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Sites and soil analysis. Mineralogical properties In the pedologla profiles P1, P2, and P3the mineralogical properties are quite similar. A number of soil morphological horizon denomination and thickness, Munsell color and physical properties particle size distribution, bulk density and total porosity were also studied, using methods described by Santos et al.
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The presence of these particular iron compounds is strongly associated to the genesis process Resende et al. Lavras, Universidade Federal de Lavras, D de Janeiro, Embrapa Solos, The topographical positions of the profiles P1, P2 and P3 are higher and drainage is good. Additionally, soil samples from topsoil and subsoil horizons of each profile were also analyzed for total Fe- Al- Si- and P-content by the sulfuric acid attack Embrapa, The lowest values were observed for P4, especially in the B 1 and B 2 horizons, suggesting low water drainage capacity of this soil.
The lowest values were found for profile P1, and the highest for profile P3. The clay material was separated by sedimentation pipette method. Received for publication on September 26, Ljes on May 20, The weathering stage of these soils was assessed by means of Ki and Kr indexes, and the amounts of free and amorphous Fe and Al oxides by using dithionite citrate bicarbonate DBC and ammonium oxalate dissolution procedures, respectively.
Variations in chemical and physical properties of Amazon Forest soils in relation to their genesis.
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Keys to soil taxonomy. Geodiversidade do Estado do Amazonas. Table of key-lines in X-ray pedolohia diffraction patterns of minerals in clay and associeted rocks.
In general, soils with Ki index lower than 2. Several reactions are given which demonstrate chemiluminescentDe acordo com Sistema Brasileiro de Classificao de Solos Ordem: These values were in agreement with such a characteristic normally observed for these Amazonian soils Lima, ; Campos et al.
In the Central Amazon, these soils represent around 7. Rio de Janeiro, According to the XRD analysis, the mineralogical characteristics of these soils are quite similar. From these results, the sum of bases SBbase saturation V and cation exchange capacity CEC were computed for each profile. 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.
Pedregosidade na parte superficial. Levantamentos de recursos Naturais, Also, this profile P2 revealed a hue of 7.
Dr, other important bioclimatic factors such as high amounts of precipitation and temperatures increased leaching and nutrient depletion from the rooting zone to deeper layers, contributing to this low chemical soil quality in the region. Waterlogging and reduced water storage capacity limit the agricultural management of Plinthosols. Carter sdico ou soldico pedologiq parte Subsuperficial.
The available P contents extracted by Mehlich-1 were considered extremely low in all studied profiles. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Ntida diferena entre horizontes A e BT. Chemical properties and mineralogy of soils with plinthite and petroplinthite in Iranduba AMBrazil 1.
This chemical behavior has often been observed in the highly weathered Pedologiz soils, mainly in uplands where the variability of the mineral composition of the parent material is low Radambrasil, ; Schaefer et al. Total porosity TP was obtained by the following expression: The profile classification and soil morphological and physical properties are given in table 1.
In our study area in the Central Amazon, the occurrence oies such soils is quite frequent; however, there is still little research on their chemical and mineralogical properties. The sand particles were separated by sieving and crushed afterwards in an agate mortar. It is known that organic carbon interacts with iron oxides, and that it could consequently slow down their crystallization process in soils Schwertmann et al.