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Axial diffusion of respired CO2 confounds stem respiration estimates during the dormant season

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Abstract
Key message: Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by axial diffusion of locally respired CO2. Light-induced axial CO(2)diffusion along the stem due to woody tissue photosynthesis may lead to equivocal estimates of stem respiratory coefficients during the dormant season, which are generally used to estimate maintenance respiration throughout the year. Context: Stem CO2 efflux (E-A) does not reflect respiratory rates of underlying tissues. Recent research has focused on the significance of CO2 transport via the transpiration stream. However, no studies have yet addressed the potential role of light-induced axial CO2 diffusion on E-A during the dormant season when there is no transpiration. Aims: This study investigated to which extent woody tissue photosynthesis and axial diffusion of respired CO2 affect E-A during the dormant season. Methods: E(A) was measured in a stem cuvette on dormant oak trees in a growth chamber at constant temperature. Different rates of axial CO2 diffusion were induced by woody tissue photosynthesis by means of illuminating stem sections at varying distances from the stem cuvette, while light was excluded from the remainder of the tree. Results: Axial diffusion of respired CO2 led to reductions in E-A of up to 22% when the stem section closest to the cuvette was exposed to light. Conclusion: Dormant-season efflux-based estimates of stem respiration might be biased by axial diffusion of respired CO2, particularly in open forest stands with sufficient light penetration. Consequently, this may lead to ambiguous estimates of dormant season E-A coefficients (Q(10) and E-A_0) generally used to estimate maintenance respiration throughout the year.
Keywords
BETWEEN-TREE VARIATION, MAINTENANCE RESPIRATION, DAYTIME DEPRESSION, EXTERNAL FLUXES, NORWAY SPRUCE, EFFLUX RATES, WITHIN-TREE, SAP FLOW, TEMPERATURE, XYLEM, Quercus robur L, Woody tissue photosynthesis, Stem CO2 efflux, Internal, CO2 transport, Maintenance respiration

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Citation

Please use this url to cite or link to this publication:

MLA
De Roo, Linus et al. “Axial Diffusion of Respired CO2 Confounds Stem Respiration Estimates During the Dormant Season.” ANNALS OF FOREST SCIENCE 76.2 (2019): n. pag. Print.
APA
De Roo, L., Bloemen, J., Dupon, Y., Salomon Moreno, R. L., & Steppe, K. (2019). Axial diffusion of respired CO2 confounds stem respiration estimates during the dormant season. ANNALS OF FOREST SCIENCE, 76(2).
Chicago author-date
De Roo, Linus, Jasper Bloemen, Yentl Dupon, Roberto Luis Salomon Moreno, and Kathy Steppe. 2019. “Axial Diffusion of Respired CO2 Confounds Stem Respiration Estimates During the Dormant Season.” Annals of Forest Science 76 (2).
Chicago author-date (all authors)
De Roo, Linus, Jasper Bloemen, Yentl Dupon, Roberto Luis Salomon Moreno, and Kathy Steppe. 2019. “Axial Diffusion of Respired CO2 Confounds Stem Respiration Estimates During the Dormant Season.” Annals of Forest Science 76 (2).
Vancouver
1.
De Roo L, Bloemen J, Dupon Y, Salomon Moreno RL, Steppe K. Axial diffusion of respired CO2 confounds stem respiration estimates during the dormant season. ANNALS OF FOREST SCIENCE. 2019;76(2).
IEEE
[1]
L. De Roo, J. Bloemen, Y. Dupon, R. L. Salomon Moreno, and K. Steppe, “Axial diffusion of respired CO2 confounds stem respiration estimates during the dormant season,” ANNALS OF FOREST SCIENCE, vol. 76, no. 2, 2019.
@article{8619055,
  abstract     = {Key message: Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by axial diffusion of locally respired CO2. Light-induced axial CO(2)diffusion along the stem due to woody tissue photosynthesis may lead to equivocal estimates of stem respiratory coefficients during the dormant season, which are generally used to estimate maintenance respiration throughout the year.
Context: Stem CO2 efflux (E-A) does not reflect respiratory rates of underlying tissues. Recent research has focused on the significance of CO2 transport via the transpiration stream. However, no studies have yet addressed the potential role of light-induced axial CO2 diffusion on E-A during the dormant season when there is no transpiration.
Aims: This study investigated to which extent woody tissue photosynthesis and axial diffusion of respired CO2 affect E-A during the dormant season.
Methods: E(A) was measured in a stem cuvette on dormant oak trees in a growth chamber at constant temperature. Different rates of axial CO2 diffusion were induced by woody tissue photosynthesis by means of illuminating stem sections at varying distances from the stem cuvette, while light was excluded from the remainder of the tree.
Results: Axial diffusion of respired CO2 led to reductions in E-A of up to 22% when the stem section closest to the cuvette was exposed to light.
Conclusion: Dormant-season efflux-based estimates of stem respiration might be biased by axial diffusion of respired CO2, particularly in open forest stands with sufficient light penetration. Consequently, this may lead to ambiguous estimates of dormant season E-A coefficients (Q(10) and E-A_0) generally used to estimate maintenance respiration throughout the year.},
  articleno    = {52},
  author       = {De Roo, Linus and Bloemen, Jasper and Dupon, Yentl and Salomon Moreno, Roberto Luis and Steppe, Kathy},
  issn         = {1286-4560},
  journal      = {ANNALS OF FOREST SCIENCE},
  keywords     = {BETWEEN-TREE VARIATION,MAINTENANCE RESPIRATION,DAYTIME DEPRESSION,EXTERNAL FLUXES,NORWAY SPRUCE,EFFLUX RATES,WITHIN-TREE,SAP FLOW,TEMPERATURE,XYLEM,Quercus robur L,Woody tissue photosynthesis,Stem CO2 efflux,Internal,CO2 transport,Maintenance respiration},
  language     = {eng},
  number       = {2},
  pages        = {11},
  title        = {Axial diffusion of respired CO2 confounds stem respiration estimates during the dormant season},
  url          = {http://dx.doi.org/10.1007/s13595-019-0839-6},
  volume       = {76},
  year         = {2019},
}

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