Mise en place d’un îlot de sénescence : enquête sur des préconisations possibles et estimation du coût

In this article, the topic of extended rotation stands is contemplated from several angles so as to consider the practical aspects seen from the point of view of the naturalist and manager, and the economic aspects. Two regions were investigated: Alsace and Rhone Alps. Guidelines for establishing extended rotation stands in mountain forests were identified on the basis of the survey conducted among foresters and naturalists. The results indicate that the stands chosen should be the most mature ones, located on a variety of sites and avoiding any interference with logging operations. An assessment of the costs of extended rotation schemes in high forests was performed for beech trees in Alsace. The figures obtained are directly dependent on the assumptions used and on the values of the parameters. These figures may usefully serve to compare different investment plans but their relevance is modest particularly since ecological gains are not considered.