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Production and turnover of ectomycorrhizal extramatrical mycelial biomass and necromass under elevated CO2 and nitrogen fertilization
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-4384-5014
School of Science & Technology, Örebro University, Örebro, Sweden.
Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Agroscope, Zürich, Switzerland.
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2016 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 211, no 3, p. 874-885Article in journal (Refereed) Published
Abstract [en]

Extramatrical mycelia (EMM) of ectomycorrhizal fungi are important in carbon (C) and nitrogen (N) cycling in forests, but poor knowledge about EMM biomass and necromass turnovers makes the quantification of their role problematic. We studied the impacts of elevated CO2 and N fertilization on EMM production and turnover in a Pinus taeda forest. EMM C was determined by the analysis of ergosterol (biomass), chitin (total bio- and necromass) and total organic C (TOC) of sand-filled mycelium in-growth bags. The production and turnover of EMM bio- and necromass and total C were estimated by modelling. N fertilization reduced the standing EMM biomass C to 57% and its production to 51% of the control (from 238 to 122 kg C ha(-1)  yr(-1) ), whereas elevated CO2 had no detectable effects. Biomass turnover was high (˜13 yr(-1) ) and unchanged by the treatments. Necromass turnover was slow and was reduced from 1.5 yr(-1) in the control to 0.65 yr(-1) in the N-fertilized treatment. However, TOC data did not support an N effect on necromass turnover. An estimated EMM production ranging from 2.5 to 6% of net primary production stresses the importance of its inclusion in C models. A slow EMM necromass turnover indicates an importance in building up forest humus.

Place, publisher, year, edition, pages
Hoboken, USA: Wiley-Blackwell Publishing Inc., 2016. Vol. 211, no 3, p. 874-885
Keywords [en]
Duke Forest free-air CO2 enrichment (FACE), ectomycorrhiza, elevated CO2, extramatrical mycelium, fungal biomass, nitrogen (N) fertilization, stable isotopes, turnover
National Category
Forest Science
Identifiers
URN: urn:nbn:se:oru:diva-50102DOI: 10.1111/nph.13961ISI: 000379937200012PubMedID: 27118132Scopus ID: 2-s2.0-84978054093OAI: oai:DiVA.org:oru-50102DiVA, id: diva2:925771
Funder
Swedish Research Council, 60439101Available from: 2016-05-03 Created: 2016-05-03 Last updated: 2017-11-30Bibliographically approved

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Ekblad, AlfEriksson, Ulrika

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