Abstract
Measurements have been made of the four canopy parameters required by Rutter type interception models for heather ( Calluna vulgaris). The values obtained are 5.13 and 0.00085 for the drainage parameters b and k, respectively, (0.13 ± 0.09) for the free throughfall coefficient p, and values of 1.1 ± 0.1 and 0.85 ± 0.1 mm for the canopy capacity S, derived from independent drainage and evaporation experiments, respectively. It is suggested that the difference between the two values of S is significant and represents a real difference between the canopy storage at which drainage ceases and the smaller canopy storage necessary for a completely wet canopy. Studies of the wetting behaviour of heather provide evidence to support this hypothesis.
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