Formas De Ferro, Silício E, Ou, Alumínio Na Gênese De Fragipãs E Horizontes Coesos Dos Tabuleiros Costeiros

Corrêa, Marcelo Metri; Ker, João Carlos; Filho, José Coelho de Araújo; Camêlo, Danilo de Lima

doi:10.1590/01000683rbcs20140679

Cited by 6 publications

(18 citation statements)

References 16 publications

(11 reference statements)

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Section: Ph and Contents Of Fe Al And Si In Different Extractions Asupporting

confidence: 73%

“…Therefore, the results observed reinforce the generalized importance of Al compounds with a low degree of crystallinity in the genesis of ortstein, fragipan, and duripan horizons in coastal tableland soils (Araújo Filho, 2003;Lima Neto et al, 2010;Corrêa et al, 2015). However, they also demonstrate that Fe and Si compounds with a low degree of crystallinity also take part in the process to a varied extent, an aspect which was also pointed out by Corrêa et al (2015). Some hypothesis can explain the origin of Si acting in the genesis of these horizons: dissolution (by hydrolysis) of kaolinite, which is accelerated by the local redoximorphic conditions, being translocated downwards into the pedon (Duncan and Franzmeier, 1999); lateral transport, originating from soils (mainly Argissolos Amarelos and Latossolos Amarelos) that occur in the surroundings of the gentle depressions of the landscape (Moreau et al, 2006;Oliveira et al, 2010); and weathering of very small size quartz (Resende et al, 1988).…”

Section: Ph and Contents Of Fe Al And Si In Different Extractions Asupporting

confidence: 70%

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Cemented Horizons and Hardpans in the Coastal Tablelands of Northeastern Brazil

Gomes

Filho

Vidal‐Torrado

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:Horizons with varying degrees of cementation are a common feature of the soils from the coastal tablelands of Northeastern Brazil. In most cases, these horizons are represented by the following subsurface horizons: fragipan, duripan, ortstein, and placic. The aims of this study were to analyze differences regarding the development and the degree of expression of cementation in soils from the coastal tablelands of Northeastern Brazil: Planossolo Háplico (p-SX), Espodossolo Humilúvico (p-EK), Espodossolo Ferrihumilúvico (p-ESK), and Argissolo Acinzentado (p-PAC) pedons. The pedons studied displayed features related to drainage impediments. The cemented horizons from p-SX and p-EK had the same designation (Btgm), displaying a duric character that coincided with gleization features and are under podzolized horizons. In the p-ESK, the podzolization process is of such magnitude that it leads to the cementation of its own spodic horizons, which were both of the ortstein type (Bhsx and Bsm). In the p-PAC cementation is observed in two placic horizons and in the Btx/Bt horizon, as well as in the upper parts of the Bt/Btx horizon. Analysis of the micrographies from the cemented horizons showed predominance of a low porosity matrix. Such porosity is relatively greater in the horizons of "x" subscript than in the horizons with duric character. The Fe segregation lines were notable in the cemented horizons from p-EK and p-PAC, which corroborates the presence of placic horizons in such pedons. The preponderance of kaolinite in the clay fraction was widely verified in all the cemented horizons analyzed. Water immersion tests were the criteria adopted to define the duric character of the Btgm horizons from p-SX and p-EK, and in the Bsm horizon from the p-ESK. These tests were also used to confirm field morphology. In most cases, the maximum values of Fe, Al, and Si, determined by different extractions, occurred in positions overlaying the cemented horizons, whether they were spodic or not. The extracts of the aqueous solution displayed a noticeable accumulation of Si in the cemented horizons, except in the p-PAC. The presence of argillans in all cemented horizons allows them to be defined as illuvial, with the exception of the placic horizons, regardless of the presence of podzolization processes. The cemented horizons were preponderantly apedal, with a matrix of little porosity. The Fe, Al, and Si contents extracted by acid ammonium oxalate were effective at highlighting the influence of compounds with a low degree of crystallinity in the morphology of cemented horizons.

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Section: Ph and Contents Of Fe Al And Si In Different Extractions Asupporting

confidence: 73%

Section: Ph and Contents Of Fe Al And Si In Different Extractions Asupporting

confidence: 70%

Cemented Horizons and Hardpans in the Coastal Tablelands of Northeastern Brazil

Gomes

Filho

Vidal‐Torrado

et al. 2017

Rev. Bras. Ciênc. Solo

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“…These characteristics define cohesive soils (SANTOS et al, 2018). Cohesive soils are usually found in Yellow Ultisols and Oxisols in Coastal Tablelands (CORRÊA et al, , 2015DANTAS et al, 2014;LIMA NETO et al, 2009;MOREAU et al, 2006). Studies reported that these characteristics reduced the vertical flow of water (CORRÊA et al, , 2015LIMA NETO et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…Because of the nature of the parent material (pre-weathered sediments of the Barreiras Formation), the typical soils of Coastal Tablelands are very deep and weathered, and usually well drained. However, small relief variations affect water drainage and surface flow, contributing to the formation of hardened pedogenic horizons, including fragipan (weak cementation) and duripan (strong cementation), which may contain cementing agents such as Fe, Si, and/or Al (CARVALHO et al, 2013;CORRÊA et al, 2015;FILIZOLA et al, 2001;MOREAU et al, 2006). Hardened horizons limit water percolation in depth, limiting water drainage in deeper areas of the landscape.…”

Section: Introductionmentioning

confidence: 99%

“…The physical and chemical limitations of these soils warrant implementing adequate land use and management systems. The limitations include the occurrence of cohesive pedogenic horizons, sandy texture, low cation exchange capacity and consequent low natural fertility, and the presence of hardened pedogenic horizons (CORRÊA et al, , 2015LIMA NETO et al, 2009). Yellow or Gray Ultisols and Spodosols are common in the Coastal Tablelands of the state of Paraíba, particularly in the north of the municipality of João Pessoa (BRASIL, 1972;COELHO et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Pedogenesis on Coastal Tablelands Area With Low Range Altimetry in Paraíba State

et al. 2019

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Small variations of relief may change drainage and runoff and hence promote the formation of sandy surface horizons and hardened subsurface horizons (fragipans and/or duripans) in Coastal Tablelands soils. This study aimed to investigate the pedogenesis on Coastal Tablelands area with low range altimetry in Paraíba state; secondly, we also sought to contribute to the improvement of the Brazilian Soil Classification System (BSCS). Four soil profiles ware described and collected to be submitted to routine physical and chemical analysis, determination of Fe, Al and Si extracted by sulfuric acid digestion, sodium citratebicarbonate-dithionite and acid ammonium oxalate, sodium pyrophosphate, and mineralogical analysis in the sand and clay fractions by X-ray diffractometry. Optical density of the oxalate extract (ODOE) was also determined; the results were statistically evaluated using the R software. Microrelief variations conditioning differentiated water flows, along with the sandy texture of the surface horizons (A and E) and the lower coarse sand/fine sand ratio in the subsurface horizon, seem to promote clay accumulation in depth in the Spodosols developed on Coastal Tablelands environments. For this soils, the argilluvic (argissólico) character at the subgroup level of the BSCS should be incorporated. In addition, Al amorphous mineral phases and/or poorly crystalline play an important role in the formation of strongly cemented horizons (duripans) of the Spodosols, as also reported by other authors. Finally, the ODOE showed to be an efficient indicator of soils under podzolization process, being possible its use as a taxonomic criterion for classification of Spodosols by the BSCS.

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