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

Högberg, Mona NSveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management (författare)

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 (15N-, 13C-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. © 2021 The Authors. New Phytologist © 2021 New Phytologist Foundation

NATURVETENSKAP Biologi Mikrobiologi hsv//swe
NATURAL SCIENCES Biological Sciences Microbiology hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Skogsvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Forest Science hsv//eng
NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
Betsele N supply gradient
boreal forest
carbon limitation
ectomycorrhizal fungi
extramatrical ectomycorrhizal mycelium
natural abundance of13C and15N
nitrogen limitation
stable isotope mixing model analysis
Betsele N supply gradient
boreal forest
carbon limitation
ectomycorrhizal fungi
extramatrical ectomycorrhizal mycelium
natural abundance of C and N
nitrogen limitation
stable isotope mixing model analysis

Högberg, PeterSveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)49171 (författare)
Wallander, HåkanLund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Mikrobiologisk ekologi,Forskargrupper vid Lunds universitet,Department of Biology,Faculty of Science,Centre for Environmental and Climate Science (CEC),Microbial Ecology,Lund University Research Groups(Swepub:lu)mbek-hwa (författare)
Nilsson, Lars Ola,1959-Halmstad University,Högskolan i Halmstad,University of Copenhagen, Frederiksberg C, Denmark(Swepub:lu)mbek-lon (författare)
Swedish University of Agricultural SciencesInstitutionen för skogens ekologi och skötsel (creator_code:org_t)
Sveriges lantbruksuniversitet

Ingår i:New PhytologistChichester : Wiley-Blackwell232:4, s. 1839-18480028-646X1469-8137

Av författaren/redakt...: Högberg, Mona N; Högberg, Peter; Wallander, Håkan; Nilsson, Lars Ol ...

Om ämnet

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Skogsvetenskap

Av lärosätet: Högskolan i Halmstad; Lunds universitet; Sveriges Lantbruksuniversitet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.