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Carbon-nitrogen relations of ectomycorrhizal mycelium across a natural nitrogen supply gradient in boreal forest

N. Högberg, Mona and Högberg, Peter and Wallander, Hakan and Nilsson, Lars-Ola (2021). Carbon-nitrogen relations of ectomycorrhizal mycelium across a natural nitrogen supply gradient in boreal forest. New Phytologist. 232 , 1839-1848
[Research article]

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Abstract

The supply of carbon (C) from tree photosynthesis to ectomycorrhizal (ECM) fungi is known to decrease with increasing plant nitrogen (N) supply, but how this affects fungal nutrition and growth remains to be clarified. We placed mesh-bags with quartz sand, with or without an organic N (N-15-, C-13-labeled) source, in the soil along a natural N supply gradient in boreal forest, to measure growth and use of N and C by ECM extramatrical mycelia. Mycelial C : N declined with increasing N supply. Addition of N increased mycelial growth at the low-N end of the gradient. We found an inverse relationship between uptake of added N and C; the use of added N was high when ambient N was low, whereas use of added C was high when C from photosynthesis was low. We propose that growth of ECM fungi is N-limited when soil N is scarce and tree belowground C allocation to ECM fungi is high, but is C-limited when N supply is high and tree belowground C allocation is low. This suggests that ECM fungi have a major role in soil N retention in nutrient-poor, but less so in nutrient-rich boreal forests.

Authors/Creators:N. Högberg, Mona and Högberg, Peter and Wallander, Hakan and Nilsson, Lars-Ola
Title:Carbon-nitrogen relations of ectomycorrhizal mycelium across a natural nitrogen supply gradient in boreal forest
Series Name/Journal:New Phytologist
Year of publishing :2021
Volume:232
Page range:1839-1848
Number of Pages:10
Publisher:WILEY
ISSN:0028-646X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Betsele N supply gradient, boreal forest, carbon limitation, ectomycorrhizal fungi, extramatrical ectomycorrhizal mycelium, natural abundance of C-13 and N-15, nitrogen limitation, stable isotope mixing model analysis
URN:NBN:urn:nbn:se:slu:epsilon-p-113688
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113688
Additional ID:
Type of IDID
DOI10.1111/nph.17701
Web of Science (WoS)000695239600001
ID Code:25991
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:29 Oct 2021 13:25
Metadata Last Modified:29 Oct 2021 13:31

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