A generic model of forest canopy conductance dependent on climate, soil water availability and leaf area index

作者：Andr� Granier, Denis Loustau, Nathalie Br�da · 发表于：Annals of Forest Science · 年份：2000 · DOI：10.1051/forest:2000158 · 被引用次数：329 · 研究领域：Plant Water Relations and Carbon Dynamics、Forest ecology and management、Tree-ring climate responses

This paper analyses the variation in tree canopy conductance for water vapour (g c ) in order to derive a general expression, including the effects of solar radiation (R), vapour pressure deficit (D), leaf area index (LAI) and extractable soil water.Canopy conductance was calculated from transpiration measured in 21 broadleaved and coniferous forest stands, under different climates: temperate, mountain, tropical and boreal.Common features in the dependence of g c on climate and on soil water content were exhibited.When soil water was not limiting, g c was shown to increase linearly with LAI in the range 0 to 6 m 2 m -2 and reach a plateau value.Besides the positive effect of increasing R and the negative effect of increasing D on g c , it was surprisingly shown that a decrease in extractable soil water induced a similar reduction in g c in various tree species, equally in coniferous and in broadleaved.Based on these findings, a general canopy conductance function is proposed. canopy conductance / sap flow / transpiration / species comparison / leaf area index / water stress / model / synthesisRésumé -Un modèle générique de conductance de couverts forestiers dépendant du climat, de la disponibilité en eau dans le sol et de l'indice foliaire.Ce travail réalise l'analyse des facteurs de variation de la conductance du couvert pour la vapeur d'eau (g c ) avec l'objectif d'en donner une expression générale, prenant en compte les effets du rayonnement global (R), du déficit de satur...