Dt

l2 T

where the flux qh1 defined by Eq. (2.4) is the specific (per unit area) heat flux, the factor DT/11 =(T — Ti)/l1 is the temperature gradient, Ti and T are the temperatures of the leaf interior and the environment (atmosphere). The second item is

ACw 1

where the specific flux qw is defined by Eq. (2.3), and yw is the specific enthalpy of water vapour; the factor DCw/Cwl2 = [Cw — Csw(T)]/Cwl2 is the gradient of its potential, Dmw / l2, at temperature T. The third item

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