Pedogênese de uma seqüência de solos desenvolvidos de arenito na região de Piracicaba (SP)

Mafra, Álvaro Luiz; Silva, E. F.; Cooper, Miguel; Demattê, José Luiz Ioriatti

doi:10.1590/s0100-06832001000200012

Cited by 11 publications

(13 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Combined with that, the data on the fine sand/total sand (FS/TS) ratio between the horizons, with variation of only 0.14 and 0.12, respectively, confirmed the continuity of the same lithology, as also observed by Almeida et al (1997), Mafra et al (2001) and Bortoluzzi et al (2008). Conversely, profiles 3 and 4, which had UV of 0.62 and 2.26, and FS/TS ratios with amplitudes of 0.04 and 0.32, respectively, show the possibility of having lithological discontinuity, especially in profile 4.…”

Section: Pro Le 2 Pro Le 1 Pro Le 4 Pro Lesupporting

confidence: 85%

Planosols Developed in Different Geoenvironmental Conditions in Northeastern Brazil

Ferreira

Filho

Ribeiro

et al. 2016

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

ABSTRACT:The semiarid region of northeastern Brazil has a large area occupied by Planosols, where in the State of Pernambuco these soils are mainly used for livestock farming and subsistence crops. The knowledge on these soils is limited, which compromises the understanding on their behavior, potentialities and limitations.This study aimed to analyze morphological, chemical, physical and mineralogical attributes of Planosols developed under different geoenvironmental conditions. Morphological descriptions and chemical, physical and mineralogical analyses were performed in four profiles of Planosols along a rainfall gradient. An increase in rainfall allowed for an increase in the clay content in the Bt horizon and a reduction in ESP, EC, Na + , CEC, S, pH (water and KCl) and soil density. Horizons A and E were thicker in Planosols in more humid environments. The increase in ESP associated with the presence of expansive minerals (smectite and vermiculite) allowed the development of a prismatic structure in Haplic Planosols and a columnar structure in Natric Planosols. The mineralogical assembly is indicative of poorly weathered soils. The mineralogical assemblies of the silt and clay fractions were similar in the different geoenvironments, while higher contents of easily alterable minerals were observed in the composition of the sand fraction in environments with a drier climate.

show abstract

Section: Pro Le 2 Pro Le 1 Pro Le 4 Pro Lesupporting

confidence: 85%

Planosols Developed in Different Geoenvironmental Conditions in Northeastern Brazil

Ferreira

Filho

Ribeiro

et al. 2016

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…According to Brinkman (1970) the soil condition under successive cycles of wetting and drying favors the destruction of clay minerals by pedogenetic process of ferrolysis, resulting in horizons with low pH, low clay content and low soil CEC, these characteristics found in P3. These results are similar to those obtained by Mafra et al (2001), noting that ferrolysis is manifested in sharp acidity (pH 3.0 to 4.0) and produces sandy horizons. Also in the Cg1 horizon of P4, low pH (4.4) associated with the lower clay content and exchangeable cations, even as high exchangeable aluminum content, may indicate an initial process of ferrolysis of clays in this profile section.…”

Section: Resultssupporting

confidence: 90%

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

et al. 2015

View full text Add to dashboard Cite

Knowledge of soil characteristics in areas where activities related to the environment are developed, such as Porto Alegre Botanical Garden (JB-PoA), is a fundamental condition for the sustainable use of this natural resource. The objective of this study was to characterize, classify and evaluate some issues about soil formation in Porto Alegre Botanical Garden, as well as relate their distribution on the landscape according to environmental characteristics. For the morphological description and collecting samples four profiles were selected (P1 to P4), located in the summit-shoulder transition, backslope, footslope and toeslope, respectively. Granulometric distribution of the P1 and P3 profiles indicated sharp textural gradient, with presence of textural and "plânico" B horizons, respectively, according to Brazilian System of Soil Classification. There is predominance of low values of pH, and low base saturation, with exception of P4, indicating probable deposition of solution material at this area. The Fed/Fes relationship was greater in the profile located in the summit-shoulder transition (P1), indicating higher weathering. The Feo/Fed relationship increased in P3 and P4 profiles, indicating greater participation of iron oxides of low crystallinity in reducing environment. The occurrence of some pedogenic processes may be inferred, like lessivage in P1 (Ultic Hapludalf), due to clay skins and higher values of fine clay:total clay relationship in subsurface; ferrolysis and gleization, by low pH value and high Feo/Fed relationship in E and EB horizons of P3 (Oxyaquic Hapludalf), being the last also present in P4 (Humaqueptic Endoaquent), indicating gleization occurrence.

show abstract

“…These properties were observed in other studies conducted on this type of soil in the region of the study site (Vidal-Torrado and Lepsch 1999; Mafra et al, 2001). …”

Section: Soil Micromorphologysupporting

confidence: 84%

Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment

Bovi

Silva

Zenero

et al. 2017

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Abstract:Erosion generates large amounts of sediment, which may be deposited at the site of origin, on the slope of a hill, or along waterways. The transportability of each type of sediment by runoff and its potential for subsequent deposition largely depends on its morphological features and particle size distribution. The aim of this study is to describe and characterize the morphology and micromorphology of sediments deposited in a reforested area and to understand the dynamics of the transport process. In order to understand the sedimentation processes, the following analyses were performed: particle size distribution, with and without the use of a dispersant solution; statistical analysis of the sand fraction using Folk and Ward parameters; sediment and soil micromorphology; and two-dimensional distribution and geometry of soil horizons and sediments. The sedimentation occurred in a localized and discontinuous manner and in the lowest parts of the landscape. The sediments were generated by low intensity erosive events producing well-sorted sediments and the clay in these deposits was transported mainly in the form of silt-sized clay aggregates. Microscopic analysis of the sediments was important for clarifying the genesis and transport dynamics of the sedimentary deposits.

show abstract

Pedogênese de uma seqüência de solos desenvolvidos de arenito na região de Piracicaba (SP)

Cited by 11 publications

References 25 publications

Planosols Developed in Different Geoenvironmental Conditions in Northeastern Brazil

Planosols Developed in Different Geoenvironmental Conditions in Northeastern Brazil

Soil Variability in Different Landscape Positions in the Porto Alegre Botanical Garden, Southern Brazil

Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment

Contact Info

Product

Resources

About