Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland

Detalhes bibliográficos
Autor(a) principal: Costa-e-Silva, Filipe
Data de Publicação: 2015
Outros Autores: Correia, Alexandra C., Piayda, Arndt, Dubbert, Maren, Rebmann, Corinna, Cuntz, Matthias, Werner, Christiane, David, Jorge Soares, Pereira, João Santos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/14034
Resumo: In seasonally dry climates, such as the Mediterranean, lack of rainfall in the usually wet winter may originate severe droughts which are a main cause of inter-annual variation in carbon sequestration. Leaf phenology variability may alter the seasonal pattern of photosynthetic uptake, which in turn is determined by leaf gas exchange limitations. The current study is based on the monitoring of an extremely dry winter in an evergreen cork oak woodland under the Mediterranean climate of central Portugal. Results are focused on net ecosystem CO2 exchange (NEE), phenology and tree growth measurements during two contrasting years: 2011, a wet year with a typical summer drought pattern and 2012, with an extremely unusual dry winter (only 10mmof total rainfall) that exacerbated the following summer drought effects. Main aims of this study were to assess the effects of an extreme dry winter in (1) annual and seasonal net ecosystem CO2 exchange, and in (2) cork oak phenology. The dry year 2012 was marked by a 45% lower carbon sequestration (−214 vs. −388gCm−2 year−1) and a 63% lower annual tree diameter growth but only a 9% lower leaf area index compared to the wet year 2011. A significant reduction of 15% in yearly carbon sequestration was associated with leaf phenological events of canopy renewal in the early spring. In contrast to male flower production, fruit setting was severely depressed by water stress with a 54% decrease during the dry year. Our results suggest that leaf growth and leaf area maintenance are resilient ecophysiological processes under winter drought and are a priority carbon sink for photoassimilates in contrast to tree diameter growth. Thus, carbon sequestration reductions under low water availabilities in cork oak woodland should be ascribed to stomatal regulation or photosynthetic limitations and to a lesser extent to leaf area reductions
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spelling Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodlandCO2 fluxesevergreen oakleaf area indexMediterranean woodlandQuercus subertree diameter incrementIn seasonally dry climates, such as the Mediterranean, lack of rainfall in the usually wet winter may originate severe droughts which are a main cause of inter-annual variation in carbon sequestration. Leaf phenology variability may alter the seasonal pattern of photosynthetic uptake, which in turn is determined by leaf gas exchange limitations. The current study is based on the monitoring of an extremely dry winter in an evergreen cork oak woodland under the Mediterranean climate of central Portugal. Results are focused on net ecosystem CO2 exchange (NEE), phenology and tree growth measurements during two contrasting years: 2011, a wet year with a typical summer drought pattern and 2012, with an extremely unusual dry winter (only 10mmof total rainfall) that exacerbated the following summer drought effects. Main aims of this study were to assess the effects of an extreme dry winter in (1) annual and seasonal net ecosystem CO2 exchange, and in (2) cork oak phenology. The dry year 2012 was marked by a 45% lower carbon sequestration (−214 vs. −388gCm−2 year−1) and a 63% lower annual tree diameter growth but only a 9% lower leaf area index compared to the wet year 2011. A significant reduction of 15% in yearly carbon sequestration was associated with leaf phenological events of canopy renewal in the early spring. In contrast to male flower production, fruit setting was severely depressed by water stress with a 54% decrease during the dry year. Our results suggest that leaf growth and leaf area maintenance are resilient ecophysiological processes under winter drought and are a priority carbon sink for photoassimilates in contrast to tree diameter growth. Thus, carbon sequestration reductions under low water availabilities in cork oak woodland should be ascribed to stomatal regulation or photosynthetic limitations and to a lesser extent to leaf area reductionsElsevierRepositório da Universidade de LisboaCosta-e-Silva, FilipeCorreia, Alexandra C.Piayda, ArndtDubbert, MarenRebmann, CorinnaCuntz, MatthiasWerner, ChristianeDavid, Jorge SoaresPereira, João Santos2017-09-11T10:34:11Z20152015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/14034engAgricultural and Forest Meteorology 204 (2015) 48–57http://dx.doi.org/10.1016/j.agrformet.2015.01.017info: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:RCAAP2024-11-20T19:03:38Zoai:repositorio.ul.pt:10400.5/14034Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-20T19:03:38Repositório 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 Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
title Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
spellingShingle Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
Costa-e-Silva, Filipe
CO2 fluxes
evergreen oak
leaf area index
Mediterranean woodland
Quercus suber
tree diameter increment
title_short Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
title_full Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
title_fullStr Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
title_full_unstemmed Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
title_sort Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at cork oak woodland
author Costa-e-Silva, Filipe
author_facet Costa-e-Silva, Filipe
Correia, Alexandra C.
Piayda, Arndt
Dubbert, Maren
Rebmann, Corinna
Cuntz, Matthias
Werner, Christiane
David, Jorge Soares
Pereira, João Santos
author_role author
author2 Correia, Alexandra C.
Piayda, Arndt
Dubbert, Maren
Rebmann, Corinna
Cuntz, Matthias
Werner, Christiane
David, Jorge Soares
Pereira, João Santos
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Costa-e-Silva, Filipe
Correia, Alexandra C.
Piayda, Arndt
Dubbert, Maren
Rebmann, Corinna
Cuntz, Matthias
Werner, Christiane
David, Jorge Soares
Pereira, João Santos
dc.subject.por.fl_str_mv CO2 fluxes
evergreen oak
leaf area index
Mediterranean woodland
Quercus suber
tree diameter increment
topic CO2 fluxes
evergreen oak
leaf area index
Mediterranean woodland
Quercus suber
tree diameter increment
description In seasonally dry climates, such as the Mediterranean, lack of rainfall in the usually wet winter may originate severe droughts which are a main cause of inter-annual variation in carbon sequestration. Leaf phenology variability may alter the seasonal pattern of photosynthetic uptake, which in turn is determined by leaf gas exchange limitations. The current study is based on the monitoring of an extremely dry winter in an evergreen cork oak woodland under the Mediterranean climate of central Portugal. Results are focused on net ecosystem CO2 exchange (NEE), phenology and tree growth measurements during two contrasting years: 2011, a wet year with a typical summer drought pattern and 2012, with an extremely unusual dry winter (only 10mmof total rainfall) that exacerbated the following summer drought effects. Main aims of this study were to assess the effects of an extreme dry winter in (1) annual and seasonal net ecosystem CO2 exchange, and in (2) cork oak phenology. The dry year 2012 was marked by a 45% lower carbon sequestration (−214 vs. −388gCm−2 year−1) and a 63% lower annual tree diameter growth but only a 9% lower leaf area index compared to the wet year 2011. A significant reduction of 15% in yearly carbon sequestration was associated with leaf phenological events of canopy renewal in the early spring. In contrast to male flower production, fruit setting was severely depressed by water stress with a 54% decrease during the dry year. Our results suggest that leaf growth and leaf area maintenance are resilient ecophysiological processes under winter drought and are a priority carbon sink for photoassimilates in contrast to tree diameter growth. Thus, carbon sequestration reductions under low water availabilities in cork oak woodland should be ascribed to stomatal regulation or photosynthetic limitations and to a lesser extent to leaf area reductions
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01T00:00:00Z
2017-09-11T10:34:11Z
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/10400.5/14034
url http://hdl.handle.net/10400.5/14034
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Agricultural and Forest Meteorology 204 (2015) 48–57
http://dx.doi.org/10.1016/j.agrformet.2015.01.017
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 Elsevier
publisher.none.fl_str_mv Elsevier
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 mluisa.alvim@gmail.com
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