Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water

Detalhes bibliográficos
Autor(a) principal: Santos, Francisco
Data de Publicação: 2018
Outros Autores: Correia, Manuela
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/23532
https://doi.org/doi.org/10.17660/ActaHortic.2018.1199.56
Resumo: We used 2012 sap-flow measurements to assess the seasonal dynamics of daily plant transpiration (ETc) in a high-density olive orchard (Olea europaea L. ‘Arbequina’) with a well-watered (HI) control treatment A, to supply 100% of the crop water needs, and a moderately watered (MI) treatment B, which replaced 70% of crop needs. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicators. In the process, we used the FAO56 dual crop coefficient (Kc) approach. For the HI olive trees, we defined Kcb as the basal transpiration coefficient, and we related Kcb to the remotely sensed soil-adjusted vegetation index (SAVI) through a Kcb-SAVI functional relationship. For the MI treatment, we defined the actual transpiration ETc as the product of Kcb and the stress reduction coefficient Ks, and we correlated Ks with MI midday stem water potential (ψst) values through a Ks-ψ functional relationship. Operational monitoring of ETc was then implemented with the relationship ETc = Kcb(SAVI) × Ks(ψ) × ET0 derived from the FAO56 approach and validated, taking as inputs collected SAVI and ψst data reporting to year 2011. Low validation error (6%) and high goodness-of-fit of prediction were observed (R2=0.94, RSME=0.2 mm day-1, P=0.0015), allowing us to consider that, under field conditions, it is possible to predict ETc values for our hedgerow olive orchards if SAVI and water potential (ψst) values are known.
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spelling Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied waterSAVIStem water potentialsap flowvegetation indexWe used 2012 sap-flow measurements to assess the seasonal dynamics of daily plant transpiration (ETc) in a high-density olive orchard (Olea europaea L. ‘Arbequina’) with a well-watered (HI) control treatment A, to supply 100% of the crop water needs, and a moderately watered (MI) treatment B, which replaced 70% of crop needs. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicators. In the process, we used the FAO56 dual crop coefficient (Kc) approach. For the HI olive trees, we defined Kcb as the basal transpiration coefficient, and we related Kcb to the remotely sensed soil-adjusted vegetation index (SAVI) through a Kcb-SAVI functional relationship. For the MI treatment, we defined the actual transpiration ETc as the product of Kcb and the stress reduction coefficient Ks, and we correlated Ks with MI midday stem water potential (ψst) values through a Ks-ψ functional relationship. Operational monitoring of ETc was then implemented with the relationship ETc = Kcb(SAVI) × Ks(ψ) × ET0 derived from the FAO56 approach and validated, taking as inputs collected SAVI and ψst data reporting to year 2011. Low validation error (6%) and high goodness-of-fit of prediction were observed (R2=0.94, RSME=0.2 mm day-1, P=0.0015), allowing us to consider that, under field conditions, it is possible to predict ETc values for our hedgerow olive orchards if SAVI and water potential (ψst) values are known.Acta Horticulturae2018-10-04T14:25:31Z2018-10-042018-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/23532http://hdl.handle.net/10174/23532https://doi.org/doi.org/10.17660/ActaHortic.2018.1199.56engSantos, F.L. and Correia, M.M. (2018). Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water. Acta Hortic. 1199, 357-362fls@uevora.ptmmsc@uevora.pt214Santos, FranciscoCorreia, Manuelainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:15:37Zoai:dspace.uevora.pt:10174/23532Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:14:18.279405Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
title Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
spellingShingle Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
Santos, Francisco
SAVI
Stem water potential
sap flow
vegetation index
title_short Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
title_full Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
title_fullStr Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
title_full_unstemmed Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
title_sort Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
author Santos, Francisco
author_facet Santos, Francisco
Correia, Manuela
author_role author
author2 Correia, Manuela
author2_role author
dc.contributor.author.fl_str_mv Santos, Francisco
Correia, Manuela
dc.subject.por.fl_str_mv SAVI
Stem water potential
sap flow
vegetation index
topic SAVI
Stem water potential
sap flow
vegetation index
description We used 2012 sap-flow measurements to assess the seasonal dynamics of daily plant transpiration (ETc) in a high-density olive orchard (Olea europaea L. ‘Arbequina’) with a well-watered (HI) control treatment A, to supply 100% of the crop water needs, and a moderately watered (MI) treatment B, which replaced 70% of crop needs. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicators. In the process, we used the FAO56 dual crop coefficient (Kc) approach. For the HI olive trees, we defined Kcb as the basal transpiration coefficient, and we related Kcb to the remotely sensed soil-adjusted vegetation index (SAVI) through a Kcb-SAVI functional relationship. For the MI treatment, we defined the actual transpiration ETc as the product of Kcb and the stress reduction coefficient Ks, and we correlated Ks with MI midday stem water potential (ψst) values through a Ks-ψ functional relationship. Operational monitoring of ETc was then implemented with the relationship ETc = Kcb(SAVI) × Ks(ψ) × ET0 derived from the FAO56 approach and validated, taking as inputs collected SAVI and ψst data reporting to year 2011. Low validation error (6%) and high goodness-of-fit of prediction were observed (R2=0.94, RSME=0.2 mm day-1, P=0.0015), allowing us to consider that, under field conditions, it is possible to predict ETc values for our hedgerow olive orchards if SAVI and water potential (ψst) values are known.
publishDate 2018
dc.date.none.fl_str_mv 2018-10-04T14:25:31Z
2018-10-04
2018-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/23532
http://hdl.handle.net/10174/23532
https://doi.org/doi.org/10.17660/ActaHortic.2018.1199.56
url http://hdl.handle.net/10174/23532
https://doi.org/doi.org/10.17660/ActaHortic.2018.1199.56
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Santos, F.L. and Correia, M.M. (2018). Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water. Acta Hortic. 1199, 357-362
fls@uevora.pt
mmsc@uevora.pt
214
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Acta Horticulturae
publisher.none.fl_str_mv Acta Horticulturae
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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