Repository logo
 
Publication

Disentangling drought-induced variation in ecosystem and soil respiration using stable carbon isotopes

2010-03-10Journal article Open access
Simple item page
datacite.subject.fosCiências Agrárias::Agricultura, Silvicultura e Pescas
datacite.subject.sdg03:Saúde de Qualidade
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
dc.contributor.authorUnger, Stephan
dc.contributor.authorMáguas, Cristina
dc.contributor.authorPereira, João S.
dc.contributor.authorAires, Luis M.
dc.contributor.authorDavid, Teresa S.
dc.contributor.authorWerner, Christiane
dc.date.accessioned2025-11-17T19:53:33Z
dc.date.available2025-11-17T19:53:33Z
dc.date.issued2010-03-10
dc.descriptionFonte: https://www.researchgate.net/publication/41850107_Disentangling_drought-induced_variation_in_ecosystem_and_soil_respiration_using_stable_carbon_isotopes
dc.description.abstractCombining C flux measurements with information on their isotopic composition can yield a process-based understanding of ecosystem C dynamics. We studied the variations in both respiratory fluxes and their stable C isotopic compositions (δ13C) for all major components (trees, understory, roots and soil microorganisms) in a Mediterranean oak savannah during a period with increasing drought. We found large drought-induced and diurnal dynamics in isotopic compositions of soil, root and foliage respiration (δ13Cres). Soil respiration was the largest contributor to ecosystem respiration (Reco), exhibiting a depleted isotopic signature and no marked variations with increasing drought, similar to ecosystem respired δ13CO2, providing evidence for a stable C-source and minor influence of recent photosynthate from plants. Short-term and diurnal variations in δ13Cres of foliage and roots (up to 8 and 4‰, respectively) were in agreement with: (1) recent hypotheses on post-photosynthetic fractionation processes, (2) substrate changes with decreasing assimilation rates in combination with increased respiratory demand, and (3) decreased phosphoenolpyruvate carboxylase activity in drying roots, while altered photosynthetic discrimination was not responsible for the observed changes in δ13Cres. We applied a flux-based and an isotopic flux-based mass balance, yielding good agreement at the soil scale, while the isotopic mass balance at the ecosystem scale was not conserved. This was mainly caused by uncertainties in Keeling plot intercepts at the ecosystem scale due to small CO2 gradients and large differences in δ13Cres of the different component fluxes. Overall, stable isotopes provided valuable new insights into the drought-related variations of ecosystem C dynamics, encouraging future studies but also highlighting the need of improved methodology to disentangle short-term dynamics of isotopic composition of Reco.eng
dc.description.sponsorshipThis project (ISOFLUX) has been financed by the Deutsche Forschungsgemeinschaft (DFG; WE 2681/2-1). The PIDDAC project (216/2001, Ministério da Agricultura, Portugal, to T. S. David) is acknowledged. The authors wish to thank J. Banza for technical support at the tower, R. Maia for isotope analysis and V. Andrade for flux data treatment. All experiments comply with the current laws of the country in which they were performed.
dc.identifier.citationUnger, S., Máguas, C., Pereira, J.S. et al. Disentangling drought-induced variation in ecosystem and soil respiration using stable carbon isotopes. Oecologia 163, 1043–1057 (2010). https://doi.org/10.1007/s00442-010-1576-6.
dc.identifier.doi10.1007/s00442-010-1576-6
dc.identifier.eissn1432-1939
dc.identifier.issn0029-8549
dc.identifier.urihttp://hdl.handle.net/10400.8/14637
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer Nature
dc.relation.hasversionhttps://link.springer.com/article/10.1007/s00442-010-1576-6
dc.relation.ispartofOecologia
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectKeeling plots
dc.subjectRespired carbon dioxide
dc.subjectEcosystem respired carbon dioxide stable isotopic composition
dc.subjectDrought
dc.subjectMediterranean ecosystem
dc.titleDisentangling drought-induced variation in ecosystem and soil respiration using stable carbon isotopeseng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1057
oaire.citation.startPage1043
oaire.citation.titleOecologia
oaire.citation.volume163
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameIgreja Aires
person.givenNameLuis Miguel
person.identifier.ciencia-id6C18-E6C2-F582
person.identifier.gsidhttps://scholar.google.com.br/citations?hl=pt-PT&user=7Wv10lIAAAAJ
person.identifier.orcid0000-0003-2052-6045
person.identifier.scopus-author-id16027706000
relation.isAuthorOfPublicatione0df930a-353f-433f-aeb4-ffdaff5a7aa1
relation.isAuthorOfPublication.latestForDiscoverye0df930a-353f-433f-aeb4-ffdaff5a7aa1

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Disentangling drought-induced variation in ecosystem and soil respiration using stable carbon isotopes.pdf
Size:
550.02 KB
Format:
Adobe Portable Document Format
Description:
Combining C flux measurements with information on their isotopic composition can yield a process-based understanding of ecosystem C dynamics. We studied the variations in both respiratory fluxes and their stable C isotopic compositions (δ13C) for all major components (trees, understory, roots and soil microorganisms) in a Mediterranean oak savannah during a period with increasing drought. We found large drought-induced and diurnal dynamics in isotopic compositions of soil, root and foliage respiration (δ13Cres). Soil respiration was the largest contributor to ecosystem respiration (Reco), exhibiting a depleted isotopic signature and no marked variations with increasing drought, similar to ecosystem respired δ13CO2, providing evidence for a stable C-source and minor influence of recent photosynthate from plants. Short-term and diurnal variations in δ13Cres of foliage and roots (up to 8 and 4‰, respectively) were in agreement with: (1) recent hypotheses on post-photosynthetic fractionation processes, (2) substrate changes with decreasing assimilation rates in combination with increased respiratory demand, and (3) decreased phosphoenolpyruvate carboxylase activity in drying roots, while altered photosynthetic discrimination was not responsible for the observed changes in δ13Cres. We applied a flux-based and an isotopic flux-based mass balance, yielding good agreement at the soil scale, while the isotopic mass balance at the ecosystem scale was not conserved. This was mainly caused by uncertainties in Keeling plot intercepts at the ecosystem scale due to small CO2 gradients and large differences in δ13Cres of the different component fluxes. Overall, stable isotopes provided valuable new insights into the drought-related variations of ecosystem C dynamics, encouraging future studies but also highlighting the need of improved methodology to disentangle short-term dynamics of isotopic composition of Reco.
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.32 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ESTG - Artigos em revistas internacionais