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

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dc.contributor.author Yu, Q
dc.contributor.author Xu, S
dc.contributor.author Wang, J
dc.contributor.author Lee, X
dc.date.accessioned 2010-05-28T09:43:46Z
dc.date.issued 2007-01
dc.identifier.citation Boundary-Layer Meteorology, 2007, 124 (2), pp. 161 - 181
dc.identifier.issn 0006-8314
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.
dc.publisher Springer Netherlands
dc.relation.isbasedon 10.1007/s10546-007-9164-y
dc.title Influence of leaf water potential on diurnal changes in CO2 and water vapour fluxes
dc.type Journal Article
dc.parent Boundary-Layer Meteorology
dc.journal.volume 2
dc.journal.volume 124
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 0401 Atmospheric Sciences
dc.personcode 107001
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.description.keywords CO2 flux, Leaf water potential, North China Plain, Water vapour flux, Winter wheat
dc.description.keywords CO2 flux, Leaf water potential, North China Plain, Water vapour flux, Winter wheat
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10


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