Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil

Detalhes bibliográficos
Autor(a) principal: Fernandes, Kathleen Lourenço
Data de Publicação: 2017
Outros Autores: Ribon, Adriana Aparecida, Marques Junior, José, Bahia, Angélica Santos Rabelo de Souza, Tavares Filho, João
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/24560
Resumo: The objective of this work was to estimate the iron oxide contents (hematite and goethite) and to characterize the color and the spectral and magnetic signatures of Cerrado soils in the state of Goiás, Brazil. Six Oxisols and one Inceptisol were studied. Spectral and magnetic signatures were determined by diffuse reflectance spectroscopy (DRS) and magnetic susceptibility, respectively. Then, the spectral curves and the second derivative calculations were used to determine hematite and goethite contents, as well as soil color after conversion into tristimulus values. Hematite and goethite contents were also obtained by x-ray diffractometry, and soil color was also defined in the field (Munsell color chart). The values for the isomorphic substitution of iron by aluminum and the degree of redness were also determined. DRS can be used to estimate hematite and goethite contents, as well as the color of Cerrado soils in the state of Goiás. The spectral signature can point out the main soil properties related to the contents of organic matter, iron oxides, kaolinite, and gibbsite. The magnetic signature, characteristic of soils rich in iron oxides (hematite and goethite), shows the predominance of pedogenic minerals.
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spelling Magnetic and spectral signatures of Cerrado soils in the state of Goiás, BrazilAssinaturas magnéticas e espectrais de solos do Cerrado de Goiásdiffuse reflectance spectroscopy; goethite; hematite; magnetic susceptibility; Oxisolsespectroscopia de reflectância difusa; goethita; hematita; suscetibilidade magnética; LatossolosThe objective of this work was to estimate the iron oxide contents (hematite and goethite) and to characterize the color and the spectral and magnetic signatures of Cerrado soils in the state of Goiás, Brazil. Six Oxisols and one Inceptisol were studied. Spectral and magnetic signatures were determined by diffuse reflectance spectroscopy (DRS) and magnetic susceptibility, respectively. Then, the spectral curves and the second derivative calculations were used to determine hematite and goethite contents, as well as soil color after conversion into tristimulus values. Hematite and goethite contents were also obtained by x-ray diffractometry, and soil color was also defined in the field (Munsell color chart). The values for the isomorphic substitution of iron by aluminum and the degree of redness were also determined. DRS can be used to estimate hematite and goethite contents, as well as the color of Cerrado soils in the state of Goiás. The spectral signature can point out the main soil properties related to the contents of organic matter, iron oxides, kaolinite, and gibbsite. The magnetic signature, characteristic of soils rich in iron oxides (hematite and goethite), shows the predominance of pedogenic minerals.O objetivo deste trabalho foi estimar os teores de óxidos de ferro (hematita e goethita) e caracterizar a cor e as assinaturas espectrais e magnéticas de solos do Cerrado de Goiás. Foram estudados seis Latossolos e um Cambissolo. As assinaturas espectrais e magnéticas foram determinadas por espectroscopia de reflectância difusa (ERD) e suscetibilidade magnética, respectivamente. Posteriormente, as curvas espectrais e os cálculos de derivativos secundários foram utilizados para determinar os conteúdos de hematita e goethita, além da cor dos solos após conversão em valores tristimulus. Os teores de hematita e goethita também foram obtidos por difratometria de raios-x, e a cor dos solos também foi avaliada em campo (carta de Munsell). Também foram determinados os valores de substituição isomórfica do ferro por alumínio e o índice de avermelhamento dos solos. A ERD pode ser utilizada para estimar os conteúdos de hematita e goethita, bem como a cor dos solos do Cerrado de Goiás. A assinatura espectral é capaz de apontar as principais características dos solos relacionadas aos conteúdos de matéria orgânica, óxidos de ferro, caulinita e gibbsita. A assinatura magnética, característica de solos ricos em óxidos de ferro (hematita e goethita), mostra o predomínio de minerais pedogenéticos.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFernandes, Kathleen LourençoRibon, Adriana AparecidaMarques Junior, JoséBahia, Angélica Santos Rabelo de SouzaTavares Filho, João2017-11-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/24560Pesquisa Agropecuaria Brasileira; v.52, n.10, out. 2017; 923-932Pesquisa Agropecuária Brasileira; v.52, n.10, out. 2017; 923-9321678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/24560/13982https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/24560/16412Direitos autorais 2017 Pesquisa Agropecuária Brasileirainfo:eu-repo/semantics/openAccess2017-11-17T11:59:47Zoai:ojs.seer.sct.embrapa.br:article/24560Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2017-11-17T11:59:47Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
Assinaturas magnéticas e espectrais de solos do Cerrado de Goiás
title Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
spellingShingle Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
Fernandes, Kathleen Lourenço
diffuse reflectance spectroscopy; goethite; hematite; magnetic susceptibility; Oxisols
espectroscopia de reflectância difusa; goethita; hematita; suscetibilidade magnética; Latossolos
title_short Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
title_full Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
title_fullStr Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
title_full_unstemmed Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
title_sort Magnetic and spectral signatures of Cerrado soils in the state of Goiás, Brazil
author Fernandes, Kathleen Lourenço
author_facet Fernandes, Kathleen Lourenço
Ribon, Adriana Aparecida
Marques Junior, José
Bahia, Angélica Santos Rabelo de Souza
Tavares Filho, João
author_role author
author2 Ribon, Adriana Aparecida
Marques Junior, José
Bahia, Angélica Santos Rabelo de Souza
Tavares Filho, João
author2_role author
author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Fernandes, Kathleen Lourenço
Ribon, Adriana Aparecida
Marques Junior, José
Bahia, Angélica Santos Rabelo de Souza
Tavares Filho, João
dc.subject.por.fl_str_mv diffuse reflectance spectroscopy; goethite; hematite; magnetic susceptibility; Oxisols
espectroscopia de reflectância difusa; goethita; hematita; suscetibilidade magnética; Latossolos
topic diffuse reflectance spectroscopy; goethite; hematite; magnetic susceptibility; Oxisols
espectroscopia de reflectância difusa; goethita; hematita; suscetibilidade magnética; Latossolos
description The objective of this work was to estimate the iron oxide contents (hematite and goethite) and to characterize the color and the spectral and magnetic signatures of Cerrado soils in the state of Goiás, Brazil. Six Oxisols and one Inceptisol were studied. Spectral and magnetic signatures were determined by diffuse reflectance spectroscopy (DRS) and magnetic susceptibility, respectively. Then, the spectral curves and the second derivative calculations were used to determine hematite and goethite contents, as well as soil color after conversion into tristimulus values. Hematite and goethite contents were also obtained by x-ray diffractometry, and soil color was also defined in the field (Munsell color chart). The values for the isomorphic substitution of iron by aluminum and the degree of redness were also determined. DRS can be used to estimate hematite and goethite contents, as well as the color of Cerrado soils in the state of Goiás. The spectral signature can point out the main soil properties related to the contents of organic matter, iron oxides, kaolinite, and gibbsite. The magnetic signature, characteristic of soils rich in iron oxides (hematite and goethite), shows the predominance of pedogenic minerals.
publishDate 2017
dc.date.none.fl_str_mv 2017-11-17
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/24560
url https://seer.sct.embrapa.br/index.php/pab/article/view/24560
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/24560/13982
https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/24560/16412
dc.rights.driver.fl_str_mv Direitos autorais 2017 Pesquisa Agropecuária Brasileira
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Direitos autorais 2017 Pesquisa Agropecuária Brasileira
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.52, n.10, out. 2017; 923-932
Pesquisa Agropecuária Brasileira; v.52, n.10, out. 2017; 923-932
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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