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Are there signs of acidification reversal in freshwater of the low mountain ranges in Germany?


Alewell, Christine ; Armbruster, Martin ; Bittersohl, Jochen ; Evans, Christopher D. ; Meesenburg, Henning ; Moritz, K. ; Prechtel, Annette:
Are there signs of acidification reversal in freshwater of the low mountain ranges in Germany?
In: Hydrology and Earth System Sciences. Bd. 5 (2001) Heft 3 . - S. 367-378.
ISSN 1607-7938
DOI: https://doi.org/10.5194/hess-5-367-2001


The reversal of freshwater acidification in the low mountain ranges of Germany is of public, political and scientific concern, because theseregions are near natural ecosystems and function as an important drinking water supply. The aim of this study was to evaluate the status andtrends of acidification reversal after two decades of reduced anthropogenic deposition in selected freshwaters of the low mountain ranges inthe Harz, the Fichtelgebirge, the Bavarian Forest, the Spessart and the Black Forest. In response to decreased sulphate deposition, seven outof nine streams investigated had significantly decreasing sulphate concentrations (all trends were calculated with the Seasonal Kendall Test).The decrease in sulphate concentration was only minor, however, due to the release of previously stored soil sulphur. No increase was foundin pH and acid neutralising capacity (defined by Reuss and Johnson, 1986). Aluminum concentrations in the streams did not decrease. Thus,no major acidification reversal can currently be noted in spite of two decades of decreased acid deposition. Nevertheless, the first signs ofimprovement in water quality were detected as there was a decrease in the level and frequency of extreme values of pH, acid neutralisingcapacity and aluminium concentrations in streams. With respect to nitrogen, no change was determined for either nitrate or ammoniumconcentrations in precipitation or stream water. Base cation fluxes indicate increasing net loss of base cations from all ecosystems investigated,which could be interpreted as an increase in soil acidification. The latter was due to a combination of continued high anion leaching andsignificant reduction of base cation deposition. No major improvement was noted in biological recovery, however, initial signs of recoverywere detectable as there was re-occurrence of some single macroinvertebrate species which were formerly extinct. The results of this studyhave important implications for water authorities, forest managers and policy makers: the delay in acidification reversal suggests a need forongoing intensive amelioration of waters, a careful selection of management tools to guarantee sustainable management of forests and thereduction of nitrogen deposition to prevent further acidification of soils and waters.Keywords: freshwater, acidification reversal, drinking water supply, forested catchments, Germany

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER9507
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 09 Okt 2015 05:56
Letzte Änderung: 09 Okt 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20260