural Sciences, Department of Soil and Environment
Street, Lorna E.
University of Edinburgh
Subke, Jens-Arne
University of Stirling
Wookey, Philip A.
University of Stirling

UKÄ Subject classification

Forest Science
Soil Science

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