Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)

Detalhes bibliográficos
Autor(a) principal: Cerasoli, Sofia
Data de Publicação: 2009
Outros Autores: McGuire, M.A., Faria, J., Mourato, Miguel, Schmidt, M., Pereira, J.S., Chaves, Maria Manuela, Teskey, R.O.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/9015
Resumo: Research Paper
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spelling Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)Eucalyptus globulusrefixationstemrespirationResearch PaperIn spite of the importance of respiration in forest carbon budgets, the mechanisms by which physiological factors control stem respiration are unclear. An experiment was set up in a Eucalyptus globulus plantation in central Portugal with monoculture stands of 5-year-old and 10-year-old trees. CO2 efflux from stems under shaded and unshaded conditions, as well as the concentration of CO2 dissolved in sap [CO2 *], stem temperature, and sap flow were measured with the objective of improving our understanding of the factors controlling CO2 release from stems of E. globulus. CO2 efflux was consistently higher in 5-year-old, compared with 10-year-old, stems, averaging 3.4 versus 1.3 mmol m22 s21, respectively. Temperature and [CO2 *] both had important, and similar, influences on the rate of CO2 efflux from the stems, but neither explained the difference in the magnitude of CO2 efflux between trees of different age and size. No relationship was found between efflux and sap flow, and efflux was independent of tree volume, suggesting the presence of substantial barriers to the diffusion of CO2 from the xylem to the atmosphere in this species. The rate of corticular photosynthesis was the same in trees of both ages and only reduced CO2 efflux by 7%, probably due to the low irradiance at the stem surface below the canopy. The younger trees were growing at a much faster rate than the older trees. The difference between CO2 efflux from the younger and older stems appears to have resulted from a difference in growth respiration rather than a difference in the rate of diffusion of xylemtransported CO2Oxford University PressRepositório da Universidade de LisboaCerasoli, SofiaMcGuire, M.A.Faria, J.Mourato, MiguelSchmidt, M.Pereira, J.S.Chaves, Maria ManuelaTeskey, R.O.2015-07-20T15:11:30Z20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/9015eng"Journal of Experimental Botany". ISSN 0022-0957. 60(1) (2009) p.99-10510:1093/jxb/ern272info: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:RCAAP2023-03-06T14:39:32Zoai:www.repository.utl.pt:10400.5/9015Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:51.955705Repositório 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 Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
title Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
spellingShingle Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
Cerasoli, Sofia
Eucalyptus globulus
refixation
stem
respiration
title_short Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
title_full Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
title_fullStr Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
title_full_unstemmed Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
title_sort Co2 efflux, co2 concentration and photosynthetic refixation in stems of Eucalyptus globulus (Labill.)
author Cerasoli, Sofia
author_facet Cerasoli, Sofia
McGuire, M.A.
Faria, J.
Mourato, Miguel
Schmidt, M.
Pereira, J.S.
Chaves, Maria Manuela
Teskey, R.O.
author_role author
author2 McGuire, M.A.
Faria, J.
Mourato, Miguel
Schmidt, M.
Pereira, J.S.
Chaves, Maria Manuela
Teskey, R.O.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Cerasoli, Sofia
McGuire, M.A.
Faria, J.
Mourato, Miguel
Schmidt, M.
Pereira, J.S.
Chaves, Maria Manuela
Teskey, R.O.
dc.subject.por.fl_str_mv Eucalyptus globulus
refixation
stem
respiration
topic Eucalyptus globulus
refixation
stem
respiration
description Research Paper
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01T00:00:00Z
2015-07-20T15:11:30Z
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://hdl.handle.net/10400.5/9015
url http://hdl.handle.net/10400.5/9015
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Journal of Experimental Botany". ISSN 0022-0957. 60(1) (2009) p.99-105
10:1093/jxb/ern272
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.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv 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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