Pedosphere 19(3): 292--304, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Zinc redistribution in a soil developed from limestone during pedogenesis |
C. LAVEUF1 , S. CORNU1, D. BAIZE1, M. HARDY1, O. JOSIERE1, S. DROUIN2, A. BRUAND2 and F. JUILLOT3 |
1 INRA, UR0272 Science du Sol, Centre de recherche d'Orl ans, 45075 Orl ans cedex 2 (France)
2 ISTO, UMR 6113, CNRS, Université d'Orléans, 45071 Orléans cedex 2 (France)
3 IMPMC, UMR CNRS 7590, Université Paris 6 et 7, IPGC, 75252 Paris cedex 05 (France) |
| ABSTRACT |
| The long-term redistribution of Zn in a naturally Zn-enriched soil during pedogenesis was quantified based on mass balance calculations. According to their fate, parent limestones comprised three Zn pools: bound to calcite and pyritesphalerite grains, bound to phyllosilicates and bound to goethite in the inherited phosphate nodules. Four pedological processes, i.e., carbonate dissolution, two stages of redox processes and eluviation, redistributed Zn during pedogenesis. The carbonate dissolution of limestones released Zn bound to calcite into soil solution. Due to residual enrichment, Zn concentrations in the soil are higher than those in parent limestones. Birnessite, ferrihydrite and goethite dispersed in soil horizon trapped high quantities of Zn during their formation. Afterwards, primary redox conditions induced the release of Zn and Fe into soil solution, and the subsequent individualization of Fe and Mn into Zn-rich concretions. Both processes and subsequent aging of the concretions formed induced significant exportation of Zn through the bottom water table. Secondary redox conditions promoted the weathering of Fe and Mn oxides in cements and concretions. This process caused other losses of Zn through lateral exportation in an upper water table. Concomitantly, eluviation occurred at the top of the solum. The lateral exportation of eluviated minerals through the upper water table limited illuviation. Eluviation was also responsible for Zn loss, but this Zn bound to phyllosilicates was not bioavailable. |
| Key Words: carbonate dissolution, eluviation, long-term, redox, speciation |
| Citation: Laveuf, C., Cornu, S., Baize, D., Hardy, M., Josiere, O., Drouin, S., Bruand, A. and Juillot, F. 2009. Zinc redistribution in a soil developed from limestone during pedogenesis. Pedosphere. 19(3): 292-304. |
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