Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401 |
Resumo: | 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 ferralitization were the most evident pedogenetic processes in role. Xanthization is closely related to the sombric-like horizon formation. In the studied area the findings demonstrated that no clay and OM illuviation had taken place. Therefore, the classification of these soils was revisited, so as to take into account the processes that underlie their genesis with emphasis on xanthization, clay illuviation and soil aggregation. The results suggest that the sombric horizon may need redefinition, unless profiles can be found in which illuviation of clay and/or OM can be proven. |
id |
USP-18_a1250578a9141ed9bba7fd7bcb7ec8d5 |
---|---|
oai_identifier_str |
oai:scielo:S0103-90162021000401401 |
network_acronym_str |
USP-18 |
network_name_str |
Scientia Agrícola (Online) |
repository_id_str |
|
spelling |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classificationArgissolosgoethitedark subsurface horizonshiny pedsmatte aggregate facesABSTRACT 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 ferralitization were the most evident pedogenetic processes in role. Xanthization is closely related to the sombric-like horizon formation. In the studied area the findings demonstrated that no clay and OM illuviation had taken place. Therefore, the classification of these soils was revisited, so as to take into account the processes that underlie their genesis with emphasis on xanthization, clay illuviation and soil aggregation. The results suggest that the sombric horizon may need redefinition, unless profiles can be found in which illuviation of clay and/or OM can be proven.Escola Superior de Agricultura "Luiz de Queiroz"2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401Scientia Agricola v.78 n.4 2021reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/1678-992x-2019-0115info:eu-repo/semantics/openAccessChiapini,MarianeOliveira Junior,Jairo Calderari deSchellekens,JudithAlmeida,Jaime Antonio deBuurman,PeterVidal-Torrado,Pabloeng2020-07-06T00:00:00Zoai:scielo:S0103-90162021000401401Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2020-07-06T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
title |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
spellingShingle |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification Chiapini,Mariane Argissolos goethite dark subsurface horizon shiny peds matte aggregate faces |
title_short |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
title_full |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
title_fullStr |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
title_full_unstemmed |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
title_sort |
Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification |
author |
Chiapini,Mariane |
author_facet |
Chiapini,Mariane Oliveira Junior,Jairo Calderari de Schellekens,Judith Almeida,Jaime Antonio de Buurman,Peter Vidal-Torrado,Pablo |
author_role |
author |
author2 |
Oliveira Junior,Jairo Calderari de Schellekens,Judith Almeida,Jaime Antonio de Buurman,Peter Vidal-Torrado,Pablo |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Chiapini,Mariane Oliveira Junior,Jairo Calderari de Schellekens,Judith Almeida,Jaime Antonio de Buurman,Peter Vidal-Torrado,Pablo |
dc.subject.por.fl_str_mv |
Argissolos goethite dark subsurface horizon shiny peds matte aggregate faces |
topic |
Argissolos goethite dark subsurface horizon shiny peds matte aggregate faces |
description |
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 ferralitization were the most evident pedogenetic processes in role. Xanthization is closely related to the sombric-like horizon formation. In the studied area the findings demonstrated that no clay and OM illuviation had taken place. Therefore, the classification of these soils was revisited, so as to take into account the processes that underlie their genesis with emphasis on xanthization, clay illuviation and soil aggregation. The results suggest that the sombric horizon may need redefinition, unless profiles can be found in which illuviation of clay and/or OM can be proven. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1678-992x-2019-0115 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
dc.source.none.fl_str_mv |
Scientia Agricola v.78 n.4 2021 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1748936465663918080 |