Dieback of Norway spruce (Picea abies (L.) H. Karst) which has been observed in the Western Carpathians is of interest to scientists from many disciplines.. The aim of this study was to determine the impact of deforestation on water chemical composition in mountainous streams and springs. The research was carried out in 2004 and 2013 in two catchments of the Skrzyczne massif in the Silesian Beskid Mountains. Field studies included measurements of water pH and conductivity. Under laboratory conditions, there were determined concentrations: Na+, K+, Ca2+, Mg2+, NH4+, Cl-, NO3-, SO42 in each water sample. The results of physical and chemical analyses of water collected within the Malinowski catchment (covered mainly with spruce stands) and on northern slopes of the Skrzyczne massif - within the Czyrna catchment (covered mainly with beech stands), showed higher contents of base cations when compared to deforested areas. The highest concentrations of the ions analysed were recorded within the Czyrna catchment. Such phenomena should be taken into consideration during forest reconstruction after spruce dieback
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