Stand history and its consequences for the present and future dynamic in two silver fir (Abies alba Mill.) stands in the high Pesio Valley (Piedmont, Italy)

Deux peuplements representatifs de sapiniere de la Haute Vallee du Pesio ont ete identifies dans des zones abandonnees de forets qui etaient fortement exploitees. Les deux peuplements ont ete choisis pour etudier les effets de l'utilisation historique du territoire sur la dynamique et la composition de la foret. En mettant en relation les analyses de croissance, le recrutement de feuillus pionnieres et les donnees de documents historiques, nous avons reconstruit l'histoire de ces peuplements. Les deux peuplements sont relativement jeunes et ont ete fortement exploites pendant le dernier siecle jusqu'a la creation du Parc Naturel (1970). Le recrutement maximum a ete identifie en 1940 pour le peuplement 1 et en 1975 pour le peuplement 2. L'exploitation forestiere et le recrutement de feuillus ont ete suivis par la fermeture du couvert. C'est seulement durant les deux ou trois dernieres decennies que les deux peuplements ont pu se developper naturellement. Aujourd'hui, le sapin est en train de regagner sa place mais dans le futur, il devra vraisemblablement partager l'etage superieur avec les feuillus mesophiles comme l'erable (Acer pseudplatanus L.) et le hetre (Fagus sylvatica L.) meme si le futur statut de ces peuplements n'est pas encore exactement etabli.

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