[Acid and nitrogen loads - a risk for Swiss forests?]

acid deposition air pollution aluminio aluminium azote castanea sativa chimie du sol environmental policies forest dieback forest ecology forest inventories forest pathology forest soils inventaire forestier inventarios forestales lutte antipollution marchitez del bosque nitrogen nutrition des plantes ph del suelo ph du sol picea abies plant nutrition politique de l'environnement pollution control pollution du sol soil chemistry soil ph soil pollution suelo forestal