Relations sols-composition floristique dans les forêts de la Semois ardennaise. (Soils and forest vegetation of the Semois valley (Belgian Ardennes))
Three silicicolous forest associations of the Semois valley. The chemical charateristics of the humus layers are compared with special attention to acidity, cationic composition of the exchange complex and exchangeable aluminium content.
Detailed morphological, physical and chemical analysis of a sequence of soil profiles allows to explain an acidification gradient which is rather unusual on limestone and corresponds to a continuum of forest types whose extremes belong to the Carici