EN
The paper concerns changes of chemical composition of water in headwater streams in the valley of the Kamienna, left bank tributary of the Słupia River (54°19′N; 17°10′E). Water samples were collected in 2012 from three streams, in their upper, middle and lower course every month. Analysis included water temperature, pH, conductivity, and the content of dissolved oxygen, HCO3– , K+, Na+, Ca2+, Mg2+, NH4+, Cl–, NO3–, PO43– and SO42–. Water of the analysed streams was characterized by generally low concentration of solutes (tab. 1) and had bicarbonate−calcium character. The observed low variability of water temperature along the streams resulted from their shortness and rapid flow. Low variability was also observed in case of pH and Mg2+ content. Increasing trends downward the streams were noticed for dissolved oxygen, while decreasing changes were observed for HCO3–, NO3– and PO43–. The remaining components showed different trends in the individual streams, indicating importance of local−scale factors.