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A Tool For Detecting Crop Water Status Using Airborne High-resolution Thermal Imagery

AutorBellvert, Joaquim; Zarco-Tejada, Pablo J. ; Girona, Joan; González-Dugo, Victoria ; Fereres Castiel, Elías
Palabras claveRemote sensing
Leaf water potential
Crop water status
Crop water stress index
Fecha de publicación2014
EditorWIT Press
CitaciónWIT Transactions on Ecology and the Environment 185: 25-32 (2014)
ResumenKnowledge on crop water status at the orchard scale is necessary for the efficient management of irrigation water. Canopy temperature has long been recognized as a plant water status indicator, and crop water stress index (CWSI), which is obtained from canopy temperature could be used as a tool for remotely detecting plant water status from airborne high-resolution thermal imagery. In 2012, CWSI baselines for olive and peach trees were derived from infrared thermometer data. An aircraft equipped with a thermal sensor flew over two orchards acquiring high-resolution thermal images. At the same time, leaf water potential (ΨL) was measured in eighteen trees per specie. Relationship between the difference of canopy and air temperature (Tc-Ta) and ΨL had a R2 of 0.74 and 0.82, for peach and olive, respectively. CWSI ranged from zero to one and showed a significant correlation with ΨL. Maps of estimated ΨL (derived from CWSI - ΨL relationships) were able to detect the spatial variability of plant water status within the orchards, and may be a feasible tool for irrigation purposes.
Versión del editorhttp://doi.org/10.2495/SI140031
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