1. Forest Ecology and Ecophysiology Unit; INRA; Lorrain University; F-54280; Champenoux; France
2. Inventaire Forestier National; Place des Arcades; BP 1001 Maurin; F-34972; Lattes; France
3. Inventaire Forestier National; 14 rue Girardet - CS 4216; F-54042; Nancy Cedex; France
4. Météo-France; Direction de la climatologie; 42, avenue Gaspard Coriolis; F-31057; Toulouse Cedex; France
5. Institute of Geobotany; Leibniz University of Hannover; Nienburger Str. 17; D-30167; Hannover; Germany