Abstract
A modelling technique for penetration of solar radiation into clumped vegetation canopies is described. It combines Monte-Carlo simulation to determine ray pathlengths through individual plant canopy envelopes with exponential attenuation along these rays. The technique is applied to a hillside forest of randomly located and sized jack pine trees. Scattering effects are incorporated and the model output is compared with field measurements. The results depend on the shape of the tree outline. Attenuation is less rapid with downward cumulative leaf area index than in a randomly dispersed canopy.
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