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Updated: Jun 4, 2025

Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
Trees suck. Notes on the physics of transpiration in trees
Harvey R Brown1, Adrian P Sutton1
1Faculty of Philosophy, University of Oxford, Radcliffe Observatory Quarter 555 Woodstock Road, Oxford OX2 6GG, UK; Faculty of Natural Sciences, Department of Physics Imperial College London, Exhibition Road, London SW7 2AZ, UK.
The Cohesion Theory explains water transport in trees, integrating hydrodynamics with complex physics like capillarity and osmosis. This paper clarifies these phenomena for plant science.
Area of Science:
- Plant Physiology
- Biophysics
Background:
- The ascent of water in trees is explained by the Cohesion Theory.
- Transpiration involves hydrodynamics, capillarity, evaporation, and osmosis.
- These physical phenomena have historically presented theoretical challenges.
Purpose of the Study:
- To supplement existing plant science literature on the physics of water ascent.
- To clarify the theoretical underpinnings of transpiration in trees.
Main Methods:
- Review and synthesis of existing theoretical frameworks.
- Explanation of physical principles governing water transport.
Main Results:
- Provides a clearer understanding of the physics of transpiration.
- Integrates hydrodynamics with capillarity, evaporation, and osmosis.
Conclusions:
- The Cohesion Theory is a robust explanation for water transport.
- Further clarification of underlying physics aids plant science research.
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