Vladimír Majer & Josef Veselý

Freshwater composition in the Šumava National Park
Složení povrchových vod na území NP Šumava


Regional survey of freshwater composition in the Šumava National Park has shown exceptionally low concentrations of most compounds analysed. Mean sulphate concentrations (5.0 mg.l–1) are 1.5 to 7 times lower than in other mountainous areas of the Czech Republic. In spite of strong (85 to 90%) decrease in S emissions, long-term decrease in mean sulphate concentrations has not been observed during the past 15 years. In contrast, concentrations of nitrate and chloride have decreased in the Bohemian Forest as a consequence of reclassification of industry and decline in number of animals in agriculture. The pH range of freshwaters in the National Park has reduced. While pH of acidified freshwaters increased, pH of those with originally weakly alkaline reaction decreased. Along both main roads to Strážný and to Železná Ruda a distinct decrease in Pb and increase of chloride and Na concentrations was observed.

Key words:
freshwater, acid deposition, sulphate, nitrate, chloride, lead, Bohemian Forest

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