Plant canopy shape and the influences on UV exposures to the canopy

Parisi, A. V. and Wong, J. C. F. (1996) Plant canopy shape and the influences on UV exposures to the canopy. Photochemistry and Photobiology, 64 (1). pp. 143-148. ISSN 0031-8655

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The solar spectra at selected sites over hemispherical, conical and pinnacle plant canopy models has been evaluated with a dosimetric technique. The irradiance at the sites varies by up to a factor of 0.31 compared to the irradiance on a horizontal plane. The biologically effective (UVBE) exposures evaluated with the dosimetric technique at sites over the plant canopy are up to 19% of that on a horizontal plane. Compared to a spectroradiometer, the technique provides a more practicable method of measuring the UVBE exposures at multiple sites over a plant canopy. Usage of a dosimeter at one site to provide the exposures at that site for different sun angles introduces an error of more than 50%. Knowledge of the spectra allowed the UV and UVBE exposures to be calculated at each site along with the exposures to the entire canopies. These were dependent on the sun angle and the canopy shape. For plant damage, the UVBE was a maximum of about 1.4 mJ cm-2/min. Compared to the hemispherical canopy, the UVBE exposure for generalised plant damage was 45% less for the pinnacle canopy and 23% less for the conical canopy. The canopy exposures could not be determined from measurements of the ambient exposure.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version deposited according to Publisher's requirements.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:39
Last Modified: 27 Sep 2016 04:42
Uncontrolled Keywords: plant; canopy; UV; UVBE; spectrum; solar; irradiance
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1111/j.1751-1097.1996.tb02434.x

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