Abstract
A model for the prediction of interception loss in pine canopies is described. Central to the model is the storage of water on the canopy. This store is added to by intercepted rainfall and depleted by evaporation and drainage. Since the rates of evaporation and drainage vary with the amount of water on the canopy, the model is constructed to calculate a running balance in time of rainfall, throughfall, evaporation and changes in canopy storage. Evaporation from the wet canopy constitutes the interception loss. Methods of deriving the relevant parameters of the canopy are discussed. In addition, standard meteorological data, recorded if possible at hourly intervals, are required. Calculations made by the model agreed satisfactorily with observed monthly interception losses in a stand of Corsican pine, for a period of 18 months.
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