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| Titel |
Rates of biogeochemical phosphorus and copper redistribution in young floodplain soils |
| VerfasserIn |
F. Zehetner, G. J. Lair, M. Graf, M. H. Gerzabek  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-10), S.2949-2956 |
| Datensatznummer |
250004223
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| Publikation (Nr.) |
 copernicus.org/bg-6-2949-2009.pdf |
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| Zusammenfassung |
| Nutrients and trace metals in river-floodplain systems may originate from
anthropogenic activities and/or geogenic sources. Here, we analyze a soil
chronosequence (2 to approximately 600 years) on a floodplain at the Danube
River (Austria) to quantify the rates of P and Cu redistribution among
biogeochemical pools during early soil formation under temperate continental
climate. While bulk and clay mineralogy remained unchanged over the studied
age gradient, we found considerable (mostly non-linear) redistribution of P
and Cu among biogeochemical pools. The calcium-associated P and Cu fractions
decreased rapidly during the initial decades of soil formation. The
dissolution of calcium-associated P was mirrored by marked accumulation of
organic P. Copper incorporated within resistant minerals showed a relative
enrichment with soil age. The mean dissolution rates of calcium-associated
(primary mineral) P decreased exponentially with increasing soil age from
~1.6 g m−2 yr−1 over ~15 years to ~0.04 g
m−2 yr−1 over ~550 years, and were almost an order of
magnitude higher than rates reported for tropical environments. Our study
demonstrates that on riverine floodplains, rapid biogeochemical
transformations can occur within the first centuries of soil formation under
temperate climatic conditions. |
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