Influence of leaf water potential on diurnal changes in CO2 and water vapour fluxes

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dc.contributor.author Yu, Qiang en_US
dc.contributor.author Xu, Shou-Hua en_US
dc.contributor.author Wang, Jing en_US
dc.contributor.author Lee, Xuhui en_US
dc.contributor.editor en_US
dc.date.accessioned 2010-05-28T09:43:46Z
dc.date.available 2010-05-28T09:43:46Z
dc.date.issued 2007 en_US
dc.identifier 2008006450 en_US
dc.identifier.citation Yu Qiang et al. 2007, 'Influence of leaf water potential on diurnal changes in CO2 and water vapour fluxes', Springer Netherlands, vol. 124, pp. 161-181. en_US
dc.identifier.issn 0006-8314 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8525
dc.description.abstract Mass and energy fluxes between the atmosphere and vegetation are driven by meteorological variables, and controlled by plant water status, which may change more markedly diurnally than soil water. We tested the hypothesis that integration of dynamic changes in leaf water potential may improve the simulation of CO2 and water fluxes over a wheat canopy. Simulation of leaf water potential was integrated into a comprehensive model (the ChinaAgrosys) of heat, water and CO2 fluxes and crop growth. Photosynthesis from individual leaves was integrated to the canopy by taking into consideration the attenuation of radiation when penetrating the canopy. Transpiration was calculated with the Shuttleworth-Wallace model in which canopy resistance was taken as a link between energy balance and physiological regulation. A revised version of the Ball-Woodrow-Berry stomatal model was applied to produce a new canopy resistance model, which was validated against measured CO2 and water vapour fluxes over winter wheat fields in Yucheng (36?57? N, 116?36? E, 28 m above sea level) in the North China Plain during 1997, 2001 and 2004. Leaf water potential played an important role in causing stomatal conductance to fall at midday, which caused diurnal changes in photosynthesis and transpiration. Changes in soil water potential were less important. Inclusion of the dynamics of leaf water potential can improve the precision of the simulation of CO2 and water vapour fluxes, especially in the afternoon under water stress conditions. en_US
dc.language en_US
dc.publisher Springer Netherlands en_US
dc.relation.isbasedon http://dx.doi.org/10.1007/s10546-007-9164-y en_US
dc.title Influence of leaf water potential on diurnal changes in CO2 and water vapour fluxes en_US
dc.parent Boundary-Layer Meteorology en_US
dc.journal.volume 124 en_US
dc.journal.number en_US
dc.journal.number 2 en_US
dc.publocation Netherlands en_US
dc.identifier.startpage 161 en_US
dc.identifier.endpage 181 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 040100 en_US
dc.personcode 107001 en_US
dc.personcode 0000050027 en_US
dc.personcode 0000051709 en_US
dc.personcode 0000051710 en_US
dc.percentage 100 en_US
dc.classification.name Atmospheric Sciences 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 CO2 flux, Leaf water potential, North China Plain, Water vapour flux, Winter wheat en_US
dc.staffid en_US


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