| Titre | Assessment of canopy stomatal conductance models using flux measurements |
| Auteur | Wang, S; Yang, Y; Trishchenko, A P |
| Source | Ecological Modelling vol. 220, 2009 p. 2115-2118, https://doi.org/10.1016/j.ecolmodel.2009.04.044 |
| Année | 2009 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20090074 |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.ecolmodel.2009.04.044 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Sujets | télédétection; végétation; inventaires de terrains; types de terrain; classement des sols; types pédologiques; géologie de l'environnement; pédologie |
| Illustrations | histograms; plots; tables |
| |
| Programme | Les 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 ID | 247415 |
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