Résumé
Forest ecosystems assure functions and supply services that are fundamental for human well-being. The sustainable management of forest systems based on a multifunctional approach is an important way of contributing locally and globally to the supply of wood for industry but also of non-woody products to (e.g. wild mushrooms, berries), to the conservation of natural resources (e.g. soil, water, biodiversity) and cultural heritage (e.g. scenery, traditions), and to the regulation of ecological processes (e.g. carbon sequestration, erosion). The preferences of society, however, may favour demand and supply of particular forest goods or services causing the decline of other (trade-off) or may favour demand and supply of several services simultaneously (synergy). In this work we evaluated the interactions between demand and the supply of two provisioning ecosystem services – production of wood for energy and wild mushrooms - in maritime pine stands in north-eastern Portugal. Biomass for energy and mushrooms production are services currently increasing in importance due to the expansion of local and international markets. The assessment was done using AppTitude® to address spatially and economically demand and supply of these services in a heuristic model under different scenarios. AppTitude® combined three kind of models in his assessments: i) value or spatial suitability models, ii) price models and iii) quantity models. The results show possible conflicts and synergies between these two ecosystem services as well as the spatial distribution of supply variability due to forest management followed in maritime pine stands.