Regulation of canopy conductance and transpiration and their modelling in irrigated grapevines

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dc.contributor.author Lu, Ping en_US
dc.contributor.author Yunusa, Isa en_US
dc.contributor.author Walker, Robert R en_US
dc.contributor.author Muller, Warren en_US
dc.contributor.editor en_US
dc.date.accessioned 2010-05-28T09:45:47Z
dc.date.available 2010-05-28T09:45:47Z
dc.date.issued 2003 en_US
dc.identifier 2006006323 en_US
dc.identifier.citation Lu Ping et al. 2003, 'Regulation of canopy conductance and transpiration and their modelling in irrigated grapevines', CSIRO, vol. 30, no. 6, pp. 689-698. en_US
dc.identifier.issn 1445-4408 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8844
dc.description.abstract Whole-vine transpiration was estimated for well-watered nine-year-old Sultana grapevines (Vitis vinifera L. cv. Sultana) from xylem sap flow measured with Granier's heat-dissipation probes. Canopy conductance of the grapevine was calculated by inverting the Penman Monteith equation. Transpiration from grapevine canopies was strongly controlled by the canopy conductance. Canopy conductance decreased exponentially with increasing vapour pressure deficit (VPD) except in the morning when solar radiation was less than 200 W m^2 and the canopy conductance was predominantly limited by the solar radiation. A non-linear model of canopy conductance as a function of the solar radiation and VPD explained > 90% of the variation observed in canopy conductance. Under contrasting VPD conditions (daytime maximum of 3 kPa vs 8 kPa), grapevines were able to regulate their canopy conductance from 0.006 to 0.001 m s-1 to maintain a near constant transpiration. Whole-canopy transpiration calculated from modelled canopy conductance using the PenmanMonteith equation was highly correlated with the measured transpiration (sap flow) values over the range of 0-0.20 mm h-1 (R2 > 0.85). Cross-validation shows that these mechanistic models based on solar radiation and VPD provide good predictions of canopy conductance and transpiration under the conditions of the study. en_US
dc.language en_US
dc.publisher CSIRO en_US
dc.relation.isbasedon http://dx.doi.org/10.1071/FP02181 en_US
dc.title Regulation of canopy conductance and transpiration and their modelling in irrigated grapevines en_US
dc.parent Functional Plant Biology en_US
dc.journal.volume 30 en_US
dc.journal.number 6 en_US
dc.publocation Collingwood VIC, Australia en_US
dc.identifier.startpage 689 en_US
dc.identifier.endpage 698 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 060700 en_US
dc.personcode 0000020600 en_US
dc.personcode 030005 en_US
dc.personcode 0000020601 en_US
dc.personcode 0000020602 en_US
dc.percentage 100 en_US
dc.classification.name Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords canopy conductance, decoupling factor, sap flow, vapour pressure deficit, Vitis vinifera L. en_US


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