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PCDD/F and PCB in spruce forests of the Alps |
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| Authors: | I Offenthaler R Bassan G Jakobi N Kräuchi K-W Schramm P Simon?i? P Weiss |
| Institution: | a Austrian Environment Agency, Spittelauer Lände 5, 1090 Vienna, Austria b Regional Agency for Environmental Prevention and Protection of Veneto, Italy c Regional Agency for Environmental Protection of Lombardia, Italy d Helmholtz Zentrum München (German Research Centre for Environmental Health), Germany e WSL-Swiss Federal Institute for Forest, Snow and Landscape Research, Switzerland f Slovenian Forestry Institute, Slovenia |
| Abstract: | PCDD/F and PCB concentrations in remote mountainous spruce stands of the Central European Alps show strong geographic variation. Independent of the matrix (0.5 year old needles, humus or mineral soil), the highest pollutant levels were always found at the lateral zones of the mountain range. High levels coincided with strong precipitation, particularly along the northern margin of the study region. The most volatile PCB congener propagated farther into the colder, drier central Alps than the heavier species. Matrices with different accumulation history (needles and humus) repeatedly reflected different spatial immission patterns. Consistent with its much longer exposure, pollutant levels in humus exceeded those of needles by up to two orders of magnitude. Needle contamination varied with altitude but the vertical trends were highly variable between transsects and changed between years, too. |
| Keywords: | Dioxin PCB Alps Forest Soil Picea abies |
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