Spectral Energy Relations of Isobilateral Leaves

Abstract

Reflectance and transmittance have b?en studied for eucalypts in the spectral range from 4000 to 9500 A at varying angles of incidence. Spectral reflectance and spectral transmittance were observed to be high in the infrared. All leaf surfaces were found to be highly diffusing and not to refect white light in accordance with the sine law. Transmittance of light in the visible spectrum through a single leaf was observed to be insignificant, and reflectivity in the infrared increased but slightly with mats in excess of four leaves. From the spectral data, absorptance values were calculated for single leaves of each species.