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TitreAssessment of canopy stomatal conductance models using flux measurements
AuteurWang, S; Yang, Y; Trishchenko, A P
SourceEcological Modelling vol. 220, 2009 p. 2115-2118, https://doi.org/10.1016/j.ecolmodel.2009.04.044
Année2009
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090074
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.ecolmodel.2009.04.044
Mediapapier
Formatspdf
Sujetstélédétection; végétation; inventaires de terrains; types de terrain; classement des sols; types pédologiques; géologie de l'environnement; pédologie
Illustrationshistograms; plots; tables
ProgrammeLes sciences de la Terre à l'appui de la caractérisation, à l'échelle nationale, des impacts des changements climatiques sur la masse continentale canadienne, Géosciences de changements climatiques
Résumé(disponible en anglais seulement)
Stomatal conductance (g) is a key parameter in controlling energy and water exchanges between canopy and the atmosphere. Stomatal conductance models proposed by Ball, Woodrow and Berry (BWB) and Leuning have been increasingly used in land surface schemes. In a recent study, a new diagnostic index was developed byWang et al. to examine the response of g to humidity and new models were proposed to resolve problems identified in the BWB and Leuning models. This approach is theoretically sound, but relies on canopy latent heat and CO2 fluxes and environmental variables at the leaf surface which are not available at most eddy correlation (EC) observation sites. In this study, we tested the diagnostic index by empirically correcting EC measurements to canopy-level fluxes and by replacing leaf surface variables by their corresponding ambient air variables, and re-examined the stomatal conductance models of BWB, Leuning, and Wang et al. We found that the impact of the above modifications on the evaluation of g-humidity relationships is very small. This study provides apractical approachto investigate the stomatal response to humidity using routine EC measurements.
GEOSCAN ID247415