Trend assessment of deposition, throughfall and runoff water chemistry at the ICP-IM station Kosetice, Czech Republic

摘要

Long-term monitoring and research activities in a small forested catchment are a part of the integrated monitoring programme of Kosetice Observatory (Czech Hydrometeorological Institute). The Observatory was established as a station specializing in problems of regional environmental quality in 1988 and is involved in several long-term international programmes (ICP-IM, EMEP, GAW, EUSAAR). The results show that reducing sulphur emissions in the Czech Republic has entailed a decrease in the background sulphur deposition. A distinct reduction of sulphur input was reflected in the sulphur balance of the catchment. In the beginning of the 1990s retention predominated, but since 2000 leaching has been found. The level of pH in precipitation water increased continuously during the period 1990-2003. The upward tendency was stopped after 2003. In the rest of the period under review the pH values varied between 4.5 and 5 and the differences between measurements in open areas and under the canopy were smaller.