Organic and inorganic nitrogen in precipitation and in forest throughfall at Bily Kriz site (Beskydy Mts., Czech Republic)
2012
Drapelova, I., Mendelova Univ., Brno (Czech Republic). Ustav Ekologie Lesa
Organic nitrogen is an important but yet not very well explored component of nitrogen deposition. In this study concentrations and fluxes of organic and inorganic N in bulk precipitation in an open field (BOF) and in throughfall (THR) were evaluated at the Bily Kriz experimental site (Moravian-Silesian Beskydy Mts., Czech Republic, 908 m a.s.l.) with a young Norway spruce stand. The results of a two-year study (2008 and 2009) were compared with the results obtained during the same time period on forest plots included in ICP Forests Programme in the Czech Republic. Total N deposition in BOF at the Bily Kriz site amounted to about 918 mg/square m/a, the contribution of organic nitrogen was about 8%. Total N flux with THR was about 1,305 mg/square m/a during the studied years and organic N accounted for 12% of this amount. The ranges of the two-year average values found for total N flux on ICP Forests plots throughout the Czech Republic were as follows: 759-1,857 mg N/square m/a with 7-38% contribution of organic N in BOF and 928-3,816 mg N/m/a with 7-20% contribution of organic N in THR. The share of organic N in THR nitrogen fluxes proved clear seasonality with maxima in July. A highly significant correlation between N-NH4+ and N-NO3- concentrations in BOF suggested the common anthropogenic source of these substances. No significant correlation was found either between organic N and N-NH4+ or between organic N and N-NO3- concentrations in BOF. Cumulative deposition charts showed different behaviour of particular N deposition components while passing through the canopy.
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