Plant canopy shape and the influences on UV exposures to the canopy
Article
Article Title | Plant canopy shape and the influences on UV exposures to the canopy |
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ERA Journal ID | 15283 |
Article Category | Article |
Authors | Parisi, A. V. (Author) and Wong, J. C. F. (Author) |
Journal Title | Photochemistry and Photobiology |
Journal Citation | 64 (1), pp. 143-148 |
Number of Pages | 6 |
Year | 1996 |
Publisher | John Wiley & Sons |
Place of Publication | Hoboken, NJ. United States |
ISSN | 0031-8655 |
1751-1097 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1751-1097.1996.tb02434.x |
Web Address (URL) | http://phot.allenpress.com/photonline/?request=get-current-issue |
Abstract | 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. |
Keywords | plant; canopy; UV; UVBE; spectrum; solar; irradiance |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
370106. Atmospheric radiation | |
511099. Synchrotrons and accelerators not elsewhere classified | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Centre for Astronomy, Solar Radiation and Climate |
Queensland University of Technology |
https://research.usq.edu.au/item/9xx00/plant-canopy-shape-and-the-influences-on-uv-exposures-to-the-canopy
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