Forest Condition in Europe - ICP Forests

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64 Forest Condition in Europe 2013 -1 a -1 /a) is the estimator for the absolute trend resulting from the trend analyses and mean (he mean value of the time series. The relative slope was plotted against the p-value to investigate patterns that may be used to define a minimal detectable trend for deposition data. 4.4. Results 4.4.1. Current deposition Mean annual throughfall (TF) and bulk deposition (BD) of sulphur and nitrogen was calculated for 289 and 357 plots with at least one of the years 2008, 2009 and 2010 meeting the mentioned completeness criteria (Figures 4.4.1-1 and 4.4.1-2). High sulphur deposition has been measured in northern central Europe especially in a region covering Belgium/Netherlands, Central Germany, Czech Republic and Poland, as already mentioned by Granke et al. (2010), reaching up to the southern Baltic and the Central Hungarian area. Furthermore, high values have also been found in some Mediterranean regions in Spain, France, Southern Italy and Greece. Higher values in throughfall than bulk deposition confirm that sulphur is filtered from the air by the tree canopies. High sulphur depositions along the coast mostly occur with high Cl deposition, which is typical for sulphur that originates from sea salt. Figure 4.4.1-1 Mean annual sulphate sulphur (SO 4 - -) bulk and throughfall deposition during the period from 2008 to 2011.
Forest Condition in Europe 2013 65 Figure 4.4.1-2 Mean annual nitrate (NO 3 — N) and ammonium (NH 4 + -N) bulk and throughfall deposition during the period from 2008 to 2011. High nitrogen deposition is also recorded in northern central Europe, as for sulphur, but extends further to the South down to southern Germany and the Swiss Plain, as observed in ear-
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International Co-operative Programm
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United Nations Economic Commission
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Forest Condition in Europe - ICP Forests

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