NDLI: Tracking photosynthetic efficiency with narrow-band spectroradiometry

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Tracking photosynthetic efficiency with narrow-band spectroradiometry

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gamon, John A. Field, Christopher B.
Copyright Year	1992
Description	Narrow-waveband spectroradiometry presents the possibility of detecting subtle signals closely related to the current physiological state of vegetation. One such signal related to the epoxidation state of the xanthophyll cycle pigments, violaxanthin, antheraxanthin, and zeaxanthin is discussed. Recent advances in plant ecophysiology demonstrated a close relationship between these pigments and the regulatory state of photosystem 2 in photosynthesis. Our recent field studies of sunflower (Helianthus annuus) and oak (Quercus agrifolia) demonstrated that a 'xanthophyll signal' can be isolated from the diurnal reflectance spectra of intact canopies. Furthermore, the xanthophyll signal can be used to derive a 'physiological reflectance index' (PRI) that closely correlates with the actual photosynthetic efficiency (defined as the photosynthetic rate divided by the incident PAR) in closed canopies. If these signals were detectable in Airborne Visible/Infrared Imaging Spectrometers (AVIRIS) images, they could lead to improved remote estimates of photosynthetic fluxes.
File Size	143046
Page Count	3
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940012225
Archival Resource Key	ark:/13960/t7fr4ss4m
Language	English
Publisher Date	1992-06-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Imaging Spectrometers Carotene Infrared Spectrometers Vegetation Epoxidation Photosynthesis Remote Sensing Sunflowers Spectral Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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