Clay decomposition in seasonally wet, acid soils: Micromorphological, chemical and mineralogical evidence from individual argillans

Brinkman, R.; Jongmans, A.G.; Miedema, R.; Maaskant, P.

doi:10.1016/0016-7061(73)90001-3

Cited by 62 publications

(36 citation statements)

References 6 publications

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“…Os valores da fração areia (Tabela 1), maiores na APC em relação aos murundus, exceto na profundidade de 0,1-0,2 m, podem ser associados à atividade térmita (Antunes et al 2012) e à perda de argila, comum em áreas úmidas, pelo processo de ferrólise conforme descrito por Brikman (1973). Esse autor também afirma que no processo de ferrólise, além do aumento proporcional da fração areia, ocorre expressiva lixiviação de cátions, o que condiz com o menor valor de bases trocáveis na APC (Tabela 2).…”

Section: Discussionunclassified

“…Esse autor também afirma que no processo de ferrólise, além do aumento proporcional da fração areia, ocorre expressiva lixiviação de cátions, o que condiz com o menor valor de bases trocáveis na APC (Tabela 2). Brikman et al (1973) relatam que em muitas áreas úmidas sazonais, os solos ácidos normalmente apresentam menor quantidade de argila nos Tabela 4. Contribuição relativa das variáveis para explicação dos componentes principais (F1 e F2) nas profundidades de 0-0,10, 0,10-0,2 e 0,2-0,4 de solo de campos de murundus e área plana circunvizinha na bacia do rio Guaporé, sudoeste do Estado de Mato Grosso.…”

Section: Discussionunclassified

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Chemical and physical attributes and calcium, magnesium, potassium, and phosphorus in the soil of murundu fields in Brazil

et al. 2015

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RESUMO Campos de murundus (CM, Al 3+ and H+Al] and physical [texture and bulk density (Bd)] soil attributes and calculate the organic matter (OM) and nutrient stock (P, Ca, Mg, and K) in soils of FM located in the Guapore River basin in Mato Grosso. Thirty-six sampling points were selected, and soil samples were collected from two environments: the murundu and plain area surrounding (PAS). At each sampling point, mini trenches of 0.5 × 0.5 × 0.4 m were opened and disturbed and undisturbed soil samples were collected at depths of 0-0.1, 0.1-0.2, and 0.2-0.4 m. In the Principal Component Analysis the variables H+Al (49%) and OM (4%) were associated with the F1 component and sand content (47%) with the F2 component. The FM had lower pH values and higher concentrations of K + , P, and H+Al than PAS at all depths (p < 0.05). Additionally, FM stocked up to 433, 360, 205, and 11 kg ha -1 of Ca, Mg, K, and P, respectively, for up to a depth of 0.2 m. The murundu stored two times more K and three times more P than that in the PAS. Our results show that the FM has high sand content and Bd greater than 1.5 Mg m -3 , high acidity, low OC content, and low nutrient concentrations. Thus, special care must be taken to preserve FM such that human intervention does not trigger environmental imbalances.

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Section: Discussionunclassified

Chemical and physical attributes and calcium, magnesium, potassium, and phosphorus in the soil of murundu fields in Brazil

et al. 2015

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“…Dissolution by 'ferrolysis' (Brinkman, 1970;Brinkman et al, 1973) involves the reduction of Fe under waterlogged conditions (e.g. paddies).…”

Section: Discussionmentioning

confidence: 99%

Mobilization of aluminium in the wathering profiles of the African surface in Malawi

McFarlane

Bowden

1992

Earth Surf Processes Landf

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Leaching of aluminium from the weathering profile of the African surface in Malawi was deduced from the chemistry of a vadose profile. Its loss occurs where congruent kaolinite dissolution results in saprolite collapse, leaving a weakly lateritized, sandy residual mantle. This leaching is a contemporary process, as shown by the precipitation of aluminosilicate evaporites in the dambos (seasonally waterlogged bottomlands). This paper presents the results of determinations, by ICP-OES and AAS-graphite furnace, of aluminium levels in groundwaters, examining the effects of a variety of pretreatments. Filtration (0.45 pm) substantially reduces the levels of total aluminium, showing it to be in particulate form. Subsequent acidification causes precipitation of < 0.45 pm forms of aluminium, further reducing the apparent levels to below ICP-OES detection limit. This is consistent with mobilization in organically bound forms which are destabilized at low pH, and accords with earlier work which showed that indigenous micro-organisms can cause dissolution of kaolinite. Organically bound mobilization provides an explanation for aluminium leaching at near-neutral pH in conjunction with the presence of silica in solution.The identification of this mechanism of kaolinite dissolution and aluminium evacuation from vadose profiles provides a realistic process for the levelling of extensive planation surfaces; the contingent collapse of the kaolinized saprolite would lower the interfluves, progressively narrowing the vadose zone until the landsurface approaches the planar form of the stable, regional water-table.

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“…It implies an acidic environment in which Al is more soluble that Si and is leached from the sediment while Si is retained as opal. Two mechanisms can be proposed: (1) in low hydrated plasmic or microporous systems, the pH can decrease subsequently to an intense dissociation of H 2 0 into H+ and OH- (Fripiat et al 1960;Bourrie and Pedro 1979); and (2) in hydromorphic environments two reactions may occur, either a release of an electron during Fe oxidation to produce a H+, or retention of another H+ during formation of hydroxides (Brinckmann 1970;Fripiat 1971;Brinckmann et al 1973;Chaussidon and Pedro 1979;Espiau and Pedro 1983). Progressive «autolysis» of the clay minerals is induced (Pedro and Delmas 1979) with migration of Al and retention of Si in disordered Si phases.…”

Section: Mechanisms Of Pedogenic Silicificationsmentioning

confidence: 97%

Continental Silicifications: A Review

Thiry¹

1997

Soils and Sediments

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Clay decomposition in seasonally wet, acid soils: Micromorphological, chemical and mineralogical evidence from individual argillans

Cited by 62 publications

References 6 publications

Chemical and physical attributes and calcium, magnesium, potassium, and phosphorus in the soil of murundu fields in Brazil

Chemical and physical attributes and calcium, magnesium, potassium, and phosphorus in the soil of murundu fields in Brazil

Mobilization of aluminium in the wathering profiles of the African surface in Malawi

Continental Silicifications: A Review

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