Nitrate wash off from the Bratislava forest park basin Vydrica in years 1986-2005
2007
Sebíň, M., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology | Pekárová, P., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology | Miklánek, P., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology
In the model catchment Vydrica brook in Small Carpathians (mostly beech forest), concentrations of the selected chemical substances were monitored for evaluation of the land use impact upon the brook water quality. Concentrations of these substances were monitored within the years 1991-1993. In order to evaluate also a development of the long-term trend of the observed data, we are continuing in their monitoring since 2004. In this paper there are evaluated nitrate concentrations from two localities: in the upper Vydrica part (Spariská), and on the Bratislava city area limit (Červený Most), in the Vydrica lower part. The mean nitrate concentration in 1991-1993 at Spariská was 14.54 mg per l, at Červený Most locality 10.84 mg per l, in the years 2004-2005 the mean concentration at Spariská it was 11.85 mg per l, and 9.36 mg per l at Červený Most. From the observed data it follows that in the 2004-2005 years the nitrate concentration dropped in comparison with the 1991-1993 period. As there was a significant relationship documented between the nitrate concentration and discharge, the empirical relationships were developed for estimating of daily nitrate concentration values based on the mean daily discharges, for the 1987-2005 periods. From these, then the mean monthly and yearly nitrate wash offs were calculated from the unit area. So for the Spariská subcatchment the mean yearly nitrate wash off range was 15.42 to 102.37 kg per ha per year, for the profile Červený Most it was 9.01 to 70.53 kg per ha per year.
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