Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah

Detalhes bibliográficos
Autor(a) principal: Unger, Stephan
Data de Publicação: 2012
Outros Autores: Máguas, Cristina, Pereira, João Santos, David, Teresa S., Werner, Christiane
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/4291
Resumo: Available at ScienceDirect
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spelling Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannahMediterranean woodlandsoil respirationbirch effectdroughtrain pulsestable carbon isotopesAvailable at ScienceDirectA transient increase in soil carbon dioxide efflux after rewetting of previously dry soils, termed the Birch effect, can significantly influence the ecosystem carbon balance. This has generally been related to increased soil microbial respiration in response to a temporal increase in labile soil carbon. In order to quantify ecosystem carbon losses by the Birch effect and to trace the underlying biogeochemical processes, we monitored the effects of first natural rain pulses on soil and ecosystem carbon dioxide fluxes and their isotopic composition ( 13C) after an extended summer drought in a Mediterranean oak woodland. While GPP was affected negatively, rain largely enhanced soil respiratory processes, which increased their relative contribution to NEE by up to 95%, resulting in a significant net carbon loss from the ecosystem. This was reflected by high correlation (r 0.91) between the two fluxes. Further, isotopic composition of soil respiration ( 13CS) explained on average 71% of the isotopic composition of ecosystem respiration ( 13CR). We found a strong relationship between soil moisture and the increase in soil respiration (RS) and NEE, indicating that the Birch effect observed during this study did not result from a transient increase in labile soil carbon but from a gradual (several days) moisture response of size and/or activity of the soil microbial community. We also observed large variation in 13C of soil and ecosystem respired CO2 that corresponded to the rain pulses with enrichment of up to 8 and 6‰, respectively, and a subsequent depletion to initial values during the following dry days, which might be explained by increased relative contribution of soil microbial communities from deeper soil layers to overall soil respiration, a switch in the respired carbon source (e.g. anaplerotic carbon) and changes in apparent fractionation during the mineralization of soil organic matter after the depletion of labile carbon poolsElsevierRepositório da Universidade de LisboaUnger, StephanMáguas, CristinaPereira, João SantosDavid, Teresa S.Werner, Christiane2012-04-26T14:06:07Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/4291eng"Agricultural and Forest Meteorology". ISSN 0168-1923. 154-155 (2012) 9-180168-1923info: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:RCAAP2023-03-06T14:35:17Zoai:www.repository.utl.pt:10400.5/4291Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:51:59.249244Repositório 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 Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
title Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
spellingShingle Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
Unger, Stephan
Mediterranean woodland
soil respiration
birch effect
drought
rain pulse
stable carbon isotopes
title_short Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
title_full Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
title_fullStr Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
title_full_unstemmed Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
title_sort Interpreting post-drought rewetting effects on soil and ecosystem carbon dynamics in a Mediterranean oak savannah
author Unger, Stephan
author_facet Unger, Stephan
Máguas, Cristina
Pereira, João Santos
David, Teresa S.
Werner, Christiane
author_role author
author2 Máguas, Cristina
Pereira, João Santos
David, Teresa S.
Werner, Christiane
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Unger, Stephan
Máguas, Cristina
Pereira, João Santos
David, Teresa S.
Werner, Christiane
dc.subject.por.fl_str_mv Mediterranean woodland
soil respiration
birch effect
drought
rain pulse
stable carbon isotopes
topic Mediterranean woodland
soil respiration
birch effect
drought
rain pulse
stable carbon isotopes
description Available at ScienceDirect
publishDate 2012
dc.date.none.fl_str_mv 2012-04-26T14:06:07Z
2012
2012-01-01T00:00:00Z
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/10400.5/4291
url http://hdl.handle.net/10400.5/4291
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Agricultural and Forest Meteorology". ISSN 0168-1923. 154-155 (2012) 9-18
0168-1923
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
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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
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