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    Author(s): Richard H. Grant; Gordon M. Heisler; Wei Gao; Matthew Jenks
    Date: 2003
    Source: Agricultural and Forest Meteorology. 120: 127-139
    Publication Series: Miscellaneous Publication
    Station: Northeastern Research Station
    PDF: View PDF  (3.04 MB)

    Description

    The spectral reflectance and transmittance over the wavelength range of 250-700nm were evaluated for leaves of 20 deciduous tree species and leaf sheaths of five isogenic wax variants of Sorghum bicolor differing in visible reflectance due to cuticular waxes. Using the sorghum sheath reflectance and cuticle surface characteristics as a model, it was concluded that tree leaf reflectance above 0.06 was likely due to the presence of variously-shaped fine epicuticular wax structures on the leaf surface. Increasing the density of sub-micron wax structures corresponded to an enhanced ultraviolet (UV) reflectance over the PAR reflectance of a given leaf surface-either S. bicolor sheath or tree leaf. Amorphous globular epicuticular wax structures did not appear to scatter UV as well as wax filaments or vertical plates in varying patterns even when the dimensions of the structures were similar. Further work is needed to clarify this relationship and the influence of cellular pigments on subsurface contributions to the reflectance.

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    Citation

    Grant, Richard H.; Heisler, Gordon M.; Gao, Wei; Jenks, Matthew. 2003. Ultraviolet leaf reflectance of common urban trees and the prediction of reflectance from leaf surface characteristics. Agricultural and Forest Meteorology. 120: 127-139

    Keywords

    UV, sorghum, reflectivity, deciduous forest, radiation

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