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Short-term dynamics of abiotic and biotic soil (CO2)-C-13 effluxes after in situ (CO2)-C-13 pulse labelling of a boreal pine forest

Subke, Jens-Arne; Vallack, Harry W.; Magnusson, Tord; Keel, Sonja G.; Metcalfe, Dan LU ; Hogberg, Peter and Ineson, Phil (2009) In New Phytologist 183(2). p.349-357
Abstract
P>Physical diffusion of isotopic tracers into and out of soil pores causes considerable uncertainty for the timing and magnitude of plant belowground allocation in pulse-labelling experiments. Here, we partitioned soil CO2 isotopic fluxes into abiotic tracer flux (physical return), heterotrophic flux, and autotrophic flux contributions following (CO2)-C-13 labelling of a Swedish Pinus sylvestris forest. Soil CO2 efflux and its isotopic composition from a combination of deep and surface soil collars was monitored using a field-deployed mass spectrometer. Additionally, (CO2)-C-13 within the soil profile was monitored. Physical (abiotic) efflux of (CO2)-C-13 from soil pore spaces was found to be significant for up to 48 h after pulse... (More)
P>Physical diffusion of isotopic tracers into and out of soil pores causes considerable uncertainty for the timing and magnitude of plant belowground allocation in pulse-labelling experiments. Here, we partitioned soil CO2 isotopic fluxes into abiotic tracer flux (physical return), heterotrophic flux, and autotrophic flux contributions following (CO2)-C-13 labelling of a Swedish Pinus sylvestris forest. Soil CO2 efflux and its isotopic composition from a combination of deep and surface soil collars was monitored using a field-deployed mass spectrometer. Additionally, (CO2)-C-13 within the soil profile was monitored. Physical (abiotic) efflux of (CO2)-C-13 from soil pore spaces was found to be significant for up to 48 h after pulse labelling, and equalled the amount of biotic label flux over 6 d. Measured and modelled changes in (CO2)-C-13 concentration throughout the soil profile corroborated these results. Tracer return via soil CO2 efflux correlated significantly with the proximity of collars to trees, while daily amplitudes of total flux (including heterotrophic and autotrophic sources) showed surprising time shifts compared with heterotrophic fluxes. The results show for the first time the significance of the confounding influence of physical isotopic CO2-tracer return from the soil matrix, calling for the inclusion of meaningful control treatments in future pulse-chase experiments. New Phytologist (2009) 183: 349-357doi: 10.1111/j.1469-8137.2009.02883.x. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
(CO2)-C-13, autotrophic respiration, pulse labelling, soil CO2 efflux, soil CO2 efflux partitioning, soil CO2 transport modelling, stable, isotopes
in
New Phytologist
volume
183
issue
2
pages
349 - 357
publisher
Wiley-Blackwell
external identifiers
  • wos:000267427500013
  • scopus:67649488282
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2009.02883.x
language
English
LU publication?
no
id
fb5e408a-df07-4d35-ae7a-9bcb47cee9de (old id 4644051)
date added to LUP
2014-09-23 15:25:44
date last changed
2017-09-17 05:04:44
@article{fb5e408a-df07-4d35-ae7a-9bcb47cee9de,
  abstract     = {P>Physical diffusion of isotopic tracers into and out of soil pores causes considerable uncertainty for the timing and magnitude of plant belowground allocation in pulse-labelling experiments. Here, we partitioned soil CO2 isotopic fluxes into abiotic tracer flux (physical return), heterotrophic flux, and autotrophic flux contributions following (CO2)-C-13 labelling of a Swedish Pinus sylvestris forest. Soil CO2 efflux and its isotopic composition from a combination of deep and surface soil collars was monitored using a field-deployed mass spectrometer. Additionally, (CO2)-C-13 within the soil profile was monitored. Physical (abiotic) efflux of (CO2)-C-13 from soil pore spaces was found to be significant for up to 48 h after pulse labelling, and equalled the amount of biotic label flux over 6 d. Measured and modelled changes in (CO2)-C-13 concentration throughout the soil profile corroborated these results. Tracer return via soil CO2 efflux correlated significantly with the proximity of collars to trees, while daily amplitudes of total flux (including heterotrophic and autotrophic sources) showed surprising time shifts compared with heterotrophic fluxes. The results show for the first time the significance of the confounding influence of physical isotopic CO2-tracer return from the soil matrix, calling for the inclusion of meaningful control treatments in future pulse-chase experiments. New Phytologist (2009) 183: 349-357doi: 10.1111/j.1469-8137.2009.02883.x.},
  author       = {Subke, Jens-Arne and Vallack, Harry W. and Magnusson, Tord and Keel, Sonja G. and Metcalfe, Dan and Hogberg, Peter and Ineson, Phil},
  issn         = {1469-8137},
  keyword      = {(CO2)-C-13,autotrophic respiration,pulse labelling,soil CO2 efflux,soil CO2 efflux partitioning,soil CO2 transport modelling,stable,isotopes},
  language     = {eng},
  number       = {2},
  pages        = {349--357},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Short-term dynamics of abiotic and biotic soil (CO2)-C-13 effluxes after in situ (CO2)-C-13 pulse labelling of a boreal pine forest},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2009.02883.x},
  volume       = {183},
  year         = {2009},
}