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Increased nitrous oxide emissions from a drained organic forest soil after exclusion of ectomycorrhizal mycelia

Ernfors, M; Rutting, T and Klemedtsson, L (2011) In Plant and Soil 343(02-jan). p.161-170
Abstract
The aim of this study was to determine how roots and their ectomycorrhizal symbionts affect the fluxes of nitrous oxide (N2O) from nutrient-rich drained organic forest soils. Specifically, the relative impacts of roots and mycorrhizal mycelia on N2O fluxes were investigated using two different trenching treatments, excluding (a) roots or (b) roots and mycorrhizal mycelia, from the soil. N2O fluxes were measured at the soil surface, for 1 year before and 2.5 years after trenching, within the two trenching treatments and on untreated controls. While the exclusion of roots alone did not affect N2O emissions, the simultaneous exclusion of roots and mycorrhizal mycelia doubled N2O emissions, compared to the control plots. Two probable... (More)
The aim of this study was to determine how roots and their ectomycorrhizal symbionts affect the fluxes of nitrous oxide (N2O) from nutrient-rich drained organic forest soils. Specifically, the relative impacts of roots and mycorrhizal mycelia on N2O fluxes were investigated using two different trenching treatments, excluding (a) roots or (b) roots and mycorrhizal mycelia, from the soil. N2O fluxes were measured at the soil surface, for 1 year before and 2.5 years after trenching, within the two trenching treatments and on untreated controls. While the exclusion of roots alone did not affect N2O emissions, the simultaneous exclusion of roots and mycorrhizal mycelia doubled N2O emissions, compared to the control plots. Two probable explanations for the increased fluxes were identified: (1) a decreased uptake of nitrogen (N) from the soil, through the mycorrhizal fungi, which increased N availability for the N2O-producing microorganisms, and (2) a decreased uptake of water from the soil, through the mycorrhiza, which increased the soil water content and thus the N2O emissions from denitrification. If the trenching reduced any potential stimulation of N cycling, through rhizodeposition, this mechanism did not outweigh the effects of a discontinued mycorrhizal N and/or water uptake on N2O fluxes. The results of the study emphasise the importance of ectomycorrhiza in regulating N2O emissions from forested organic soils. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nitrous oxide, Roots, Ectomycorrhiza, Drained organic soil, Picea abies
in
Plant and Soil
volume
343
issue
02-jan
pages
161 - 170
publisher
Springer
external identifiers
  • scopus:79956069434
ISSN
0032-079X
DOI
10.1007/s11104-010-0667-9
project
BECC
language
English
LU publication?
no
id
3d62d337-0947-4cc5-850e-a29518fd0859 (old id 4448633)
date added to LUP
2014-05-23 12:11:22
date last changed
2017-11-12 03:47:23
@article{3d62d337-0947-4cc5-850e-a29518fd0859,
  abstract     = {The aim of this study was to determine how roots and their ectomycorrhizal symbionts affect the fluxes of nitrous oxide (N2O) from nutrient-rich drained organic forest soils. Specifically, the relative impacts of roots and mycorrhizal mycelia on N2O fluxes were investigated using two different trenching treatments, excluding (a) roots or (b) roots and mycorrhizal mycelia, from the soil. N2O fluxes were measured at the soil surface, for 1 year before and 2.5 years after trenching, within the two trenching treatments and on untreated controls. While the exclusion of roots alone did not affect N2O emissions, the simultaneous exclusion of roots and mycorrhizal mycelia doubled N2O emissions, compared to the control plots. Two probable explanations for the increased fluxes were identified: (1) a decreased uptake of nitrogen (N) from the soil, through the mycorrhizal fungi, which increased N availability for the N2O-producing microorganisms, and (2) a decreased uptake of water from the soil, through the mycorrhiza, which increased the soil water content and thus the N2O emissions from denitrification. If the trenching reduced any potential stimulation of N cycling, through rhizodeposition, this mechanism did not outweigh the effects of a discontinued mycorrhizal N and/or water uptake on N2O fluxes. The results of the study emphasise the importance of ectomycorrhiza in regulating N2O emissions from forested organic soils.},
  author       = {Ernfors, M and Rutting, T and Klemedtsson, L},
  issn         = {0032-079X},
  keyword      = {Nitrous oxide,Roots,Ectomycorrhiza,Drained organic soil,Picea abies},
  language     = {eng},
  number       = {02-jan},
  pages        = {161--170},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Increased nitrous oxide emissions from a drained organic forest soil after exclusion of ectomycorrhizal mycelia},
  url          = {http://dx.doi.org/10.1007/s11104-010-0667-9},
  volume       = {343},
  year         = {2011},
}