Nutrient loading and retention in lakes of the Jorka river system (Masurian Lakeland, Poland): seasonal and long-term variation
2002
Hillbricht-Ilkowska, A. (Polish Academy of Sciences, Dziekanow Lesny (Poland). Inst. of Ecology, Dept. of Hydrobiology)
External nutrient loading was assessed over several years for five lakes (mostly shallow and eutrophic) located in the catchment basin (area 65 square km) of the river-lake system typical of a lakeland region (the Jorka river system). The discharge and concentration of TP, TKN (organic and ammonium nitrogen) and N-NO3 were measured montly in the river input to and outflow from successive lakes, in surface runoff (monitored streams, from direct, active lake subcatchments, and in precipitation, for the periods April-October of 1978
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