Journal article
A PRI-based water stress index combining structural and chlorophyll effects: Assessment using diurnal narrow-band airborne imagery and the CWSI thermal index
PJ Zarco-Tejada, V González-Dugo, LE Williams, L Suárez, JAJ Berni, D Goldhamer, E Fereres
Remote Sensing of Environment | ELSEVIER SCIENCE INC | Published : 2013
Abstract
This work advances the evaluation and interpretation of the Photochemical Reflectance Index (PRI) as an indicator of water stress, over a range of canopy structures and pigment content levels. Very high resolution (VHR) narrow-band multispectral (10cm) and thermal (20cm) imagery was acquired diurnally, in four airborne campaigns conducted over an experimental vineyard site undergoing three different irrigation treatments. Field measurements of leaf stomatal conductance (Gs) and leaf water potential (Ψleaf) were acquired concurrently with the airborne campaigns and compared against the Crop Water Stress Index (CWSI), a widely accepted, thermal-based indicator of water stress, and against narr..
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Awarded by Ministerio de Ciencia e Innovación
Funding Acknowledgements
Authors acknowledge D. Notario, A. Vera, M. Salinas, and the staff of the University of California, Davis (UCD) for their technical support. This work was funded by the Spanish Ministry of Science and Innovation, under the projects CONSOLIDER CSD2006-0067 and AGL2009-13105.