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Production and turnover of ectomycorrhizal extramatrical mycelial biomass and necromass under elevated CO2 and nitrogen fertilization

Ekblad, Alf; Mikusinska, Anna; Ågren, Göran I.; Menichetti, Lorenzo; Wallander, Håkan LU ; Vilgalys, Rytas; Bahr, Adam LU and Eriksson, Ulrika (2016) In New Phytologist 211(3).
Abstract

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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Duke Forest free-air CO enrichment (FACE), Ectomycorrhiza, Elevated CO, Extramatrical mycelium, Fungal biomass, Nitrogen (N) fertilization, Stable isotopes, Turnover
in
New Phytologist
volume
211
issue
3
publisher
Wiley-Blackwell
external identifiers
  • Scopus:84964771118
ISSN
0028-646X
DOI
10.1111/nph.13961
language
English
LU publication?
yes
id
f87c0a46-dd29-4b7e-9d08-5afd2ee47a11
date added to LUP
2016-10-13 13:18:31
date last changed
2016-11-25 08:14:18
@misc{f87c0a46-dd29-4b7e-9d08-5afd2ee47a11,
  abstract     = {<p>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 CO<sub>2</sub> 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<sup>-1</sup> yr<sup>-1</sup>), whereas elevated CO<sub>2</sub> had no detectable effects. Biomass turnover was high (~13 yr<sup>-1</sup>) and unchanged by the treatments. Necromass turnover was slow and was reduced from 1.5 yr<sup>-1</sup> in the control to 0.65 yr<sup>-1</sup> 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.</p>},
  author       = {Ekblad, Alf and Mikusinska, Anna and Ågren, Göran I. and Menichetti, Lorenzo and Wallander, Håkan and Vilgalys, Rytas and Bahr, Adam and Eriksson, Ulrika},
  issn         = {0028-646X},
  keyword      = {Duke Forest free-air CO enrichment (FACE),Ectomycorrhiza,Elevated CO,Extramatrical mycelium,Fungal biomass,Nitrogen (N) fertilization,Stable isotopes,Turnover},
  language     = {eng},
  number       = {3},
  publisher    = {ARRAY(0x871cf20)},
  series       = {New Phytologist},
  title        = {Production and turnover of ectomycorrhizal extramatrical mycelial biomass and necromass under elevated CO<sub>2</sub> and nitrogen fertilization},
  url          = {http://dx.doi.org/10.1111/nph.13961},
  volume       = {211},
  year         = {2016},
}