The evaporation of deep crops such as forests is usually considered in terms of the two-resistance Penman-Monteith model, though this conflates two of the three resistances actually involved, i.e. the canopy resistancercbetween the transpiring leaves and the top of the canopy, and the resistancersdue to the stomates of the leaves. A review of the literature on these and the aerodynamic resistancera(between the crop and the atmosphere) shows how distinctly different they are, and therefore how inappropriate it is to lump any two together.
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