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| Titel |
A comparative study of the soil solution chemistry of two Amazonian forest soils (Central Amazonia, Brazil) |
| VerfasserIn |
, S. Cornu, J. P. Ambrosi, Y. Lucas, D. Fevrier |
| 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 ; 1, no. 2 ; Nr. 1, no. 2, S.313-324 |
| Datensatznummer |
250000150
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| Publikation (Nr.) |
 copernicus.org/hess-1-313-1997.pdf |
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| Zusammenfassung |
| Analyses of the chemical composition of rapidly percolating
soil water were used to study the genesis of a shallow podzol in a Campinarana forest and
a clayey ferralsol from a typical rainforest located in North Manaus (Amazonia, Brazil).
The samples were collected in lysimeters and analysed for Ca2+,
Na+, K+, NH4+, SO42-,
NO3-, Fe, Si, and Al. A large percentage of the nutrients was recycled in the
upper 40 centimetres of both soils. The soil water concentrations in nutrients were very
similar for both environments but levels of Si, Fe and AI were higher in the podzol than
in the ferralsol. In the podzolic environment, the waters were enriched in Si, Fe and AI
when passing through the organic layer and the top 10 cm of the soil. The concentrations
decreased between 10 and 40 cm depth due to variations in mineralogy of this soil. In the
ferralsol, the Si concentrations increased considerably on reaching the soil top-horizons
while small increases occurred for AI and Fe. Thermodynamic equilibrium calculations
indicate that most of the dissolved AI and Fe in both soil environments were in the form
of organometallic complexes and that the waters were under-saturated in respect to
kaolinite and gibbsite. |
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