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Kölling, Christian; Prietzel, Jörg

Correlations between Nitrate and Sulfate in the Soil Solution of Disturbed Forest Ecosystems

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  • Medientyp: E-Artikel
  • Titel: Correlations between Nitrate and Sulfate in the Soil Solution of Disturbed Forest Ecosystems
  • Beteiligte: Kölling, Christian; Prietzel, Jörg
  • Erschienen: Kluwer Academic Publishers, 1995
  • Erschienen in: Biogeochemistry
  • Sprache: Englisch
  • ISSN: 0168-2563; 1573-515X
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  • Beschreibung: <p>Based on data from three German forest ecosystems severely disturbed by windthrow events, correlation patterns between NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; and SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; dynamics in the soil solution are described. Each of the correlation types was related to site-specific SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; retention processes. The relative importance of SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; adsorption/desorption and precipitation/dissolution was found to be different for the studied soils depending on their contents of SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt;-adsorbing sesquioxides and of Al hydroxy sulfate minerals. Enhanced NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; concentrations in the soil solution resulting from excess nitrification promoted either SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; adsorption or the dissolution of Al hydroxy sulfates. Both processes result in different ecological consequences: Whereas the former reaction reduces anion concentration peaks in the soil solution, the latter increases them. Thus, a prediction of cation export from soil ecosystems subjected to excess nitrification has to regard site-specific interrelationships between NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; and SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt;. As a third type of correlation the independence of NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; and SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; concentrations in the soil solution is presented. This type is suggested to be typical for soils with low SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; adsorption capacity and absence of Al hydroxy sulfates.</p>