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A comparative study of the soil solution chemistry of two Amazonian forest soils (Central Amazonia, Brazil)
1Department of Geography, The University of Reading, Whiteknights PO Box 227, Reading RG6 6AB, UK. New address: BRGM, DR/GGP, BP 6009, 45060 Orléans cedex 2, France.
2CEREGE, FR CNRS 6094, BP 80, 13545 Aix en Provence cedex 4, France.
3LEPI, UTV, BP 132, 83957 La Garde cedex, France
4LRCMO-UTV, BP 132, 83957 La Garde cedex, France
Abstract. 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.
Final Revised Paper (PDF, 1611 KB)
Citation: Cornu,, S., Ambrosi, J. P., Lucas, Y., and Fevrier, D.: A comparative study of the soil solution chemistry of two Amazonian forest soils (Central Amazonia, Brazil), Hydrol. Earth Syst. Sci., 1, 313-324, 1997. Bibtex EndNote Reference Manager
