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Evapotranspiration from a Mediterranean evergreen oak savannah: The role of trees and pasture

2009Journal article Restricted access
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dc.contributor.authorPaço, Teresa A.
dc.contributor.authorDavid, Teresa S.
dc.contributor.authorHenriques, Manuel O.
dc.contributor.authorPereira, João S.
dc.contributor.authorValente, Fernanda
dc.contributor.authorBanza, João
dc.contributor.authorPereira, Fernando Leite
dc.contributor.authorPinto, Clara
dc.contributor.authorDavid, Jorge Soares
dc.date.accessioned2022-02-01T11:16:32Z
dc.date.available2022-02-01T11:16:32Z
dc.date.issued2009
dc.description.abstractMediterranean evergreen oak woodlands of southern Portugal (montados) are savannah-type ecosystems with a widely sparse tree cover, over extensive grassland. Therefore, ecosystem water fluxes derive from two quite differentiated sources: the trees and the pasture. Partitioning of fluxes according to these dif- ferent sources is necessary to quantify overall ecosystem water losses as well as to improve knowledge on its functional behaviour. In southern Iberia, these woodlands are subjected to recurrent droughts. Therefore, reaction/resilience to water stress becomes an essential feature of vegetation on these ecosys- tems. Long-term tree transpiration was recorded for 6 years from a sample of holm oak (Quercus ilex ssp. rotundifolia) trees, using the Granier sap flow method. Ecosystem transpiration was measured by the eddy covariance technique for an 11-month period (February to December 2005), partly coincident with a drought year. Pasture transpiration was estimated as the difference between ecosystem (eddy covari- ance) and tree (sap flow) transpiration. Pasture transpiration stopped during the summer, when the sur- face soil dried up. In the other seasons, pasture transpiration showed a strong dependence on rainfall occurrence and on top soil water. Conversely, trees were able to maintain transpiration throughout the summer due to the deep root access to groundwater. Q. ilex trees showed a high resilience to both sea- sonal and annual drought. Tree transpiration represented more than half of ecosystem transpiration, in spite of the low tree density (30 trees ha􏰀1) and crown cover fraction (21%). Tree evapotranspiration was dominated by transpiration (76%), and interception loss represented only 24% of overall tree evaporation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPaço, T.A.; David, T.S.; Henriques, M.O.; Pereira, J.S.; Valente, F.; Banza, J.; Pereira, F.L.; Pinto, C.; David, J.S., 2009. Evapotranspiration from a Mediterranean evergreen oak savannah: The role of trees and pasture. Journal of Hydrology, 369(1-2): 98-106. DOI: 10.1016/j.jhydrol.2009.02.011pt_PT
dc.identifier.doi10.1016/j.jhydrol.2009.02.011pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.11/7872
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationProjects CARBOEUROPE – IP (GOCE-CT-2003-505572) of the European Union and POCI/AGR/59152/2004 of the Portuguese Foundation for Science and Technology supported the researchpt_PT
dc.subjectEcohydrologypt_PT
dc.subjectEddy covariancept_PT
dc.subjectGrasslandpt_PT
dc.subjectOak woodlandpt_PT
dc.subjectQuercus ilexpt_PT
dc.subjectTranspirationpt_PT
dc.titleEvapotranspiration from a Mediterranean evergreen oak savannah: The role of trees and pasturept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage106pt_PT
oaire.citation.issue1-2pt_PT
oaire.citation.startPage98pt_PT
oaire.citation.titleJournal of Hydrologypt_PT
oaire.citation.volume369pt_PT
person.familyNameLeite Pereira
person.givenNameFernando
person.identifier.ciencia-idB710-F492-0A79
person.identifier.orcid0000-0003-0087-4384
person.identifier.ridD-8053-2011
person.identifier.scopus-author-id25723657600
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication83206420-4fd8-4877-b0bd-3e1adb2131fa
relation.isAuthorOfPublication.latestForDiscovery83206420-4fd8-4877-b0bd-3e1adb2131fa

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