[Deposition and effects from acidifying compounds, sulphur and nitrogen in the southern and central parts of Sweden October 1992 - September 1993]

acid rain agua del suelo air pollution arable soils arbre forestier azote azufre carga contaminante charge polluante data collection eau du sol environmental impact assessment forest land forest trees monitoring nitrogen ph pluie acide pollutant load soil water sol arable soufre suecia suelos cultivables sulphur sweden terrain forestier tierras forestales vigilancia