Sulphate and Nitrate in Precipitation and Soil Water in Pine Forests in Latvia |
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Authors: | E Terauda O Nikodemus |
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Institution: | (1) Faculty of Geography and Earth Sciences, University of Latvia, 19 Rainis Blvd., Riga, 1586, Latvia |
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Abstract: | The SO4–S and NO3–N concentrations and pH in bulk precipitation, throughfall, stemflow and soil water for the 1994–2004 period were studied
in pine forests in Latvia (Rucava and Taurene Integrated Monitoring stations). The SO4–S and NO3–N concentrations decreased over the study period, simultaneously with a decrease of acidity in precipitation. The changes
were more evident in the western part of Latvia, probably due to declining long-range air pollution from West Europe. The
trend of decreasing sulphate concentrations and increasing pH in precipitation were not followed by respective changes in
soil water. In the upper soil horizon sulphate ion concentrations and acidity increased in soil water. Over the observation
period, nitrate concentrations also showed an increasing trend in soil water at Rucava and Taurene, but these changes were
not statistically significant. |
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Keywords: | bulk precipitation nitrate pine forest soil water stemflow sulphate throughfall |
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