Nitrification in organic and mineral soil layers in coniferous forests in response to acidity

amendement du sol b horizons calcium carbonate carbonate de calcium carbonato de calcio coniferous forests enmiendas del suelo forest soils nitrate nitrates nitratos nitrification organic horizons ph del suelo ph du sol picea abies soil amendments soil morphological features soil ph soil types suelo forestal tipos de suelos trait morphologique du sol type de sol urea uree