Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001 |
Resumo: | Seasonal patterns of carbon assimilation and evapotranspiration of 2004 in Eucalyptus globulus plantation of the CarboEurope-IP Portuguese site of Herdade da Espirra are discussed. The atmospheric fluxes were obtained by the eddy covariance method. A separation of atmospheric carbon flux, or net ecosystem exchange (NEE), in gross primary production (GPP) and ecosystem respiration (Reco), was made and analysed the variation of atmospheric fluxes with some micrometeorological variables. The plantation acted as a strong carbon sink, with a NEE of 7.9tonC.ha-1.yr-1. The diurnal NEE was mainly a function of global solar radiation, with which it is perfectly in phase all year around, except for the period between July and September. In these months, stomatal closure, strongly dependent on the water vapour pressure deficit in the atmosphere (WVD) high values and low water availability, was the main factor controlling carbon assimilation, a tendency already noticed in 2002 and 2003. The evapotranspiration is clearly controlled by water vapour deficit with decoupling factors ( Ω ) varying from 0.1 to 0.4, typical data for forest canopies. In the period from July to September evapotranspiration dependency on WVD increases as a consequence of the stomatal closure. |
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Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantationseasonal patternsevapotranspirationcarbonradiationvapour pressureSeasonal patterns of carbon assimilation and evapotranspiration of 2004 in Eucalyptus globulus plantation of the CarboEurope-IP Portuguese site of Herdade da Espirra are discussed. The atmospheric fluxes were obtained by the eddy covariance method. A separation of atmospheric carbon flux, or net ecosystem exchange (NEE), in gross primary production (GPP) and ecosystem respiration (Reco), was made and analysed the variation of atmospheric fluxes with some micrometeorological variables. The plantation acted as a strong carbon sink, with a NEE of 7.9tonC.ha-1.yr-1. The diurnal NEE was mainly a function of global solar radiation, with which it is perfectly in phase all year around, except for the period between July and September. In these months, stomatal closure, strongly dependent on the water vapour pressure deficit in the atmosphere (WVD) high values and low water availability, was the main factor controlling carbon assimilation, a tendency already noticed in 2002 and 2003. The evapotranspiration is clearly controlled by water vapour deficit with decoupling factors ( Ω ) varying from 0.1 to 0.4, typical data for forest canopies. In the period from July to September evapotranspiration dependency on WVD increases as a consequence of the stomatal closure.Unidade de Silvicultura e Produtos Florestais2006-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001Silva Lusitana v.14 n.2 2006reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAPenghttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001Mateus,JoãoPita,GabrielRodrigues,AbelOliveira,Hélèneinfo:eu-repo/semantics/openAccess2024-02-06T16:59:09Zoai:scielo:S0870-63522006000200001Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:15:35.499351Repositório 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 Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
title |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
spellingShingle |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation Mateus,João seasonal patterns evapotranspiration carbon radiation vapour pressure |
title_short |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
title_full |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
title_fullStr |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
title_full_unstemmed |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
title_sort |
Seasonal Evolution of the Evapotranspiration Regime and Carbon Assimilation Over a Eucalyptus globulus Plantation |
author |
Mateus,João |
author_facet |
Mateus,João Pita,Gabriel Rodrigues,Abel Oliveira,Hélène |
author_role |
author |
author2 |
Pita,Gabriel Rodrigues,Abel Oliveira,Hélène |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Mateus,João Pita,Gabriel Rodrigues,Abel Oliveira,Hélène |
dc.subject.por.fl_str_mv |
seasonal patterns evapotranspiration carbon radiation vapour pressure |
topic |
seasonal patterns evapotranspiration carbon radiation vapour pressure |
description |
Seasonal patterns of carbon assimilation and evapotranspiration of 2004 in Eucalyptus globulus plantation of the CarboEurope-IP Portuguese site of Herdade da Espirra are discussed. The atmospheric fluxes were obtained by the eddy covariance method. A separation of atmospheric carbon flux, or net ecosystem exchange (NEE), in gross primary production (GPP) and ecosystem respiration (Reco), was made and analysed the variation of atmospheric fluxes with some micrometeorological variables. The plantation acted as a strong carbon sink, with a NEE of 7.9tonC.ha-1.yr-1. The diurnal NEE was mainly a function of global solar radiation, with which it is perfectly in phase all year around, except for the period between July and September. In these months, stomatal closure, strongly dependent on the water vapour pressure deficit in the atmosphere (WVD) high values and low water availability, was the main factor controlling carbon assimilation, a tendency already noticed in 2002 and 2003. The evapotranspiration is clearly controlled by water vapour deficit with decoupling factors ( Ω ) varying from 0.1 to 0.4, typical data for forest canopies. In the period from July to September evapotranspiration dependency on WVD increases as a consequence of the stomatal closure. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-12-01 |
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://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001 |
url |
http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-63522006000200001 |
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 |
Unidade de Silvicultura e Produtos Florestais |
publisher.none.fl_str_mv |
Unidade de Silvicultura e Produtos Florestais |
dc.source.none.fl_str_mv |
Silva Lusitana v.14 n.2 2006 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 |
|
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1799137255277723648 |