... (Pseudotsuga menziesii F.) o n the chemical composition of soil solutions and on the leaching of DOC and ions in drainage watersJacques R*,SylvainL, Dominique G, Benoợt P, Pascal BINRA Centre ... 70-year-old Douglas-fir plantation on the chemical composition of soil solutions and on leaching of nutrients in drainage waters were observed by a continuous monitoring, six years before and three years ... species, a shortening of rotations and a mechani-sation of the thinning, harvesting and regeneration operationsresult in constraints to the physical, chemical and biologicalproperties of the soil...