Standardsignatur
Titel
Risk Assessment of Air Pollutants for Forested Areas in Austria, Bavaria and Switzerland
Verfasser
Erscheinungsjahr
1998
Seiten
S. 25-37
Illustrationen
2 Abb., 3 Tab., 31 Lit. Ang.
Material
Unselbständiges Werk
Datensatznummer
200101946
Quelle
Environmental Science and Pollution Research. International 1998, 5(1) ; No. 1, special issue, S. 25-37
Abstract
Long-term measurements in forested areas (71 evaluated measuring stations in Austria, Bavaria, Switzerland and Italy), especially in the Alps, showed that O3 continues to be a particularly serious pollutant for sensitive tree species, e.g. Fagus sylvatica and Pinus sylvestris. The annual mean values extend to 50 ppb with the maximum at the timberline. Effect-related limit values (e.g. the AOT40) are exceeded to a high degree. In contrast to NO2, concentrations of SO2 have decreased as a consequence of reduced emissions. Individually, they do not represent an acute danger for forest stands, except for those under the immediate influence of pollutant sources. VOCs do not occur in phytotoxic concentrations apart from respective emittors, except in the immediate proximity of emittors. Depositions were evaluated for 48 measuring plots in Austria. The inputs of proton depositions (kleiner gleich 0,45 kg ha-Üa-Ü) represent a risk only on poorly buffered soils, but not in the calcareous Alps. Wet nitrogen depositions (in most cases kleiner gleich 20 kg ha-Üa-Ü) frequently exceed the Critical Loads on sensitive sites.