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Annual ecosystem respiration budget for a Pinus sylvestris stand in central Siberia.

Shibistova, O; Lloyd, J; Zrazewhskava, G; Arneth, Almut LU ; Knohl, A; Kolle, O and Schulze, ED (2002) In Tellus, Series B: Chemical and Physical Meteorology. 54(5). p.568-589
Abstract
Using a ground-based and an above-canopy eddy covariance system in addition to stem respiration measurements, the annual respiratory fluxes attributable to soil, stems and foliage were determined for a Scots pine (Pinus sylvestris L.) forest growing in central Siberia. Night-time foliar respiration was estimated on the basis of the difference between fluxes measured below and above the canopy and the stem respiration measurements. Comparison of the effects of night-time turbulence on measured CO2 fluxes showed flux loss above the canopy at low wind speeds, but no such effect was observed for the ground-based eddy system. This suggests that problems with flow homogeneity or flux divergence (both of which would be expected to be greater... (More)
Using a ground-based and an above-canopy eddy covariance system in addition to stem respiration measurements, the annual respiratory fluxes attributable to soil, stems and foliage were determined for a Scots pine (Pinus sylvestris L.) forest growing in central Siberia. Night-time foliar respiration was estimated on the basis of the difference between fluxes measured below and above the canopy and the stem respiration measurements. Comparison of the effects of night-time turbulence on measured CO2 fluxes showed flux loss above the canopy at low wind speeds, but no such effect was observed for the ground-based eddy system. This suggests that problems with flow homogeneity or flux divergence (both of which would be expected to be greater above the canopy than below) were responsible for above-canopy losses under these conditions. After correcting for this, a strong seasonality in foliar respiration was observed. This was not solely attributable to temperature variations, with intrinsic foliar respiratory capacities being much greater in spring and autumn. The opposite pattern was observed for stem respiration, with the intrinsic respiratory capacity being lower from autumn through early spring. Maximum respiratory activity was observed in early summer. This was not simply associated with a response to higher temperatures but seemed closely linked with cambial activity and the development of new xylem elements. Soil respiration rates exhibited an apparent high sensitivity to temperature, with seasonal data implying a Q10 of about 7. We interpret this as reflecting covarying changes in soil microbial activity and soil temperatures throughout the snow-free season. Averaged over the two study years (1999 and 2000), the annual respiratory flux was estimated at 38.3 mol C m-2 a-1. Of this 0.61 was attributable to soil respiration, with stem respiration accounting for 0.21 and foliar respiration 0.18. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Tellus, Series B: Chemical and Physical Meteorology.
volume
54
issue
5
pages
568 - 589
publisher
Taylor & Francis
external identifiers
  • scopus:0036869178
ISSN
0280-6509
DOI
10.1034/j.1600-0889.2002.01488.x
language
English
LU publication?
no
id
949448e5-26fc-4ad1-86d8-5a891d4b2165 (old id 590163)
date added to LUP
2007-11-09 11:23:03
date last changed
2017-04-09 04:37:22
@article{949448e5-26fc-4ad1-86d8-5a891d4b2165,
  abstract     = {Using a ground-based and an above-canopy eddy covariance system in addition to stem respiration measurements, the annual respiratory fluxes attributable to soil, stems and foliage were determined for a Scots pine (Pinus sylvestris L.) forest growing in central Siberia. Night-time foliar respiration was estimated on the basis of the difference between fluxes measured below and above the canopy and the stem respiration measurements. Comparison of the effects of night-time turbulence on measured CO2 fluxes showed flux loss above the canopy at low wind speeds, but no such effect was observed for the ground-based eddy system. This suggests that problems with flow homogeneity or flux divergence (both of which would be expected to be greater above the canopy than below) were responsible for above-canopy losses under these conditions. After correcting for this, a strong seasonality in foliar respiration was observed. This was not solely attributable to temperature variations, with intrinsic foliar respiratory capacities being much greater in spring and autumn. The opposite pattern was observed for stem respiration, with the intrinsic respiratory capacity being lower from autumn through early spring. Maximum respiratory activity was observed in early summer. This was not simply associated with a response to higher temperatures but seemed closely linked with cambial activity and the development of new xylem elements. Soil respiration rates exhibited an apparent high sensitivity to temperature, with seasonal data implying a Q10 of about 7. We interpret this as reflecting covarying changes in soil microbial activity and soil temperatures throughout the snow-free season. Averaged over the two study years (1999 and 2000), the annual respiratory flux was estimated at 38.3 mol C m-2 a-1. Of this 0.61 was attributable to soil respiration, with stem respiration accounting for 0.21 and foliar respiration 0.18.},
  author       = {Shibistova, O and Lloyd, J and Zrazewhskava, G and Arneth, Almut and Knohl, A and Kolle, O and Schulze, ED},
  issn         = {0280-6509},
  language     = {eng},
  number       = {5},
  pages        = {568--589},
  publisher    = {Taylor & Francis},
  series       = {Tellus, Series B: Chemical and Physical Meteorology.},
  title        = {Annual ecosystem respiration budget for a Pinus sylvestris stand in central Siberia.},
  url          = {http://dx.doi.org/10.1034/j.1600-0889.2002.01488.x},
  volume       = {54},
  year         = {2002},
}