A Model of Plant Hydraulics Under Non-equilibrium Conditions

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Abstract
The hydraulic system in leaves was investigated in some detail and analysed in terms of an electrical transmission line analogy. The equivalent ‘circuit elements’ in the leaf were identified and their values calculated. The values of the ‘capacitative’ and ‘inductive’ terms were calculated for various leaf water potentials and for various changes in potential. They both exhibited considerable non-linearity. The calculated values were used to derive values for the ‘impedance’ of the pathways through the leaf xylem, and through the mesophyll cell walls, and to investigate the characteristics of these two pathways when oscillations, or fluctuations, in leaf water status were occurring.

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