Journal Article

Absorption of Photosynthetically Active Radiation, Radiation Use Efficiency and Spectral Reflectance of Bracken [<i>Pteridium aquilinum</i> (L.) Kuhn] Canopies

John I. Pitman

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 85, issue suppl_2, pages 101-111
Published in print April 2000 | ISSN: 0305-7364
Published online April 2000 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/oxfordjournals.aob.a010317
Absorption of Photosynthetically Active Radiation, Radiation Use Efficiency and Spectral Reflectance of Bracken [Pteridium aquilinum (L.) Kuhn] Canopies

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  • Ecology and Conservation
  • Evolutionary Biology
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The seasonal development of a bracken canopy was measured over 7 years between 1980 and 1992. The object of the investigation was to relate the cumulative development of green above-ground biomass to cumulative absorbed photosynthetically active radiation (APAR). During the vegetative phase, APAR was described by an empirical expression (Monski and Saeki, Japanese Journal of Botany 14: 22–32, 1953) relating APAR to frond area, with a canopy extinction coefficient of 0·6. Values of above-ground biomass were linearly related to cumulative APAR, and the averaged radiation use efficiency (RUE) was 2·77 g MJ-1, although there was variation from year to year. For above-ground carbon biomass, the average RUE was found to be 1·24 g C MJ-1. The fraction of absorbed PAR fAPAR was also shown to be non-linearly related to, and predictable from, a simple spectral reflectance ratio, RVI, by the relationship fAPAR = 0·0472 (±0·0017)RVI. Remote sensing RVI during the period of vegetative growth, either from satellite corrected data or from field spectroscopy, and its conversion to APAR, will enable bracken biomass to be estimated directly and non-destructively using the RUE found here.

Keywords: Bracken growth; RUE; modelling; spectral reflectance; remote sensing; carbon content

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Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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