The concentration of Ca and Cu in the stem wood of Scots pine in the area influenced by the Narva Power Plants
2001
Ots, K. (Estonian Agricultural Univ., Tartu (Estonia). Forest Research Inst.)
In the north-eastern part of Estonia, near the city of Narva, there are two big oil-shale fueled Power Plants, the Baltic PP and Estonian PP. The main atmospheric pollutants resulting from the burning of oil-shale are fly ash, sulphur oxides and nitrogen oxides. The concentrations of Ca and Cu were measured in the stem wood of Scots pine on 4 sites in the sphere of influence of the Narva Power Plants. The stands selected for investigation were similar as to their edaphic conditions and forest survey indicators (70-80-year-old (Oxalis-) Myrtillus-type pine stands of 0.7-0.8 density and II quality class with moderately dense or sparse understorey). Using the annual rings, these core samples were divided into 5-yr sections (1945-1949; 1950-1954 etc.). The content of Ca increased and the content of Cu decreased from the youngest, outermost annual rings to the center of the stem
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