Assessing the coffee canopy light absortion based on the leaf area

Detalhes bibliográficos
Autor(a) principal: Pilau, Felipe Gustavo
Data de Publicação: 2016
Outros Autores: Angelocci, Luiz Roberto
Tipo de documento: Artigo
Idioma: por
Título da fonte: Coffee Science (Online)
Texto Completo: https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016
Resumo: The study evaluated solar radiation interception patterns (K*) defining the relations of interception efficiency (εint) and extinction coefficient (k) of coffee trees (cv. Obatã IAC 1669-20) under leaf area changes. Aiming to determine these interactions for coffee plants (3 years old) under manual defoliations, solar radiation transmitted was measured with two tube solarimeters placed at ground level below the crowns. A canopy-light interception model was derived using the extinction coefficient approach (Monsi & Saeki theory) to assess with independent data to estimate K*. Under absence of leaves, an intense interference of leaves supporting structures over εint was observed, with a minimum value of 0.34. The results were also distinct for obtaining k. The derived model well simulated the K* against measurements, with Willmott index as high as 0.92, improving modeling accuracy using ‘k’ from quadratic fit.
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spelling Assessing the coffee canopy light absortion based on the leaf areaPadrões de interceptação de radiação solar por cafeeiros em função da área foliarCoffea arabica L.leaf area indexinterception efficiencyextinction coefficientCoffea arabica L.índice de área foliareficiência de interceptaçãocoeficiente de extinçãoThe study evaluated solar radiation interception patterns (K*) defining the relations of interception efficiency (εint) and extinction coefficient (k) of coffee trees (cv. Obatã IAC 1669-20) under leaf area changes. Aiming to determine these interactions for coffee plants (3 years old) under manual defoliations, solar radiation transmitted was measured with two tube solarimeters placed at ground level below the crowns. A canopy-light interception model was derived using the extinction coefficient approach (Monsi & Saeki theory) to assess with independent data to estimate K*. Under absence of leaves, an intense interference of leaves supporting structures over εint was observed, with a minimum value of 0.34. The results were also distinct for obtaining k. The derived model well simulated the K* against measurements, with Willmott index as high as 0.92, improving modeling accuracy using ‘k’ from quadratic fit.Objetivou-se, no presente trabalho, avaliar alterações nos padrões de interceptação de radiação solar pela copa de cafeeiros, em consequência da variação do índice de área foliar por desfolhas, determinando-se relações da eficiência de interceptação e do coeficiente de extinção da radiação da copa, com a variação de área foliar. Adicionalmente, estimar a radiação solar interceptada pelos cafeeiros e comparar a valores medidos por radiometria. O mesmo modelo teórico usado para determinar o coeficiente de extinção ‘k’ (Teoria de Monsi & Saeki) foi usado, também, para a estimativa da radiação solar interceptada (K*). Os dados revelaram uma clara interferência das estruturas de sustentação das folhas, sobre a eficiência de interceptação da radiação solar (εint), com valor mínimo de 0,34 com ausência completa de folhas. Os resultados também foram distintos, em relação à obtenção do coeficiente de extinção ‘k’, mais uma vez com influência do tronco e ramos plagiotrópicos. As simulações de K* confrontadas às medições apresentaram boa correlação, tanto na escala de 15 min, como diária. Conforme o índice de Willmott (d), o uso do coeficiente k obtido por ajuste quadrático tornou as estimativas mais exatas.Editora UFLA2016-03-22info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/ziphttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016Coffee Science - ISSN 1984-3909; Vol. 11 No. 1 (2016); 127 - 136Coffee Science; Vol. 11 Núm. 1 (2016); 127 - 136Coffee Science; v. 11 n. 1 (2016); 127 - 1361984-3909reponame:Coffee Science (Online)instname:Universidade Federal de Lavras (UFLA)instacron:UFLAporhttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016/pdf_14https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016/1541Copyright (c) 2016 Coffee Science - ISSN 1984-3909https://creativecommons.org/info:eu-repo/semantics/openAccessPilau, Felipe GustavoAngelocci, Luiz Roberto2016-03-23T02:36:31Zoai:coffeescience.ufla.br:article/1016Revistahttps://coffeescience.ufla.br/index.php/CoffeesciencePUBhttps://coffeescience.ufla.br/index.php/Coffeescience/oaicoffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com1984-39091809-6875opendoar:2024-05-21T19:53:55.172762Coffee Science (Online) - Universidade Federal de Lavras (UFLA)true
dc.title.none.fl_str_mv Assessing the coffee canopy light absortion based on the leaf area
Padrões de interceptação de radiação solar por cafeeiros em função da área foliar
title Assessing the coffee canopy light absortion based on the leaf area
spellingShingle Assessing the coffee canopy light absortion based on the leaf area
Pilau, Felipe Gustavo
Coffea arabica L.
leaf area index
interception efficiency
extinction coefficient
Coffea arabica L.
índice de área foliar
eficiência de interceptação
coeficiente de extinção
title_short Assessing the coffee canopy light absortion based on the leaf area
title_full Assessing the coffee canopy light absortion based on the leaf area
title_fullStr Assessing the coffee canopy light absortion based on the leaf area
title_full_unstemmed Assessing the coffee canopy light absortion based on the leaf area
title_sort Assessing the coffee canopy light absortion based on the leaf area
author Pilau, Felipe Gustavo
author_facet Pilau, Felipe Gustavo
Angelocci, Luiz Roberto
author_role author
author2 Angelocci, Luiz Roberto
author2_role author
dc.contributor.author.fl_str_mv Pilau, Felipe Gustavo
Angelocci, Luiz Roberto
dc.subject.por.fl_str_mv Coffea arabica L.
leaf area index
interception efficiency
extinction coefficient
Coffea arabica L.
índice de área foliar
eficiência de interceptação
coeficiente de extinção
topic Coffea arabica L.
leaf area index
interception efficiency
extinction coefficient
Coffea arabica L.
índice de área foliar
eficiência de interceptação
coeficiente de extinção
description The study evaluated solar radiation interception patterns (K*) defining the relations of interception efficiency (εint) and extinction coefficient (k) of coffee trees (cv. Obatã IAC 1669-20) under leaf area changes. Aiming to determine these interactions for coffee plants (3 years old) under manual defoliations, solar radiation transmitted was measured with two tube solarimeters placed at ground level below the crowns. A canopy-light interception model was derived using the extinction coefficient approach (Monsi & Saeki theory) to assess with independent data to estimate K*. Under absence of leaves, an intense interference of leaves supporting structures over εint was observed, with a minimum value of 0.34. The results were also distinct for obtaining k. The derived model well simulated the K* against measurements, with Willmott index as high as 0.92, improving modeling accuracy using ‘k’ from quadratic fit.
publishDate 2016
dc.date.none.fl_str_mv 2016-03-22
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016
url https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016/pdf_14
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/1016/1541
dc.rights.driver.fl_str_mv Copyright (c) 2016 Coffee Science - ISSN 1984-3909
https://creativecommons.org/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2016 Coffee Science - ISSN 1984-3909
https://creativecommons.org/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/zip
dc.publisher.none.fl_str_mv Editora UFLA
publisher.none.fl_str_mv Editora UFLA
dc.source.none.fl_str_mv Coffee Science - ISSN 1984-3909; Vol. 11 No. 1 (2016); 127 - 136
Coffee Science; Vol. 11 Núm. 1 (2016); 127 - 136
Coffee Science; v. 11 n. 1 (2016); 127 - 136
1984-3909
reponame:Coffee Science (Online)
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Coffee Science (Online)
collection Coffee Science (Online)
repository.name.fl_str_mv Coffee Science (Online) - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv coffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com
_version_ 1799874920429125632

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