10.5061/DRYAD.K3C78V7
Hagenbo, Andreas
Swedish University of Agricultural Sciences
Hadden, David
Swedish University of Agricultural Sciences
Clemmensen, Karina E.
Swedish University of Agricultural Sciences
Grelle, Achim
Swedish University of Agricultural Sciences
Manzoni, Stefano
Stockholm University
Mölder, Meelis
Lund University
Ekblad, Alf
Örebro University
Fransson, Petra
Swedish University of Agricultural Sciences
Data from: Carbon use efficiency of mycorrhizal fungal mycelium increases
during the growing season but decreases with forest age across a Pinus
sylvestris chronosequence
Dryad
dataset
2019
Ectomycorrhiza
mycelial respiration
Carbon use efficiency
Boreal
extraradical mycelium
Soil respiration
Pinus sylvestris
mycelial biomass
2019-05-23T19:05:11Z
2019-05-23T19:05:11Z
en
https://doi.org/10.1111/1365-2745.13209
36006 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
1. In boreal forest soils, mycelium of mycorrhizal fungi is pivotal for
regulating soil carbon (C) cycling and storage. The carbon use efficiency
(CUE), a key parameter in C cycling models, can inform on the partitioning
of C between microbial biomass, and potential soil storage, and
respiration. Here we test the dependency of mycorrhizal mycelial CUE on
stand age and seasonality in managed boreal forest stands. 2. Based on
mycelial production and respiration estimates, derived from sequentially
incubated ingrowth mesh bags, we estimated CUE on an ecosystem-scale
during a seasonal cycle and across a chronosequence of eight, 12- to
158-years-old, managed Pinus sylvestris forest stands characterised by
decreasing pH and nitrogen (N) availability with increasing age. Mycelial
respiration was related to total soil respiration, and by using eddy
covariance flux measurements, primary production (GPP) was estimated in
the 12- and 100-years-old forests, and related to mycelial respiration and
CUE. 3. As hypothesized, mycelial CUE decreased significantly with
increasing forest age by c. 65%, supposedly related to a shift in
mycorrhizal community composition and a metabolic adjustment to reduce
their own biomass N demand with declining soil N availability.
Furthermore, mycelial CUE increased by a factor of five over the growing
season; from 0.03 in May to 0.15 in November, and we propose that the
seasonal change in CUE is regulated by a decrease in photosynthate
production and temperature. The respiratory contribution of mycorrhizal
mycelium ranged from 14 to 26% of total soil respiration, and was on
average 17% across all sites and occasions. 4. Synthesis: Carbon is
retained more efficiently in mycorrhizal mycelium late in the growing
season, when fungi have access to a more balanced C and nutrient supplies.
Earlier in the growing season, at maximum host plant photosynthesis, when
belowground C availability is high in relation to N, the fungi respire
excess C resulting in lower mycelial CUE. Additionally, C is retained less
efficiently in mycorrhizal fungal biomass in older forest stands
characterized by more nutrient depleted soils than younger forest stands.
Mycorrhizal fungal mycelium - carbon use efficiencyData on respiration,
carbon use efficiency, mycelial biomass, mycelial production, gross
primary production and sporocarp production. Biomass estimates are based
on amounts of ergosterol (a fungal-specific biomass marker), quantified
using liquid chromatography. Growth estimates are derived from biomass
estimates and mathematical models. Estimates of carbon use efficiency are
based on growth and respiration estimates. Gross primary production
estimates are based on eddy covariance flux measurements.Dryad.xlsx
Sweden
central Sweden
Uppsala County