Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela

Detalhes bibliográficos
Autor(a) principal: Herrera,Ana
Data de Publicação: 2013
Outros Autores: Ballestrini,Caín, Urich,Rosa, Rengifo,Elizabeth, González,Armando
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Theoretical and Experimental Plant Physiology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2197-00252013000200007
Resumo: Eucalypt plantations in Venezuela occupy 14% of land covered by savannas. Since water use by plantations in the savannas of Mapire (Venezuelan Llanos) was apparently similar to or lower than in the natural vegetation, evaluating how carbon fixation by plantations compares to the natural vegetation could help to elucidate whether plantations have higher water-use efficiency (WUE) than the savanna. We aimed to determine, using measurements of leaf gas exchange, the seasonal changes in photosynthetic rate (P N) and WUE of a seasonally dry savanna in Mapire, composed mainly of the grass Trachypogon vestitus and the tree Curatella americana, and trees of Eucalyptus urophylla growing in an experimental plantation. Daily integrated WUE (WUEint) was highest in C. americana and similar between T. vestitus and E. urophylla during both seasons. The Gross carbon fixation (GCF) at the leaf level in T. vestitus was similar to C. americana and lower than E. urophylla during the dry season, whereas during the rainy season it was nearly as high as in E. urophylla and both higher than C. americana. Gross carbon fixation (GCF) in T. vestitus was higher than in C. americana, but lower than in E. urophylla during the dry season, while it was much higher than the other two species during the rainy season. The contribution to savanna GCF of C. americana was small and constant throughout the seasons. The GCF in eucalypts was 15% higher than in the savanna during the dry season, but 45% lower during the rainy season, GCF averaging 85% of that in the savanna. Since water use by plantations is lower than in the savanna, they have a large potential for C sequestration without significantly altering ground water availability.
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spelling Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezueladry seasongross primary productionrainy seasonEucalypt plantations in Venezuela occupy 14% of land covered by savannas. Since water use by plantations in the savannas of Mapire (Venezuelan Llanos) was apparently similar to or lower than in the natural vegetation, evaluating how carbon fixation by plantations compares to the natural vegetation could help to elucidate whether plantations have higher water-use efficiency (WUE) than the savanna. We aimed to determine, using measurements of leaf gas exchange, the seasonal changes in photosynthetic rate (P N) and WUE of a seasonally dry savanna in Mapire, composed mainly of the grass Trachypogon vestitus and the tree Curatella americana, and trees of Eucalyptus urophylla growing in an experimental plantation. Daily integrated WUE (WUEint) was highest in C. americana and similar between T. vestitus and E. urophylla during both seasons. The Gross carbon fixation (GCF) at the leaf level in T. vestitus was similar to C. americana and lower than E. urophylla during the dry season, whereas during the rainy season it was nearly as high as in E. urophylla and both higher than C. americana. Gross carbon fixation (GCF) in T. vestitus was higher than in C. americana, but lower than in E. urophylla during the dry season, while it was much higher than the other two species during the rainy season. The contribution to savanna GCF of C. americana was small and constant throughout the seasons. The GCF in eucalypts was 15% higher than in the savanna during the dry season, but 45% lower during the rainy season, GCF averaging 85% of that in the savanna. Since water use by plantations is lower than in the savanna, they have a large potential for C sequestration without significantly altering ground water availability.Sociedade Brasileira de Fisiologia Vegetal2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2197-00252013000200007Theoretical and Experimental Plant Physiology v.25 n.2 2013reponame:Theoretical and Experimental Plant Physiologyinstname:Sociedade Brasileira de Fisiologia Vegetal (SBFV)instacron:SBFV10.1590/S2197-00252013000200007info:eu-repo/semantics/openAccessHerrera,AnaBallestrini,CaínUrich,RosaRengifo,ElizabethGonzález,Armandoeng2013-10-15T00:00:00Zoai:scielo:S2197-00252013000200007Revistahttps://www.springer.com/journal/40626ONGhttps://old.scielo.br/oai/scielo-oai.php||bjpp.sbfv@gmail.com2197-00252197-0025opendoar:2013-10-15T00:00Theoretical and Experimental Plant Physiology - Sociedade Brasileira de Fisiologia Vegetal (SBFV)false
dc.title.none.fl_str_mv Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
title Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
spellingShingle Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
Herrera,Ana
dry season
gross primary production
rainy season
title_short Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
title_full Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
title_fullStr Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
title_full_unstemmed Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
title_sort Seasonal changes in photosynthesis and water-use efficiency of savanna species and eucalypts in Venezuela
author Herrera,Ana
author_facet Herrera,Ana
Ballestrini,Caín
Urich,Rosa
Rengifo,Elizabeth
González,Armando
author_role author
author2 Ballestrini,Caín
Urich,Rosa
Rengifo,Elizabeth
González,Armando
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Herrera,Ana
Ballestrini,Caín
Urich,Rosa
Rengifo,Elizabeth
González,Armando
dc.subject.por.fl_str_mv dry season
gross primary production
rainy season
topic dry season
gross primary production
rainy season
description Eucalypt plantations in Venezuela occupy 14% of land covered by savannas. Since water use by plantations in the savannas of Mapire (Venezuelan Llanos) was apparently similar to or lower than in the natural vegetation, evaluating how carbon fixation by plantations compares to the natural vegetation could help to elucidate whether plantations have higher water-use efficiency (WUE) than the savanna. We aimed to determine, using measurements of leaf gas exchange, the seasonal changes in photosynthetic rate (P N) and WUE of a seasonally dry savanna in Mapire, composed mainly of the grass Trachypogon vestitus and the tree Curatella americana, and trees of Eucalyptus urophylla growing in an experimental plantation. Daily integrated WUE (WUEint) was highest in C. americana and similar between T. vestitus and E. urophylla during both seasons. The Gross carbon fixation (GCF) at the leaf level in T. vestitus was similar to C. americana and lower than E. urophylla during the dry season, whereas during the rainy season it was nearly as high as in E. urophylla and both higher than C. americana. Gross carbon fixation (GCF) in T. vestitus was higher than in C. americana, but lower than in E. urophylla during the dry season, while it was much higher than the other two species during the rainy season. The contribution to savanna GCF of C. americana was small and constant throughout the seasons. The GCF in eucalypts was 15% higher than in the savanna during the dry season, but 45% lower during the rainy season, GCF averaging 85% of that in the savanna. Since water use by plantations is lower than in the savanna, they have a large potential for C sequestration without significantly altering ground water availability.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2197-00252013000200007
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S2197-00252013000200007
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Sociedade Brasileira de Fisiologia Vegetal
publisher.none.fl_str_mv Sociedade Brasileira de Fisiologia Vegetal
dc.source.none.fl_str_mv Theoretical and Experimental Plant Physiology v.25 n.2 2013
reponame:Theoretical and Experimental Plant Physiology
instname:Sociedade Brasileira de Fisiologia Vegetal (SBFV)
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reponame_str Theoretical and Experimental Plant Physiology
collection Theoretical and Experimental Plant Physiology
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