Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region

Detalhes bibliográficos
Autor(a) principal: Rodrigues, P.
Data de Publicação: 2010
Outros Autores: Pedroso, V., Gouveia, J.P., Martins, S., Lopes, C.M., Alves, I.
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10400.5/5508
Resumo: Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011
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spelling Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão regiongrapevinecanopyradiative surface temperaturetranspirationProceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011In order to validate a model of vine transpiration based on radiative surface temperature a field trial was conducted in a vineyard in the Dão region, centre of Portugal, with the cultivar “Touriga Nacional”. The model is based on the partition of net radiation between the components of the canopy (vines, soil, and grass cover), considering that the vines and the undercover (soil plus grass cover) act separately and in parallel. Thus, the latent heat flux from the vines to the atmosphere (lTc) is determined from vine net radiation (Rnc) and sensible heat flux (Hc). The partition of net radiation (Rn) between the undercover (Rns) and the vines (Rnc) is made considering the exponential form for radiation extinction, with the coefficient of extinction being corrected with a factor dependent on the zenital solar angle (j) while leaf area index (LAI) is corrected with a clumping factor, Ω(φ). Sensible heat flux from the vines (Hc) is calculated from radiative temperature (Tc) considering that the fluxes from the different origins are independent and that there are two resistances in series between the canopy and the atmosphere: the leaf boundary layer resistance (raHc) and the aerodynamic resistance of the crop (raH). Besides the estimation of the daily values of transpiration, the model allows to study the evolution of the different components of the radiation balance throughout the day. The daily evolution of the evaporation fraction from the vines (FEc) can be approximated by a concave curve. Values of FEc > 1 show that, under certain circumstances and periods of the day, energy used for transpiration (lTc) is greater than crop net radiation, which indicates that there are exchanges of energy between the several components of the surface, namely when evaporative demand from the atmosphere is high and there are no soil water restrictions. The model also shows that, regardless of the soil water status, transpiration is a big part of Rn when these values are low (in the beginning of the morning and late afternoon).Repositório da Universidade de LisboaRodrigues, P.Pedroso, V.Gouveia, J.P.Martins, S.Lopes, C.M.Alves, I.2013-05-22T15:17:30Z20102010-01-01T00:00:00Zconference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10400.5/5508enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T16:01:26Zoai:repositorio.ulisboa.pt:10400.5/5508Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T04:00:14.482733Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
title Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
spellingShingle Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
Rodrigues, P.
grapevine
canopy
radiative surface temperature
transpiration
title_short Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
title_full Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
title_fullStr Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
title_full_unstemmed Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
title_sort Daily evolution of the components of the balance of radiation of vines in a vineyard in the Dão region
author Rodrigues, P.
author_facet Rodrigues, P.
Pedroso, V.
Gouveia, J.P.
Martins, S.
Lopes, C.M.
Alves, I.
author_role author
author2 Pedroso, V.
Gouveia, J.P.
Martins, S.
Lopes, C.M.
Alves, I.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Rodrigues, P.
Pedroso, V.
Gouveia, J.P.
Martins, S.
Lopes, C.M.
Alves, I.
dc.subject.por.fl_str_mv grapevine
canopy
radiative surface temperature
transpiration
topic grapevine
canopy
radiative surface temperature
transpiration
description Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01T00:00:00Z
2013-05-22T15:17:30Z
dc.type.driver.fl_str_mv conference object
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/5508
url http://hdl.handle.net/10400.5/5508
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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