Author: G. Wallner 1
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  • 1 Institut für Anorganische Chemie der Universität Wien Währingerstraße 42 A-1090 Vienna Austria
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Up to 14 elements were determined by NAA in tree rings of Norway spruce trees from two sites which differed in their degree of human disturbance mainly caused by phytotoxic SO2 pollutions. The aim of this study was to identify elements that might be useful to indicate environmental stresses. Significant site differences were found with Mn by finding high Mn concentrations and Mn accumulation rates as well as Mn/Ca ratios at the heavily polluted sites. This might indicate a long term soil pH change due to acid deposition. These results correspond well with data from the literature which also indicate Mn in xylem being a key index element for the health status of the tree.