Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients

Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients

The vegetation index (VI)-reference evapotranspiration (ETo) method incorporates the estimation of basal crop coefficients from spectral VIs into the FAO56 guidelines for computing crop evapotranspiration (ET). Previous research pointed to the possibility of the differential spectral response of some Mediterranean crops, specifically olive trees. To evaluate this hypothesis and the potential related effects on the VI-ETo method, this work studied the spectral response of four Mediterranean canopies under full vegetation coverage: three fruit trees (olive, orange and almond trees), and the holm oak trees of the dehesa ecosystem. Spectral measurements were taken on dense vegetation placed on a workbench and over dense treetops, avoiding in both cases the effect of soil background. The results showed that the soil adjusted vegetation index (SAVI) for full-cover olive trees was significantly lower than for other fruit trees (0.57 for olive trees vs. 0.71 for orange tree and 0.70 for almond tree). SAVI of olive vegetation measured on the workbench was lower than that measured over treetops, probably due to the effects of canopy architecture and shadowing. SAVI obtained on oak treetops (0.51) was even lower than that on olive treetops. This differential spectral response of olive and oak trees influenced the estimation of ET (and water stress). The validation using ET measurements obtained with the eddy covariance method in the olive orchards showed a reduction of root mean square deviation (RMSD) from 0.73 to 0.6 mm day−1 when daily ET was estimated assuming SAVImax = 0.57 in comparison with a generic value for Mediterranean crops.

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Bibliographic Details
Main Authors: Carpintero, E., Mateos, Luciano, Andreu, A., González-Dugo, María P.
Other Authors: Ministerio de Educación, Cultura y Deporte (España)
Format: artículo biblioteca
Published: Elsevier 2020-08-01
Subjects:Vegetation indices, Full vegetation coverage, Evapotranspiration, Crop coefficients, VI-ETo method, Mediterranean tree canopies,
Online Access:http://hdl.handle.net/10261/227224
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003176
http://dx.doi.org/10.13039/501100011011
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spelling dig-ias-es-10261-2272242022-08-12T04:31:58Z Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients Carpintero, E. Mateos, Luciano Andreu, A. González-Dugo, María P. Ministerio de Educación, Cultura y Deporte (España) European Commission Junta de Andalucía Vegetation indices Full vegetation coverage Evapotranspiration Crop coefficients VI-ETo method Mediterranean tree canopies The vegetation index (VI)-reference evapotranspiration (ETo) method incorporates the estimation of basal crop coefficients from spectral VIs into the FAO56 guidelines for computing crop evapotranspiration (ET). Previous research pointed to the possibility of the differential spectral response of some Mediterranean crops, specifically olive trees. To evaluate this hypothesis and the potential related effects on the VI-ETo method, this work studied the spectral response of four Mediterranean canopies under full vegetation coverage: three fruit trees (olive, orange and almond trees), and the holm oak trees of the dehesa ecosystem. Spectral measurements were taken on dense vegetation placed on a workbench and over dense treetops, avoiding in both cases the effect of soil background. The results showed that the soil adjusted vegetation index (SAVI) for full-cover olive trees was significantly lower than for other fruit trees (0.57 for olive trees vs. 0.71 for orange tree and 0.70 for almond tree). SAVI of olive vegetation measured on the workbench was lower than that measured over treetops, probably due to the effects of canopy architecture and shadowing. SAVI obtained on oak treetops (0.51) was even lower than that on olive treetops. This differential spectral response of olive and oak trees influenced the estimation of ET (and water stress). The validation using ET measurements obtained with the eddy covariance method in the olive orchards showed a reduction of root mean square deviation (RMSD) from 0.73 to 0.6 mm day−1 when daily ET was estimated assuming SAVImax = 0.57 in comparison with a generic value for Mediterranean crops. The authors would like to acknowledge funding supplied by the FPU subprogram - Ministerio de Educación, Cultura y Deporte - Gobierno de España. Additional support was provided by the project LIFE AGROgestor (LIFE16ENV/ES/287) and SensDehesa (PP.PEI.IDF201601.16), co-funded at 80% by the European Regional Development Fund (ERDF), as part of the Andalusian operational programme2014-2020. Dr. Andreu work has been funded by the European Union’s Horizon 2020 Research and Innovation programme under the Marie Skłodowska-Curie grant agreement No703978. 2021-01-21T11:30:03Z 2021-01-21T11:30:03Z 2020-08-01 2021-01-21T11:30:04Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.agwat.2020.106201 issn: 0378-3774 Agricultural Water Management 238: 106201 (2020) http://hdl.handle.net/10261/227224 10.1016/j.agwat.2020.106201 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100003176 http://dx.doi.org/10.13039/501100011011 #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/H2020/703978 Postprint http://doi.org/10.1016/j.agwat.2020.106201 Sí open Elsevier
institution IAS ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-ias-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IAS España
topic Vegetation indices
Full vegetation coverage
Evapotranspiration
Crop coefficients
VI-ETo method
Mediterranean tree canopies
Vegetation indices
Full vegetation coverage
Evapotranspiration
Crop coefficients
VI-ETo method
Mediterranean tree canopies
spellingShingle Vegetation indices
Full vegetation coverage
Evapotranspiration
Crop coefficients
VI-ETo method
Mediterranean tree canopies
Vegetation indices
Full vegetation coverage
Evapotranspiration
Crop coefficients
VI-ETo method
Mediterranean tree canopies
Carpintero, E.
Mateos, Luciano
Andreu, A.
González-Dugo, María P.
Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
description The vegetation index (VI)-reference evapotranspiration (ETo) method incorporates the estimation of basal crop coefficients from spectral VIs into the FAO56 guidelines for computing crop evapotranspiration (ET). Previous research pointed to the possibility of the differential spectral response of some Mediterranean crops, specifically olive trees. To evaluate this hypothesis and the potential related effects on the VI-ETo method, this work studied the spectral response of four Mediterranean canopies under full vegetation coverage: three fruit trees (olive, orange and almond trees), and the holm oak trees of the dehesa ecosystem. Spectral measurements were taken on dense vegetation placed on a workbench and over dense treetops, avoiding in both cases the effect of soil background. The results showed that the soil adjusted vegetation index (SAVI) for full-cover olive trees was significantly lower than for other fruit trees (0.57 for olive trees vs. 0.71 for orange tree and 0.70 for almond tree). SAVI of olive vegetation measured on the workbench was lower than that measured over treetops, probably due to the effects of canopy architecture and shadowing. SAVI obtained on oak treetops (0.51) was even lower than that on olive treetops. This differential spectral response of olive and oak trees influenced the estimation of ET (and water stress). The validation using ET measurements obtained with the eddy covariance method in the olive orchards showed a reduction of root mean square deviation (RMSD) from 0.73 to 0.6 mm day−1 when daily ET was estimated assuming SAVImax = 0.57 in comparison with a generic value for Mediterranean crops.
author2 Ministerio de Educación, Cultura y Deporte (España)
author_facet Ministerio de Educación, Cultura y Deporte (España)
Carpintero, E.
Mateos, Luciano
Andreu, A.
González-Dugo, María P.
format artículo
topic_facet Vegetation indices
Full vegetation coverage
Evapotranspiration
Crop coefficients
VI-ETo method
Mediterranean tree canopies
author Carpintero, E.
Mateos, Luciano
Andreu, A.
González-Dugo, María P.
author_sort Carpintero, E.
title Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
title_short Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
title_full Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
title_fullStr Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
title_full_unstemmed Effect of the differences in spectral response of Mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
title_sort effect of the differences in spectral response of mediterranean tree canopies on the estimation of evapotranspiration using vegetation index-based crop coefficients
publisher Elsevier
publishDate 2020-08-01
url http://hdl.handle.net/10261/227224
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003176
http://dx.doi.org/10.13039/501100011011
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AT mateosluciano effectofthedifferencesinspectralresponseofmediterraneantreecanopiesontheestimationofevapotranspirationusingvegetationindexbasedcropcoefficients
AT andreua effectofthedifferencesinspectralresponseofmediterraneantreecanopiesontheestimationofevapotranspirationusingvegetationindexbasedcropcoefficients
AT gonzalezdugomariap effectofthedifferencesinspectralresponseofmediterraneantreecanopiesontheestimationofevapotranspirationusingvegetationindexbasedcropcoefficients
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