Evaluation of the concentration of inorganic nitrogen forms in the National nature reserve Čičov oxbow

Abstract

The aim of this study was to evaluate of concentrations of nitrate, ammonium and nitrite nitrogen in the water of National Nature Reserve Čičov oxbow during the years 2010 – 2013. The average concentration of nitrate nitrogen in water of National Nature Reserve during the whole monitored period was 3.42 mg*dm-3. Maximum average concentration for the whole monitored period in the month of March and minimum in the month of November was found. Depending on the sampling sites it’s the highest average concentrations were recorded in the first side distributary and the sampling place located in the northeastern part of the national nature reserve. Minimum average concentrations of N-NO3- were recorded at sampling sites located in the first and second side distributary of reservation with the low water level. The average concentration of ammonia nitrogen during the whole monitored period was 0.15 mg*dm-3. The highest average concentrations of N-NH4+ for the entire period were in summer period with maximum in month of June and minimum in month of February. Depending on the sampling place its highest average concentrations were in the sampling points located near the mouth of the Čiližsky channel in the northeastern part of reserve. The lowest average concentrations in the sampling point that was located at the first side distributary were measured. The average concentration of nitrite nitrogen during the whole monitored period represented 0.04 mg*dm-3. The lowest average concentration of N-NO2- for the entire monitored period was in month of January and the highest was in month of July. In terms of sampling place in all sampling sites during the entire period the same average concentration of nitrite nitrogen (0.04 mg*dm-3) was measured.