“…It has now become an experimental basin (Hydro Geochemical Observatory of the Environment, http://ohge.u-strabg.fr) used to study and characterize hydrogeochemical mechanisms in forested ecosystems, using the geochemistry of major and trace elements, as well as various isotopic systems such as B, Ca, Sr, U-Th (Aubert et al, 2002b(Aubert et al, , 2004Cividini et al, 2010;Dambrine et al, 1998b;El Gh'mari, 1995;Probst et al, 1990Probst et al, , 2000Probst et al, , 1995Probst et al, , 1992Fichter et al, 1998b;Riotte and Chabaux, 1999). On two experimental plots (VP under spruce and HP under beeches on Fig.…”