Mendel Laznik (email@example.com), Marina Frolova (epocl@;hma.org.lv) &
Iraida Lyulko (firstname.lastname@example.org)
Latvia Hydrometeorological Agency, LV-1019, Maskavas 165, Riga, Latvia.
Increases in atmospheric deposition in Europe resulting from air pollution may eventually lead to eutrophication or acidification. In Latvia, most of the bedrock is limestone or dolomite, so the major focus of our research is on eutrophication.
Two forested Latvian catchments, Zoseni and Rucava, were selected for participation in the UN ECE Integrated Monitoring Programme. The catchments in bedrock and forest types. The Rucava catchment is fully forested with Scotch pine, birch , and Norway spruce, while the Zoseni forest catchment is boreal forest. Input/output mass budgets for major ions and metals were calculated using bulk deposition, throughfall and runoff data. Budget calculations were performed according to the method elabourated in Finland (Forsius et al., 1995).
Output exceeded input for Na+, K+, Ca2+, SO42- and Cl-, whereas retention was observed for NH4+, NO3-, Cu, Cd, Pb, and Zn. In comparison to other forested sites in areas receiving high acid loads due to atmospheric deposition (such as Canada, Scotland, southern Scandinavia), the Latvian catchments receive rather moderate loads of acidifying compounds. Current levels of atmospheric deposition slightly exceed those reported from Finnish catchments.
Forsius, M., Kleemola, S., Starr, M. & Ruoho-Airola, T., Water, Air, Soil Pollut. 79, 19-38 (1995).
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