Changes in heavy metal contents in an acidic forest soil affected by depletion of soil organic matter within the time span 1969-93

acid soils aluminio aluminium cadmio cadmium carbon carbone carbono chemical composition chimie du sol cinc composition chimique fer forest soils heavy metals hierro iron lead manganese manganeso measurement mesure metales pesados monitoring plomb plomo pollution pollution du sol soil chemistry soil organic matter soil pollution soil types sol acide subsoil subsuelo suelo forestal tipos de suelos type de sol vigilancia zinc