Sammendrag
Precipitation, soils and soil water in a forested catchment in western
Poland have been studied during the period 1992 - 96 (see also Vogt et
al., this conf.). The S-deposition in the area during the study period
was 2 - 3g S m-2 yr-1. In spite of decreasing anthropogenic emissions
the S-deposition in the area did not change much during the study
period mainly because the first years were exceptionally dry. However,
the S-deposition was considerably higher during the previous decade.
Based on soil water sulphate concentration, pH, acid neutralising
capacity and the ratio of Al3+/(Ca2+ + Mg2+), there is apparently an
amelioration in the conditions. A study using inter alia principal
component analysis, indicates that this improvement is mainly due to
more precipitation in the later part of the study period. Variations in
precipitation amount have a pronounced effect on the soil-water
chemistry, which makes it difficult to establish trends caused by
changes in anthropogenic deposition. Long time series are therefore
necessary to establish recovery due to reduced S-emissions.
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