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  • Hasselquist, NilesSwedish University of Agricultural Sciences, Umeå,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management (författare)

Greater carbon allocation to mycorrhizal fungi reduces tree nitrogen uptake in a boreal forest

  • Artikel/kapitelEngelska2016

Förlag, utgivningsår, omfång ...

  • 2015-12-03
  • Wiley,2016
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:umu-120100
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-120100URI
  • https://doi.org/10.1890/15-1222.1DOI
  • https://res.slu.se/id/publ/76065URI
  • https://lup.lub.lu.se/record/45f897ab-e5bb-4788-bd2a-21b7593b04eaURI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • The central role that ectomycorrhizal (EM) symbioses play in the structure and function of boreal forests pivots around the common assumption that carbon (C) and nitrogen (N) are exchanged at rates favorable for plant growth. However, this may not always be the case. It has been hypothesized that the benefits mycorrhizal fungi convey to their host plants strongly depends upon the availability of C and N, both of which are rapidly changing as a result of intensified human land use and climate change. Using large-scale shading and N addition treatments, we assessed the independent and interactive effects of changes in C and N supply on the transfer of N in intact EM associations with similar to 15 yr. old Scots pine trees. To assess the dynamics of N transfer in EM symbioses, we added trace amounts of highly enriched (NO3-)-N-15 label to the EM-dominated mor-layer and followed the fate of the N-15 label in tree foliage, fungal chitin on EM root tips, and EM sporocarps. Despite no change in leaf biomass, shading resulted in reduced tree C uptake, ca. 40% lower fungal biomass on EM root tips, and greater N-15 label in tree foliage compared to unshaded control plots, where more N-15 label was found in fungal biomass on EM colonized root tips. Short-term addition of N shifted the incorporation of N-15 label from EM fungi to tree foliage, despite no significant changes in below-ground tree C allocation to EM fungi. Contrary to the common assumption that C and N are exchanged at rates favorable for plant growth, our results show for the first time that under N-limited conditions greater C allocation to EM fungi in the field results in reduced, not increased, N transfer to host trees. Moreover, given the ubiquitous nature of mycorrhizal symbioses, our results stress the need to incorporate mycorrhizal dynamics into process-based ecosystem models to better predict forest C and N cycles in light of global climate change.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Metcalfe, DanielSwedish University of Agricultural Sciences, Umeå,Lund University,Lunds universitet,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)nate-dma (författare)
  • Inselsbacher, ErichSwedish University of Agricultural Sciences, Umeå,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Vienna(Swepub:slu)47110 (författare)
  • Stangl, ZsofiaSwedish University of Agricultural Sciences, Umeå,Umeå universitet,Umeå Plant Science Centre (UPSC),Institutionen för fysiologisk botanik(Swepub:umu)zsri0001 (författare)
  • Oren, RamSwedish University of Agricultural Sciences, Umeå,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Duke University(Swepub:slu)49105 (författare)
  • Näsholm, TorgnySwedish University of Agricultural Sciences, Umeå,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Umeå Plant Science Centre (UPSC),Institutionen för fysiologisk botanik,Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden,Institutionen för skogens ekologi och skötsel,Umeå University(Swepub:slu)48242 (författare)
  • Högberg, PeterUmeå University,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)49171 (författare)
  • Sveriges lantbruksuniversitetInstitutionen för skogens ekologi och skötsel (creator_code:org_t)
  • Sveriges lantbruksuniversitet

Sammanhörande titlar

  • Ingår i:Ecology: Wiley97:4, s. 1012-10220012-96581939-9170

Internetlänk

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  • Ecology (Sök värdpublikationen i LIBRIS)

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