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Related Experiment Videos

Link between diurnal stem radius changes and tree water relations.

R Zweifel1, H Item, R Häsler

  • 1Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland.

Tree Physiology
|August 11, 2001
PubMed
Summary

Trees utilize internal water reserves daily, impacting tree water relations. Stored water in needles and bark significantly contributes to daily transpiration, especially on cloudy days.

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Area of Science:

  • Plant Physiology
  • Forest Ecology
  • Biophysics

Background:

  • Trees, like succulents, store and release internal water daily.
  • Understanding tissue water storage is crucial for tree water relations.

Purpose of the Study:

  • Investigate the significance of diurnal tissue water storage in Norway spruce trees.
  • Quantify the contribution of stored water to whole-tree transpiration.

Main Methods:

  • Monitored diurnal stem radius fluctuations, whole-tree transpiration rate (T), and sap flow in potted Norway spruce.
  • Developed a physical flow and storage model driven by transpiration rate (T) to simulate water dynamics.

Main Results:

  • Stem radius fluctuations in Picea abies are linearly coupled to bark water content.

Related Experiment Videos

  • The model accurately simulated diurnal stem radius and water storage changes.
  • Stored water, primarily from needles and bark, contributed 10-65% of daily transpiration.
  • Crown water reserves supplied significantly more water to transpiration than stem reserves.

    • Conclusions:

    • Diurnal stem radius changes in trees are primarily driven by transpiration.
    • Internal water storage plays a vital role in tree water transport, not just during drought.
    • Needle and bark water reserves are critical for meeting daily transpiration demands.