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Effects of reduced nitrogen and sulphur deposition on the water chemistry of moorland pools |
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| Authors: | Hein H van Kleef Emiel Brouwer Herman van Dam Gerard van der Velde |
| Institution: | a Bargerveen Foundation, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands b Radboud University, Institute for Wetland and Water Research, Department of Environmental Science, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands c B-WARE Research Centre, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands d Water and Nature Consultant, P.O. Box 37777, 1030 BJ Amsterdam, The Netherlands e Radboud University, Institute for Wetland and Water Research, Department of Animal Ecology and Ecophysiology, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands |
| Abstract: | To assess changes as a result of reduced acidifying deposition, water chemistry data from 68 Dutch moorland pools were collected during the periods 1983-1984 and 2000-2006. Partial recovery was observed: nitrate- and ammonium-N, sulphur and aluminium concentrations decreased, while pH and alkalinity increased. Calcium and magnesium concentrations decreased. These trends were supported by long term monitoring data (1978-2006) of four pools. Increased pH correlated with increases in ortho-phosphate and turbidity, the latter due to stronger coloration by organic acids. Increased ortho-phosphate and turbidity are probably the result of stronger decomposition of organic sediments due to decreased acidification and may hamper full recovery of moorland pool communities. In addition to meeting emission targets for NOx, NHx and SOx, restoration measures are still required to facilitate and accelerate recovery of acidified moorland pools. |
| Keywords: | Acidification Recovery Internal eutrophication Restoration |
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