Presja azotogenna fermy norek na las

The paper verifies the hypothesis about the cause−effect relationship of forest decline, on the basis of the observed retreat of the forest edge line from a mink farm contaminating the nearby soils with excessive mineral nitrogen concentrations. Soil analyses were carried out along with an analysis of elemental composition of pine needles which showed and increased content of nitrogen exceeding the tolerance threshold level for the occurrence of mycorrhizal associations.