Disturbances in water relations of European beech during an extreme drought
Marianne PEIFFER, Nathalie BRÉDA, Vincent BADEAU, André GRANIER
INRA, UMR 1137 Ecologie et Ecophysiologie Forestières, 54280 Champenoux, FranceVisit the Annals of Forest Science Website to download the paper
In the context of a probable increase in intensity and frequency of extreme summer drought events, a better understanding of the key processes involved in water relations is needed to improve the theoretical foundations of predictive process-based models.
This paper aims to analyse how temperate deciduous trees cope with water shortage. The exceptional summer drought of 2003 in Europe provided an opportunity to monitor stomatal conductance and twig water potential in European beech (Fagus sylvatica L.) at predawn and midday and to analyse variations with respect to leaf height within the canopy. By comparing our field measurements of twig water potential to values found in the literature, we confirmed the strong impact of soil water shortage on crown water relations.
Keywords
Fagus sylvatica, Stomatal conductance, Leaf water potential, Soil water deficit, Crown position, Seasonal pattern