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Carbon–nitrogen relations of ectomycorrhizal mycelium across a natural nitrogen supply gradient in boreal forest
Author(s) -
Högberg Mo.,
Högberg Peter,
Wallander Håkan,
Nilsson LarsOla
Publication year - 2021
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.17701
Subject(s) - mycelium , taiga , ectomycorrhiza , nutrient , nitrogen , photosynthesis , boreal , botany , nitrogen cycle , agronomy , biology , environmental science , ecology , chemistry , symbiosis , mycorrhiza , genetics , organic chemistry , bacteria
Summary 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 ( 15 N‐, 13 C‐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.