Abstract
With appropriate modifications, Lettau's climatonomical theory (quantitative climatic description) may be applied to the characterization of vegetative influences on microclimate. The theory was tested on a sumac canopy which was alternately shaded and unshaded by the drift of cumulus cloud shadows. Results showed that the canopy layer had a relatively low thermal admittance, but the geometry of the canopy elements had a profound influence on the thermal properties of the layer. The observed thermal responses for the given meteorological conditions represent a single spectral distribution, characteristic of this particular canopy.
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