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Comparing ∆Tmax Determination Approaches for Granier-Based Sapflow Estimations.

Inken Rabbel1, Bernd Diekkrüger2, Holm Voigt3

  • 1Department of Geography, University of Bonn, Meckenheimer Allee 166, 53115 Bonn, Germany. irabbel@uni-bonn.de.

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|December 6, 2016
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Determining the maximum temperature gradient (∆Tmax) is crucial for accurate tree water use estimation using sapflow sensors. Different methods for calculating ∆Tmax significantly impact sapflow calculations, highlighting a key source of uncertainty in forest hydrology research.

Keywords:
Norway sprucePicea abiesdata processingheat dissipationmaximum temperature gradientthermal dissipationtranspiration

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Area of Science:

  • Forest hydrology
  • Plant physiology
  • Environmental science

Background:

  • Granier-type thermal dissipation probes are widely used to measure tree water use.
  • Accurate sapflow estimation relies on determining the maximum temperature gradient (∆Tmax), representing zero sap flux.
  • Traditional methods assume zero sap flux occurs nightly, but continuous nighttime sapflow challenges this assumption.

Purpose of the Study:

  • To analyze the impact of various ∆Tmax determination approaches on sapflow density (Fd) estimations.
  • To quantify the uncertainty in sapflow calculations stemming from raw signal processing.
  • To assess the influence of ∆Tmax determination on sub-daily, daily, and seasonal sapflow estimates.

Main Methods:

  • Comparison of different approaches for determining ∆Tmax in Granier-type sapflow sensors.
  • Analysis of the sensitivity of the empirical equation relating ∆T to sap flux density (Fd) to ∆Tmax.
  • Evaluation of the effects of ∆Tmax determination on sapflow estimates at various temporal scales.

Main Results:

  • The procedure used to determine ∆Tmax significantly influences absolute ∆Tmax values.
  • Different ∆Tmax determination methods lead to substantial variations in sap flux density computations.
  • The choice of ∆Tmax approach is a major contributor to uncertainty in sapflow estimations.

Conclusions:

  • The method for determining ∆Tmax is a critical factor affecting sapflow accuracy.
  • Standardized or improved methods for ∆Tmax determination are needed to reduce uncertainty in tree water use research.
  • Understanding and addressing ∆Tmax determination variability is essential for reliable forest hydrological studies.