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Response of ericoid mycorrhizal colonization and functioning to global change factors

Olsrud, Maria LU ; Melillo, J M; Christensen, Torben LU ; Michelsen, A; Wallander, Håkan LU and Olsson, Pål Axel LU (2004) In New Phytologist 162(2). p.459-469
Abstract
Here, we investigated effects of increased atmospheric CO2 concentration, increased temperatures, and both factors in combination on ericoid mycorrhizal colonization, mycorrhizal functioning and below-ground carbon allocation in a subarctic forest understorey, to evaluate the hypothesis that photosynthesis is a primary driver for mycorrhizal colonization. Treatment effects on ecosystem processes were investigated using C-14-pulse labelling and photosynthesis measurements in combination with analysis of ergosterol content in roots. The effects on delta(15)N in leaves were also studied. Ergosterol content in hair roots was positively correlated with ecosystem photosynthesis and was higher in heat- and CO2-treated plots. Leaves from CO2 Plots... (More)
Here, we investigated effects of increased atmospheric CO2 concentration, increased temperatures, and both factors in combination on ericoid mycorrhizal colonization, mycorrhizal functioning and below-ground carbon allocation in a subarctic forest understorey, to evaluate the hypothesis that photosynthesis is a primary driver for mycorrhizal colonization. Treatment effects on ecosystem processes were investigated using C-14-pulse labelling and photosynthesis measurements in combination with analysis of ergosterol content in roots. The effects on delta(15)N in leaves were also studied. Ergosterol content in hair roots was positively correlated with ecosystem photosynthesis and was higher in heat- and CO2-treated plots. Leaves from CO2 Plots tended to be more depleted in N-15 compared with controls both for Vaccinium myrtillus and V. vitis-idaea. Our results suggest that changes in ecosystem photosynthesis, plant carbon (C) Allocation may give rise to changing mycorrhizal colonization under elevated CO2 and temperature. The role of mycorrhizas in ecosystem N-cycling may change on a long-term basis as inorganic N availability declines with increasing levels of atmospheric CO2. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
New Phytologist
volume
162
issue
2
pages
459 - 469
publisher
Wiley-Blackwell
external identifiers
  • wos:000221058900019
  • scopus:1942443218
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2004.01049.x
language
English
LU publication?
yes
id
66e5ec8e-345b-4640-8ef2-ff757eebccc8 (old id 135652)
date added to LUP
2007-06-29 13:50:22
date last changed
2017-10-22 03:32:43
@article{66e5ec8e-345b-4640-8ef2-ff757eebccc8,
  abstract     = {Here, we investigated effects of increased atmospheric CO2 concentration, increased temperatures, and both factors in combination on ericoid mycorrhizal colonization, mycorrhizal functioning and below-ground carbon allocation in a subarctic forest understorey, to evaluate the hypothesis that photosynthesis is a primary driver for mycorrhizal colonization. Treatment effects on ecosystem processes were investigated using C-14-pulse labelling and photosynthesis measurements in combination with analysis of ergosterol content in roots. The effects on delta(15)N in leaves were also studied. Ergosterol content in hair roots was positively correlated with ecosystem photosynthesis and was higher in heat- and CO2-treated plots. Leaves from CO2 Plots tended to be more depleted in N-15 compared with controls both for Vaccinium myrtillus and V. vitis-idaea. Our results suggest that changes in ecosystem photosynthesis, plant carbon (C) Allocation may give rise to changing mycorrhizal colonization under elevated CO2 and temperature. The role of mycorrhizas in ecosystem N-cycling may change on a long-term basis as inorganic N availability declines with increasing levels of atmospheric CO2.},
  author       = {Olsrud, Maria and Melillo, J M and Christensen, Torben and Michelsen, A and Wallander, Håkan and Olsson, Pål Axel},
  issn         = {1469-8137},
  language     = {eng},
  number       = {2},
  pages        = {459--469},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Response of ericoid mycorrhizal colonization and functioning to global change factors},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2004.01049.x},
  volume       = {162},
  year         = {2004},
}