Observations on the nutrient status in air polluted urban forest stands.

[摘要] Fertilizer factory has been found to be harmful to the surrounding area through its fertilizing effect, mainly due to nitrogen compounds in the form of NO and ammonium. In this study, pH, K, Ca and Mg contents in the humus layer were monthly monitored around a fertilizer industry in Oulu, Northern Finland, in 1975 and 1976. In addition, nutrient analyses were made in the leaves ofand xVaccinium vitis-idaea, V. myrtillusEmpetrum Nigrum.Vaccinium myrtillusEmpetrum nigrum