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Variations in chemical and physical properties of Amazon Forest soils in relation to their genesis.

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According to Embrapa,these soils can be characterized as highly developed and chemically weathered. Lavras, Universidade Federal de Lavras, The amounts of poorly crystalline and free Fe and Peddologia contents were also determined by ammonium oxalate Schwertmann, and sodium dithionite citrate bicarbonate DCB extraction Coffin, The bulk density ranged from 1.

According to Ghidin et al. Soil organic carbon contents varied from 0.

The higher TOC-content in the pedoogia layer of P3 may be related to a greater input and cycling of organic material at this site. Aside from kaolinite in the clay fraction, gibbsite, goethite and titanium oxides anatase were also found at lower concentrations in the soil matrix. Levantamentos de recursos Naturais, How to cite this article.

The lowest Fe d amounts were found in P4. Bloomington, Departament of Natural Resources, The minerals present in the clay and sand fractions, as well as in the ferruginous materials were identified by X-ray Diffraction XRD. From the results, the weathering stage of these soils was assessed using the following indices: Mineralogia de solos brasileiros: Centro Nacional de Pesquisa de Solos. Iron oxides such as goethite and hematite are the major constituents of the ferruginous materials, e.


The presence of these particular iron compounds is strongly associated to the genesis process Resende et al. These soil color properties indicate a well-aerated environment at a high landscape position of both profiles.

Oxford, Oxford University Press, The lowest values were observed for P4, especially in the B 1 and B 2 horizons, suggesting low water drainage capacity of this soil. Based on these pH values, the profiles can be classified as strong to moderate acidic Embrapa, In contrast, the total iron oxide contents found in the ferruginous materials were higher than g kg -1revealing a high concentration of Fe-oxides in these ferruginous concretions, formed after a period of time of wetting and drying processes in these soil systems.

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Table of key-lines in X-ray power diffraction patterns of minerals in clay and associeted rocks. In all soils, total porosity TP increased in the deeper layers, indicating an opposite tendency to that of soil bulk density. In the well-drained profiles P1, P2, and P3the mineralogical properties are quite similar. Crystal structures of clay minerals and their X-ray identification. Physical and chemical limitations such as low water infiltration rates and natural fertility are often ascribed to these systems.


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Mineralogical properties In the well-drained profiles P1, P2, and P3the mineralogical properties are quite similar. Ntida diferena entre horizontes A e BT.

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The sand particles were separated by sieving and crushed afterwards in an agate mortar. Morphological and physical properties. Several reactions are given which demonstrate chemiluminescentDe acordo com Sistema Brasileiro de Classificao de Solos Ordem: In tropical environments, due to the high temperatures and rapid organic matter mineralization rates, the stability of organic carbon in soils is fairly low.

Selected powder diffraction data for minerals.

Rio de Janeiro, Embrapa Solos, Page2 The next step is to choose a product style from each of the following categories: