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Change in water loss regulation after canopy clearcut of a dominant shrub in Sahelian agrosystems, Guiera senegalensis J. F. Gmel

hal.structure.identifierAbdou Moumouni University of Niamey = Université Abdou Moumouni de Niamey [UAM]
hal.structure.identifierHydrosciences Montpellier [HSM]
dc.contributor.authorISSOUFOU, Hassane Bil-Assanou
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierLaboratoire d'étude des transferts en hydrologie et environnement [LTHE]
dc.contributor.authorLAURENT, Jean-Paul
hal.structure.identifierAbdou Moumouni University of Niamey = Université Abdou Moumouni de Niamey [UAM]
dc.contributor.authorSAADOU, Mahamane
hal.structure.identifierAbdou Moumouni University of Niamey = Université Abdou Moumouni de Niamey [UAM]
dc.contributor.authorMAHAMANE, Ali
hal.structure.identifierHydrosciences Montpellier [HSM]
dc.contributor.authorCAPPELAERE, Bernard
hal.structure.identifierHydrosciences Montpellier [HSM]
dc.contributor.authorDEMARTY, Jerome
hal.structure.identifierHydrosciences Montpellier [HSM]
dc.contributor.authorOI, Monique
hal.structure.identifierCentre d’Ecologie Fonctionnelle et Evolutive [CEFE]
dc.contributor.authorRAMBAL, Serge
hal.structure.identifierHydrosciences Montpellier [HSM]
dc.contributor.authorSEGHIERI, Josiane
dc.date.issued2013
dc.identifier.issn0931-1890
dc.description.abstractEnThis paper analyzes the effect of the canopy age of Guiera senegalensis J.F. Gmel on water regulation processes and adaptative strategy to drought over a period of 2 years. The species is widespread in the agricultural Sahel. Before sowing, farmers cut back the shrubs to limit competition with crops. The stumps resprout after the millet harvest. Leaf water potential and stomatal conductance were measured in two fallows and in the two adjacent cultivated fields. Leaf transpiration rate and soil-to-leaf hydraulic conductance were deduced. The decrease in both stomatal and plant hydraulic conductance caused by seasonal drought was greater in mature shrubs than in current year resprouts. The decrease in predawn and midday leaf water potentials in response to seasonal drought was isohydrodynamic, and it was greater in mature shrubs, suggesting that current year resprouts are under less stress. In resprouts, the leaf transpiration rate stopped increasing beyond a hydraulic conductance threshold of 0.05 mol. m−2 s−1 MPa−1. Vulnerability to cavitation was determined on segments of stems in the laboratory. The leaf water potential value at which stomatal closure occurred was −2.99 ± 0.68 MPa, which corresponded to a 30 % loss in xylem conductivity. Thanks to its positive safety margin of 0.6 MPa, G. senegalensis can survive above this value. The observed strategy places G. senegalensis among the non-extreme xeric plants, leading us to suppose that this species will be vulnerable to the expected increase in regional drought.
dc.language.isoen
dc.publisherSpringer Verlag
dc.subject.enAdaptation Embolism
dc.subject.enFunctional limits
dc.subject.enGuiera senegalensis
dc.subject.enHydraulic conductance
dc.subject.enTranspiration rate
dc.title.enChange in water loss regulation after canopy clearcut of a dominant shrub in Sahelian agrosystems, Guiera senegalensis J. F. Gmel
dc.typeArticle de revue
dc.identifier.doi10.1007/s00468-013-0852-6
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Hydrologie
bordeaux.journalTrees - Structure and Function
bordeaux.page1011-1022
bordeaux.volume27
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-01863529
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01863529v1
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