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Related Experiment Videos

Relationships between embolism, stem water tension, and diameter changes.

T Hölttä1, T Vesala, M Perämäki

  • 1Department of Physical Sciences, University of Helsinki, FIN-00014, Finland.

Journal of Theoretical Biology
|June 8, 2002
PubMed
Summary

This study models embolism in tree sap flow as a physical process. Embolism impacts tree water relations and diurnal diameter changes by decreasing sap flow permeability.

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Area of Science:

  • Plant physiology
  • Biophysics

Background:

  • Cavitation, or embolism, is a critical process affecting plant water transport.
  • Understanding embolism mechanisms is vital for plant water relations and survival.

Purpose of the Study:

  • To develop a physical model of embolism in sap flow.
  • To examine the effects of different embolism mechanisms on tree water relations and diurnal diameter changes.

Main Methods:

  • Modeled embolism as a physical process considering conduit properties and water thermodynamics.
  • Investigated heterogeneous nucleation, air-seeding, and bubble growth mechanisms.
  • Analyzed diurnal diameter changes as a measurable indicator of embolism.

Main Results:

  • Embolism reduces sap flow permeability and releases water, impacting water transport.

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  • Diurnal diameter changes can indirectly detect embolism effects.
  • Embolism generally increases diurnal diameter change amplitude unless elasticity is reduced.

    • Conclusions:

    • The physical model provides insights into embolism's role in sap flow.
    • Diameter changes are a valuable field metric for assessing embolism.
    • Embolism's impact on tree hydraulics is complex and depends on elasticity.