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Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method

(2018) NEW PHYTOLOGIST. 219(4). p.1283-1299
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Abstract
Trees play a key role in the global hydrological cycle and measurements performed with the thermal dissipation method (TDM) have been crucial in providing whole-tree water-use estimates. Yet, different data processing to calculate whole-tree water use encapsulates uncertainties that have not been systematically assessed. We quantified uncertainties in conifer sap flux density (F-d) and stand water use caused by commonly applied methods for deriving zero-flow conditions, dampening and sensor calibration. Their contribution has been assessed using a stem segment calibration experiment and 4yr of TDM measurements in Picea abies and Larix decidua growing in contrasting environments. Uncertainties were then projected on TDM data from different conifers across the northern hemisphere. Commonly applied methods mostly underestimated absolute F-d. Lacking a site- and species-specific calibrations reduced our stand water-use measurements by 37% and induced uncertainty in northern hemisphere F-d. Additionally, although the interdaily variability was maintained, disregarding dampening and/or applying zero-flow conditions that ignored night-time water use reduced the correlation between environment and F-d. The presented ensemble of calibration curves and proposed dampening correction, together with the systematic quantification of data-processing uncertainties, provide crucial steps in improving whole-tree water-use estimates across spatial and temporal scales.
Keywords
NATURAL TEMPERATURE-GRADIENTS, FLUX-DENSITY MEASUREMENTS, TREE, WATER-USE, HEAT-PULSE, PICEA-ABIES, FOREST EVAPOTRANSPIRATION, STOMATAL, CONDUCTANCE, SAPFLOW MEASUREMENTS, CATCHMENT-SCALE, RADIAL PATTERNS, calibration, night-time transpiration, sap flux density, thermal, dissipation probes, transpiration, uncertainty analysis, wounding, effects

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MLA
Peters, Richard et al. “Quantification of Uncertainties in Conifer Sap Flow Measured with the Thermal Dissipation Method.” NEW PHYTOLOGIST 219.4 (2018): 1283–1299. Print.
APA
Peters, Richard, Fonti, P., Frank, D. C., Poyatos lopez, R., Pappas, C., Kahmen, A., Carraro, V., et al. (2018). Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. NEW PHYTOLOGIST, 219(4), 1283–1299.
Chicago author-date
Peters, Richard, Patrick Fonti, David C Frank, Rafael Poyatos lopez, Christoforos Pappas, Ansgar Kahmen, Vinicio Carraro, et al. 2018. “Quantification of Uncertainties in Conifer Sap Flow Measured with the Thermal Dissipation Method.” New Phytologist 219 (4): 1283–1299.
Chicago author-date (all authors)
Peters, Richard, Patrick Fonti, David C Frank, Rafael Poyatos lopez, Christoforos Pappas, Ansgar Kahmen, Vinicio Carraro, Angela Luisa Prendin, Loic Schneider, Jennifer L Baltzer, Greg A Baron-Gafford, Lars Dietrich, Ingo Heinrich, Rebecca L Minor, Oliver Sonnentag, Ashley M Matheny, Maxwell G Wightman, and Kathy Steppe. 2018. “Quantification of Uncertainties in Conifer Sap Flow Measured with the Thermal Dissipation Method.” New Phytologist 219 (4): 1283–1299.
Vancouver
1.
Peters R, Fonti P, Frank DC, Poyatos lopez R, Pappas C, Kahmen A, et al. Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method. NEW PHYTOLOGIST. 2018;219(4):1283–99.
IEEE
[1]
R. Peters et al., “Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method,” NEW PHYTOLOGIST, vol. 219, no. 4, pp. 1283–1299, 2018.
@article{8619026,
  abstract     = {Trees play a key role in the global hydrological cycle and measurements performed with the thermal dissipation method (TDM) have been crucial in providing whole-tree water-use estimates. Yet, different data processing to calculate whole-tree water use encapsulates uncertainties that have not been systematically assessed. We quantified uncertainties in conifer sap flux density (F-d) and stand water use caused by commonly applied methods for deriving zero-flow conditions, dampening and sensor calibration. Their contribution has been assessed using a stem segment calibration experiment and 4yr of TDM measurements in Picea abies and Larix decidua growing in contrasting environments. Uncertainties were then projected on TDM data from different conifers across the northern hemisphere. Commonly applied methods mostly underestimated absolute F-d. Lacking a site- and species-specific calibrations reduced our stand water-use measurements by 37% and induced uncertainty in northern hemisphere F-d. Additionally, although the interdaily variability was maintained, disregarding dampening and/or applying zero-flow conditions that ignored night-time water use reduced the correlation between environment and F-d. The presented ensemble of calibration curves and proposed dampening correction, together with the systematic quantification of data-processing uncertainties, provide crucial steps in improving whole-tree water-use estimates across spatial and temporal scales.},
  author       = {Peters, Richard and Fonti, Patrick and Frank, David C and Poyatos lopez, Rafael and Pappas, Christoforos and Kahmen, Ansgar and Carraro, Vinicio and Prendin, Angela Luisa and Schneider, Loic and Baltzer, Jennifer L and Baron-Gafford, Greg A and Dietrich, Lars and Heinrich, Ingo and Minor, Rebecca L and Sonnentag, Oliver and Matheny, Ashley M and Wightman, Maxwell G and Steppe, Kathy},
  issn         = {0028-646X},
  journal      = {NEW PHYTOLOGIST},
  keywords     = {NATURAL TEMPERATURE-GRADIENTS,FLUX-DENSITY MEASUREMENTS,TREE,WATER-USE,HEAT-PULSE,PICEA-ABIES,FOREST EVAPOTRANSPIRATION,STOMATAL,CONDUCTANCE,SAPFLOW MEASUREMENTS,CATCHMENT-SCALE,RADIAL PATTERNS,calibration,night-time transpiration,sap flux density,thermal,dissipation probes,transpiration,uncertainty analysis,wounding,effects},
  language     = {eng},
  number       = {4},
  pages        = {1283--1299},
  title        = {Quantification of uncertainties in conifer sap flow measured with the thermal dissipation method},
  url          = {http://dx.doi.org/10.1111/nph.15241},
  volume       = {219},
  year         = {2018},
}

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