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| Titel |
Increasing silicon concentrations in Bohemian Forest lakes |
| VerfasserIn |
J. Vesely, V. Majer, J. Kopáček, J. Safanda, S. A. Norton |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 9, no. 6 ; Nr. 9, no. 6 (2005-12-31), S.699-706 |
| Datensatznummer |
250007149
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| Publikation (Nr.) |
 copernicus.org/hess-9-699-2005.pdf |
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| Zusammenfassung |
| Long-term trends of dissolved silicon (Si) concentrations in five glacial
lakes in the Bohemian Forest, Czech Republic, recovering from acidification
show higher mobility of Si from the soil to surface waters despite lower
atmospheric deposition of acids. Si increased by 0.95 to
1.95 µmol yr-1 (36 to 51%) from 1986-2004 and with increasing
pH. A change in soil solution conditions because of a sharp decrease in
acidic deposition has led to marked decline in Al mobility and to
considerable decreases in dissolved Al, especially Al3+. The increase in
Si may be related to: (1) unblocking of the inhibitory effect of dissolved Al
on weathering of aluminosilicates, (2) biogenic opal (phytoliths) dissolving
faster, and/or (3) lower Si precipitation as secondary aluminosilicates in
soil. The change in Al speciation on the dissolution rate of biogenic silica
is critical. A lack of change in Si at sites outside central Europe may be
explained by small or no decline in mobility of dissolved Al. The effect of a
long-term increase in temperature was probably minor. |
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