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

Detalhes bibliográficos
Autor(a) principal: Santos, Francisco L.
Data de Publicação: 2016
Outros Autores: Correia, M. Manuela
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/19142
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. cv. ‘Arbequina’) with a well-watered (HI) control treatment A to supply 100 % of the crop water needs, and a moderately (MI) watered treatment B that replaced 70% of crop needs. To assure that treatment A was well-watered, we compared field daily ETc values against ETc obtained with the Penman-Monteith (PM) combination equation incorporating the Orgaz et al. (2007) bulk daily canopy conductance (gc) model, validated for our non-limiting conditions. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicator. 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 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 obtained as the ratio of actual to crop ETc, 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 ETc = Kcb(SAVI)Ks(ψ)ETo relationship stemmed 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 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 indexarbequinaalentejoWe used 2012 sap flow measurements to assess the seasonal dynamics of daily plant transpiration (ETc) in a high-density olive orchard (Olea europaea L. cv. ‘Arbequina’) with a well-watered (HI) control treatment A to supply 100 % of the crop water needs, and a moderately (MI) watered treatment B that replaced 70% of crop needs. To assure that treatment A was well-watered, we compared field daily ETc values against ETc obtained with the Penman-Monteith (PM) combination equation incorporating the Orgaz et al. (2007) bulk daily canopy conductance (gc) model, validated for our non-limiting conditions. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicator. 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 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 obtained as the ratio of actual to crop ETc, 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 ETc = Kcb(SAVI)Ks(ψ)ETo relationship stemmed 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 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.Institute for Adriatic Crops and Karst Put Duilova 11; p.p. 288; 21000 Split; Croatia, tel: +385.21.43.44.44; fax: +385.21.31.65.84; e-mail:office@krs.hr2016-11-17T17:56:04Z2016-11-172016-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/19142http://hdl.handle.net/10174/19142engnaonaonaofls@uevora.ptmmsc@uevora.pt580Santos, Francisco L.Correia, M. 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:RCAAP2024-01-03T19:07:59Zoai:dspace.uevora.pt:10174/19142Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:10:50.962199Repositório 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 L.
SAVI
stem water potential
sap flow
vegetation index
arbequina
alentejo
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 L.
author_facet Santos, Francisco L.
Correia, M. Manuela
author_role author
author2 Correia, M. Manuela
author2_role author
dc.contributor.author.fl_str_mv Santos, Francisco L.
Correia, M. Manuela
dc.subject.por.fl_str_mv SAVI
stem water potential
sap flow
vegetation index
arbequina
alentejo
topic SAVI
stem water potential
sap flow
vegetation index
arbequina
alentejo
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. cv. ‘Arbequina’) with a well-watered (HI) control treatment A to supply 100 % of the crop water needs, and a moderately (MI) watered treatment B that replaced 70% of crop needs. To assure that treatment A was well-watered, we compared field daily ETc values against ETc obtained with the Penman-Monteith (PM) combination equation incorporating the Orgaz et al. (2007) bulk daily canopy conductance (gc) model, validated for our non-limiting conditions. We then tested the hypothesis of indirectly monitoring olive ETc from readily available vegetation index (VI) and ground-based plant water stress indicator. 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 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 obtained as the ratio of actual to crop ETc, 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 ETc = Kcb(SAVI)Ks(ψ)ETo relationship stemmed 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 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 2016
dc.date.none.fl_str_mv 2016-11-17T17:56:04Z
2016-11-17
2016-10-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/19142
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url http://hdl.handle.net/10174/19142
dc.language.iso.fl_str_mv eng
language eng
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fls@uevora.pt
mmsc@uevora.pt
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dc.publisher.none.fl_str_mv Institute for Adriatic Crops and Karst Put Duilova 11; p.p. 288; 21000 Split; Croatia, tel: +385.21.43.44.44; fax: +385.21.31.65.84; e-mail:office@krs.hr
publisher.none.fl_str_mv Institute for Adriatic Crops and Karst Put Duilova 11; p.p. 288; 21000 Split; Croatia, tel: +385.21.43.44.44; fax: +385.21.31.65.84; e-mail:office@krs.hr
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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