Crown condition of Norway spruce in relation to sulphur and nitrogen deposition and soil properties in southeast Norway

acid deposition acidez acidity aluminio aluminium ammonia ammoniac azote azufre cation cationes cations chimie du sol copa crown densidad density forest decline forest pathology houppier leaching lessivage du sol monitoring nitrate nitrates nitratos nitrogen noruega norway ph del suelo ph du sol picea abies soil chemistry soil ph soil toxicity soufre sulfate sulfatos sulphates sulphur toxicidad del suelo vigilancia