Seasonal dynamics and operational monitoring of hedgerow olive tree transpiration in response to applied water
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | |
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. |
id |
RCAP_9901ee58236fb050938cd3d4d3b9f845 |
---|---|
oai_identifier_str |
oai:dspace.uevora.pt:10174/23532 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
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 |
|
_version_ |
1799136624466984960 |