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| Almeida,Jaime Antonio de; Cararo,Denis Cesar; Uberti,Antônio Ayrton Auzani. |
| Dark subsurface horizons, with properties similar to the sombric horizon characterized by the USA Soil Taxonomy, are frequent in Southern Brazil. The genesis of this horizon is controversial and poorly understood. This study aimed to describe the occurrence of sombric-like horizons in Ultisols in the South of Santa Catarina State, at low altitudes, and suggest possible processes of humus transference, accumulation and persistence in these horizons. Physical, chemical and mineralogical properties of four Ultisols were evaluated; three were sampled in a toposequence, and another representative one in an isolated profile (RSP). The dark subsurface horizons coincide with the AB and BA transitional genetic horizons; they are acid, low in base saturation, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dark subsurface horizon; Podzolization; Buried A horizon; Clay-humic substances; Climatic changes. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200018 |
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| Chiapini,Mariane; Oliveira Junior,Jairo Calderari de; Schellekens,Judith; Almeida,Jaime Antonio de; Buurman,Peter; Vidal-Torrado,Pablo. |
| ABSTRACT The occurrence of dark subsurface horizons rich in organic matter (OM) associated with polychrome in the B horizon (yellowish over reddish hue) is common in soils from Southern Brazil. The formation of these horizons and the combination with such morphological attributes has not been properly documented, and neither has the cause effect relationship. Four soil profiles with such sombric-like horizons with a yellowish color at the upper part of the B horizon over red subsoil were studied in Southern Brazil. Results from micromorphology, extractable sesquioxide minerals, clay mineralogy and isomorphic substitution of Fe by Al in iron minerals showed that melanization, xanthization, bioturbation, moderate shrinking/swelling and moderate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argissolos; Goethite; Dark subsurface horizon; Shiny peds; Matte aggregate faces. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401 |
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