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Precision weighing lysimetry for trees, using a simplified tared-balance design.

W R Edwards1

  • 1Soil Conservation Centre, Aokautere. Ministry of Works and Development, Private Bag, Palmerston North, New Zealand.

Tree Physiology
|September 1, 1986
PubMed
Summary
This summary is machine-generated.

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Weighing lysimeters accurately measured tree transpiration, revealing seasonal and daily patterns. Isolated trees intercept more rainfall and evaporate more from their canopies than previously thought.

Area of Science:

  • Environmental Science
  • Plant Physiology
  • Agricultural Engineering

Background:

  • Accurate measurement of tree transpiration is crucial for understanding water cycles.
  • Traditional methods may have limitations in precision and environmental influence.

Purpose of the Study:

  • To develop and validate a precise weighing lysimeter system for estimating transpiration in isolated trees.
  • To analyze seasonal and diurnal transpiration patterns in various tree species.
  • To quantify precipitation interception and canopy evaporation in isolated trees during rainfall.

Main Methods:

  • Utilized four weighing lysimeters (1.8 m diameter, 1 m depth) with a novel wire rope torsion tube system for tare weight.
  • Employed load cells for precise weight difference measurements, unaffected by hysteresis or temperature.

Related Experiment Videos

  • Conducted daily measurements over yearly periods for multiple tree species, allowing for tree replacement.

    • Main Results:

    • Achieved measurement sensitivity better than 100 g under windless conditions.
    • Observed sigmoid seasonal and diurnal transpiration patterns correlated with micrometeorological variables.
    • Found that isolated trees intercept significantly more precipitation than uniform crops and exhibit substantial canopy evaporation during rain.

    Conclusions:

    • The developed weighing lysimeter system offers high sensitivity and reliability for tree transpiration studies.
    • Transpiration patterns are species-specific and closely linked to environmental factors.
    • Isolated trees play a significant role in local water balance through high precipitation interception and canopy evaporation.