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Quantifying canopy conductance in a pine forest during drought from combined sap flow and canopy surface temperature measurements

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorTABORSKI, Tom
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorCHIPEAUX, Christophe
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDEVERT, Nicolas
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLAFONT, Sébastien
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLOUSTAU, Denis
dc.date.accessioned2024-04-08T11:46:45Z
dc.date.available2024-04-08T11:46:45Z
dc.date.issued2022-08
dc.identifier.issn0168-1923
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195246
dc.description.abstractEnPrecise determination of canopy conductance (g(s)) is needed to quantify the water loss and CO2 exchange from forest canopies and their response to changing environmental conditions. In this study, we combined measurements of the leaf-to-air vapour pressure difference (D-L) derived from canopy surface temperature, and tree transpiration to calculate canopy g(s) in a pine forest at the ICOS site FR-Bil. The period covered was characterized by two consecutive droughts. The inversion of the generalised water transport equation (GT), along with its isothermal simplification (GT'), were used to calculate canopy g(s) and compared with gs determined from the inversion of the Penman-Monteith equation (PMT). A thermal infrared camera continuously monitored the canopy temperature and allowed to assess the time course of DL with half-hourly resolution. On average a 0.3 degrees C temperature difference was found between the canopy and surrounding air, with values ranging from -2 degrees C to +5 degrees C depending on the time of day, soil moisture and humidity. The three methods used to calculate gs, GT, GT' and PMT were in agreement under wet soil and low atmospheric demand, but differences up to 40% were found under water stress conditions when the canopy to air temperature differences led to substantial discrepancies between D-L and air saturation vapour pressure deficit at 8.2 m in the crown (D-8). Under such conditions the GT' method overestimated g(s) whereas the PMT method was closer from values estimated with the GT method. The contrasted behaviour of the atmospheric exchanges between the tree canopy and the overall ecosystem limits the use of the above canopy flux measurements alone to quantify the response of surface conductance to environmental drivers. Our results also advocate the use of in situ surface temperature measurements to better understand the response of plant canopies to environmental conditions.
dc.description.sponsorshipEffet du changement climatique sur les stratégies d'amélioration de l'utilisation en eau des bassin versants et des systèmes agrosylvopastoraux Méditerranéens
dc.description.sponsorshipCOntinental To coastal Ecosystems: evolution, adaptability and governance - ANR-10-LABX-0045
dc.description.sponsorshipLe fonctionnement hydraulique des plantes face au changement climatique - ANR-21-CE02-0033
dc.language.isoen
dc.publisherElsevier Masson
dc.subject.enLeaf temperature
dc.subject.enLeaf-to-air vapour pressure deficit
dc.subject.enPenman-Monteith
dc.subject.enSap-flux
dc.subject.enCanopy conductance
dc.subject.enTranspiration
dc.title.enQuantifying canopy conductance in a pine forest during drought from combined sap flow and canopy surface temperature measurements
dc.typeArticle de revue
dc.identifier.doi10.1016/j.agrformet.2022.108997
dc.subject.halSciences de l'environnement
bordeaux.journalAgricultural and Forest Meteorology
bordeaux.page108997
bordeaux.volume323
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03745456
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03745456v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Agricultural%20and%20Forest%20Meteorology&rft.date=2022-08&rft.volume=323&rft.spage=108997&rft.epage=108997&rft.eissn=0168-1923&rft.issn=0168-1923&rft.au=TABORSKI,%20Tom&DOMEC,%20Jean-Christophe&CHIPEAUX,%20Christophe&DEVERT,%20Nicolas&LAFONT,%20S%C3%A9bastien&rft.genre=article


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