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Related Experiment Videos

An alternative method to estimate zero flow temperature differences for Granier's thermal dissipation technique.

Carlos M Regalado1, Axel Ritter

  • 1Dept. Suelos y Riegos, Instituto Canario de Investigaciones Agrarias, Apdo. 60 La Laguna, 38200 S/C Tenerife, Spain. cregalad@icia.es

Tree Physiology
|May 3, 2007
PubMed
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Accurately calibrating sap flow measurements requires determining the maximum temperature difference (DeltaT(max)) when sap flow is zero. This study presents a new optimization method to calculate DeltaT(max), improving accuracy for tree water transport studies.

Area of Science:

  • Plant Physiology
  • Environmental Science
  • Forestry

Background:

  • Accurate stem sap flow measurement is crucial for understanding tree water use.
  • The Granier thermal dissipation technique relies on accurate calibration using DeltaT(max), the temperature difference at zero sap flow.
  • Current methods often underestimate DeltaT(max) due to undetected nighttime sap flow.

Purpose of the Study:

  • To develop and present a novel method for estimating DeltaT(max) without assuming zero nighttime sap flow.
  • To address the amplification of errors in sap flux density computations caused by inaccurate DeltaT(max).
  • To provide a more reliable calibration for heat-based sap flow systems.

Main Methods:

  • A sensitivity analysis was performed to demonstrate the impact of DeltaT(max) errors.

Related Experiment Videos

  • An optimization method was derived by rearranging Granier's formula.
  • The method utilizes simultaneous measurements of diurnal DeltaT and micrometeorological variables.

    • Main Results:

    • The proposed optimization method provides an alternative to the traditional predawn DeltaT estimation for DeltaT(max).
    • Calculated DeltaT(max) values using the new method often differ from those estimated at night.
    • The method was successfully applied to both needle-like and broadleaf tree species.

    Conclusions:

    • The new method offers a more robust approach to determining DeltaT(max) for sap flow calibration.
    • This technique can potentially improve the accuracy of sap flux density measurements in trees.
    • The procedure is adaptable to various heat-based sap flow systems, enhancing their applicability.