The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Kathy Steppe - One of the best experts on this subject based on the ideXlab platform.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO 2 . 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. Stem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration. This study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season. EA 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. Axial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light. 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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:AbstractKey messageEfflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO2. Light-induced Axial CO2Diffusion 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.ContextStem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration.AimsThis study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season.MethodsEA 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.ResultsAxial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light.ConclusionDormant-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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
Linus De Roo - One of the best experts on this subject based on the ideXlab platform.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO 2 . 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. Stem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration. This study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season. EA 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. Axial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light. 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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:AbstractKey messageEfflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO2. Light-induced Axial CO2Diffusion 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.ContextStem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration.AimsThis study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season.MethodsEA 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.ResultsAxial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light.ConclusionDormant-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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
Cong Tam Nguyen - One of the best experts on this subject based on the ideXlab platform.
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effects of Axial Diffusion on laminar heat transfer with low pe clet numbers in the entrance region of thin vertical tubes
Numerical Heat Transfer Part A-applications, 1998Co-Authors: H. Nesreddine, N. Galanis, Cong Tam NguyenAbstract:Laminar upward and downward flows with mixed convection in a thin vertical tube with a short uniformly heated section were investigated numerically. Calculations were performed by solving the elliptic Navier-Stokes and energy equations for slow flows of air (Pr = 0.7) corresponding to low Reynolds numbers from 20 to 500 and a wide range of Grashof numbers. Results reveal that Axial Diffusion plays a significant role in preheating the fluid upstream from the entrance of the heat transfer region for both aiding and opposing buoyancy, with a stronger effect for the latter, and can lead to flow reversal. By mapping the conditions that correspond to significant preheating and flow reversal on a Grashof-Reynolds plane, it has become possible to establish criteria that determine (1) when the upstream boundary conditions can be applied at the entrance of the heated section and (2) when the elliptical formulation is necessary to describe the flow field accurately. Applications in which this regime of mixed convection occur include shell-tube heat exchangers, and nuclear reactors.
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Effects of Axial Diffusion on laminar heat transfer with low Péclet numbers in the entrance region of thin vertical tubes
Numerical Heat Transfer Part A: Applications, 1998Co-Authors: H. Nesreddine, N. Galanis, Cong Tam NguyenAbstract:Laminar upward and downward flows with mixed convection in a thin vertical tube with a short uniformly heated section were investigated numerically. Calculations were performed by solving the elliptic Navier-Stokes and energy equations for slow flows of air (Pr = 0.7) corresponding to low Reynolds numbers from 20 to 500 and a wide range of Grashof numbers. Results reveal that Axial Diffusion plays a significant role in preheating the fluid upstream from the entrance of the heat transfer region for both aiding and opposing buoyancy, with a stronger effect for the latter, and can lead to flow reversal. By mapping the conditions that correspond to significant preheating and flow reversal on a Grashof-Reynolds plane, it has become possible to establish criteria that determine (1) when the upstream boundary conditions can be applied at the entrance of the heated section and (2) when the elliptical formulation is necessary to describe the flow field accurately. Applications in which this regime of mixed convection occur include shell-tube heat exchangers, and nuclear reactors.
Jasper Bloemen - One of the best experts on this subject based on the ideXlab platform.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO 2 . 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. Stem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration. This study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season. EA 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. Axial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light. 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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:AbstractKey messageEfflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO2. Light-induced Axial CO2Diffusion 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.ContextStem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration.AimsThis study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season.MethodsEA 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.ResultsAxial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light.ConclusionDormant-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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
Yentl Dupon - One of the best experts on this subject based on the ideXlab platform.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:Efflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO 2 . 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. Stem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration. This study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season. EA 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. Axial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light. 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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
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Axial Diffusion of respired CO2 confounds stem respiration estimates during the dormant season
Annals of Forest Science, 2019Co-Authors: Linus De Roo, Jasper Bloemen, Yentl Dupon, Roberto L. Salomón, Kathy SteppeAbstract:AbstractKey messageEfflux-based estimates of stem respiration in oak trees during the dormant season were biased by Axial Diffusion of locally respired CO2. Light-induced Axial CO2Diffusion 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.ContextStem CO2 efflux (EA) 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 EA during the dormant season when there is no transpiration.AimsThis study investigated to which extent woody tissue photosynthesis and Axial Diffusion of respired CO2 affect EA during the dormant season.MethodsEA 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.ResultsAxial Diffusion of respired CO2 led to reductions in EA of up to 22% when the stem section closest to the cuvette was exposed to light.ConclusionDormant-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 EA coefficients (Q10 and EA_0) generally used to estimate maintenance respiration throughout the year.
