Article révisé par les pairs
Résumé : Previous investigations had shown that about 80 years of Norway spruce monoculture on an ochreous brown earth of the Belgian Ardennes were sufficient to accentuate the weak podzolization process already present in the climax beechwood soil and to increase the weathering of several minerals, eg 2:2 clay minerals. In order to evaluate more accurately mineral weathering and spruce-induced losses of nutrition element, an isoquartz assessment method has been applied to a pair of soil profiles, one developed under beech, the other under spruce. Results show a clear decrease of several weatherable minerals in the soil of the spruce stand which was more marked than in the beechwood, especially for chloritic minerals. -from Authors