Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia

Detalhes bibliográficos
Autor(a) principal: Paulino Junior,Narciso
Data de Publicação: 2017
Outros Autores: von Randow,Rita de Cássia Silva, von Randow,Celso
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Ambiente & Água
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2017000200179
Resumo: Abstract This work studied the behavior and seasonality of evapotranspiration influenced by biotic and abiotic factors through analysis of diurnal variation of aerodynamic resistance (ra), stomatal resistance (rs) and decoupling factor (Ω). This index was proposed by Jarvis and McNaughton (1986) as an indicative of the control of these resistances on the evapotranspiration of vegetation. Selection of representative data from wet and dry seasons from a primary forest in Central Amazonia and a primary forest and a pasture sites in Southwestern Amazonia had shown that: (i) rais about 20 s.m-1in both forests in both seasons, and ranges from 70 to 100 s.m-1in the pasture site; (ii) rsvaries both throughout the day and seasonally, with medians increasing from 40 in the morning, to 150 s.m-1in late afternoon, in the wet season in the forests and from 50 to 160 s.m-1in the pasture. These values increase in the dry season, with the forests rsranging from 50 up to 500 s.m-1and pasture rsstarting from 140 s.m-1and reaching up to more than 1800 s.m-1in the dry afternoons; (iii) Ω ranges from 0.5 to 0.8 during the wet season, and reduces to values below 0.5 in the afternoons during the dry season, indicating that, although a strong influence of net radiation in the evaporative loss is present, to a large extent the evapotranspiration fluxes are coupled to the biotic control of stomatal closure in the vegetation, especially in the pasture and during dry periods.
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spelling Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazoniaaerodynamic resistancedecoupling factorstomatal resistance.Abstract This work studied the behavior and seasonality of evapotranspiration influenced by biotic and abiotic factors through analysis of diurnal variation of aerodynamic resistance (ra), stomatal resistance (rs) and decoupling factor (Ω). This index was proposed by Jarvis and McNaughton (1986) as an indicative of the control of these resistances on the evapotranspiration of vegetation. Selection of representative data from wet and dry seasons from a primary forest in Central Amazonia and a primary forest and a pasture sites in Southwestern Amazonia had shown that: (i) rais about 20 s.m-1in both forests in both seasons, and ranges from 70 to 100 s.m-1in the pasture site; (ii) rsvaries both throughout the day and seasonally, with medians increasing from 40 in the morning, to 150 s.m-1in late afternoon, in the wet season in the forests and from 50 to 160 s.m-1in the pasture. These values increase in the dry season, with the forests rsranging from 50 up to 500 s.m-1and pasture rsstarting from 140 s.m-1and reaching up to more than 1800 s.m-1in the dry afternoons; (iii) Ω ranges from 0.5 to 0.8 during the wet season, and reduces to values below 0.5 in the afternoons during the dry season, indicating that, although a strong influence of net radiation in the evaporative loss is present, to a large extent the evapotranspiration fluxes are coupled to the biotic control of stomatal closure in the vegetation, especially in the pasture and during dry periods.Instituto de Pesquisas Ambientais em Bacias Hidrográficas2017-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2017000200179Revista Ambiente & Água v.12 n.2 2017reponame:Revista Ambiente & Águainstname:Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)instacron:IPABHI10.4136/ambi-agua.1832info:eu-repo/semantics/openAccessPaulino Junior,Narcisovon Randow,Rita de Cássia Silvavon Randow,Celsoeng2017-03-07T00:00:00Zoai:scielo:S1980-993X2017000200179Revistahttp://www.ambi-agua.net/PUBhttps://old.scielo.br/oai/scielo-oai.php||ambi.agua@gmail.com1980-993X1980-993Xopendoar:2017-03-07T00:00Revista Ambiente & Água - Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)false
dc.title.none.fl_str_mv Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
title Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
spellingShingle Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
Paulino Junior,Narciso
aerodynamic resistance
decoupling factor
stomatal resistance.
title_short Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
title_full Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
title_fullStr Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
title_full_unstemmed Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
title_sort Analysis of biological and meteorological controls of evapotranspiration in pristine forests and a pasture site in Amazonia
author Paulino Junior,Narciso
author_facet Paulino Junior,Narciso
von Randow,Rita de Cássia Silva
von Randow,Celso
author_role author
author2 von Randow,Rita de Cássia Silva
von Randow,Celso
author2_role author
author
dc.contributor.author.fl_str_mv Paulino Junior,Narciso
von Randow,Rita de Cássia Silva
von Randow,Celso
dc.subject.por.fl_str_mv aerodynamic resistance
decoupling factor
stomatal resistance.
topic aerodynamic resistance
decoupling factor
stomatal resistance.
description Abstract This work studied the behavior and seasonality of evapotranspiration influenced by biotic and abiotic factors through analysis of diurnal variation of aerodynamic resistance (ra), stomatal resistance (rs) and decoupling factor (Ω). This index was proposed by Jarvis and McNaughton (1986) as an indicative of the control of these resistances on the evapotranspiration of vegetation. Selection of representative data from wet and dry seasons from a primary forest in Central Amazonia and a primary forest and a pasture sites in Southwestern Amazonia had shown that: (i) rais about 20 s.m-1in both forests in both seasons, and ranges from 70 to 100 s.m-1in the pasture site; (ii) rsvaries both throughout the day and seasonally, with medians increasing from 40 in the morning, to 150 s.m-1in late afternoon, in the wet season in the forests and from 50 to 160 s.m-1in the pasture. These values increase in the dry season, with the forests rsranging from 50 up to 500 s.m-1and pasture rsstarting from 140 s.m-1and reaching up to more than 1800 s.m-1in the dry afternoons; (iii) Ω ranges from 0.5 to 0.8 during the wet season, and reduces to values below 0.5 in the afternoons during the dry season, indicating that, although a strong influence of net radiation in the evaporative loss is present, to a large extent the evapotranspiration fluxes are coupled to the biotic control of stomatal closure in the vegetation, especially in the pasture and during dry periods.
publishDate 2017
dc.date.none.fl_str_mv 2017-04-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2017000200179
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2017000200179
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.4136/ambi-agua.1832
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto de Pesquisas Ambientais em Bacias Hidrográficas
publisher.none.fl_str_mv Instituto de Pesquisas Ambientais em Bacias Hidrográficas
dc.source.none.fl_str_mv Revista Ambiente & Água v.12 n.2 2017
reponame:Revista Ambiente & Água
instname:Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
instacron:IPABHI
instname_str Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
instacron_str IPABHI
institution IPABHI
reponame_str Revista Ambiente & Água
collection Revista Ambiente & Água
repository.name.fl_str_mv Revista Ambiente & Água - Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHI)
repository.mail.fl_str_mv ||ambi.agua@gmail.com
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