A field study on the fate of 15N-ammonium to demonstrate nitrification of atmospheric ammonium in an acid forest soil |
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| Authors: | A J M Stams H W G Booltink I J Lutke-Schipholt B Beemsterboer J R W Woittiez N van Breemen |
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| Institution: | (1) Department of Microbiology, Wageningen Agricultural University, Hess. v. Suchtelenweg 4, 6703 CT Wageningen, The Netherlands;(2) Department of Soil Science and Geology, Wageningen Agricultural University, P.O. Box 37, 6700 AA Wageningen, The Netherlands;(3) The Netherlands Energy Research Foundation ECN, P.O. Box 1, 1755, ZG Petten, The Netherlands |
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| Abstract: | To demonstrate the contribution of atmospheric ammonium to soil acidification in acid forest soils, a field study with13N-ammonium as tracer was performed in an oak-birch forest soil. Monitoring and analysis of soil solutions from various depths on the13N-ammonium and15N-nitrate contents, showed that about 54% of the applied15N-ammonium was oxidized to nitrate in the forest floor. Over a period of one year about 20% of the15N remained as organic nitrogen in this layer. The percentage15N enrichment in ammonium and nitrate were in the same range in all the forest floor percolates, indicating that even in extremely acid forest soils (pH < 4) nitrate formation from ammonium can occur. Clearly, atmospheric ammonium can contribute to soil acidification even at low soil pH. |
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| Keywords: | acidification air pollution ammonium sulfate forest soil nitrate formation nitrification |
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