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Experimental Tests of the Light-Use Efficiency Model in Alfalfa Open Access


Other title
Photochemically Reflectance Index
Eddy Covariance
Ecosystem Productivity
Sensor Comparison
Light-Use Efficiency
Temporal Aggregation
Type of item
Degree grantor
University of Alberta
Author or creator
Castro, Saulo M
Supervisor and department
Gamon, John (Earth and Atmospheric Science)
Examining committee member and department
Wolfe, Alexander (Earth and Atmospheric Science)
Flanagan, Lawrence (Biological Sciences, University of Lethbridge)
Department of Earth and Atmospheric Sciences

Date accepted
Graduation date
Master of Science
Degree level
This study explored ways of integrating optical and flux measurements in the context of the Light Use Efficiency (LUE) model in an alfalfa (Medicago sativa) field. Narrow-band spectrometers and low cost two-band radiometers provided alternate ways to measure NDVI and estimate the APAR term of the LUE model. The high temporal resolution of two-band sensors system accurately tracked seasonal carbon flux dynamics (R2 = 0.96) demonstrating the value of automated, low cost approaches to monitoring NDVI and canopy light absorption, which was the dominant term in the LUE model for this agricultural field. At the seasonal scale PRI correlations with LUE varied with the LUE formulation, and suggested that seasonal PRI patterns were primarily driven by canopy structure changes. However, at the diurnal level, ∆PRI correlated with changing efficiency. Combined optical and flux sampling can help partition flux data, gap-fill data, and add insights into the controls of carbon fluxes.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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