Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/13408 |
Resumo: | In soil surveys, it is usual to find profiles with an uncommon disposition of horizons. Dark horizons in depth might be either the consequence of erosion and redeposition of soil materials from upslope or an indication of the podzolization process, which forms a spodic horizon. Few laboratory analyses are known to characterize dark subsurface horizons which could allow for the differentiation of spodic from buried A horizons. Some researchers propose C-humic and C-fulvic acid fraction ratios and forms of carbon to analyze characteristics of these horizons. Therefore, this research aimed to characterize dark subsurface horizons found in soils under a Eucalyptus minimum tillage system in the state of Rio Grande do Sul, Brazil, and to relate soil organic carbon to landscape features in toposequences. The characterization was performed by using the following ratios: humic acid and fulvic acid fractions (Cha/Cfa); pyrophosphate extractable-C and organic carbon (Cp/OC); fulvic acid fraction and pyrophosphate extractable-C (Cfa/Cp), and fulvic acid fraction and organic carbon (Cfa/OC). Soil organic carbon was related to slope gradient and Geomorphons in a Geographic Information System (GIS). None of the horizons analyzed met the criteria required for spodic horizon classification, where Cha/Cfa < 0.50, Cfa/OC < 0.30, and the ratio Cp/OC ≥ 0.50 simultaneously with Cfa/Cp ≥ 0.50. A relationship was found between landscape features and soil organic carbon content. The methodology proved to be satisfactory for providing scientific support to field morphology classification of dark subsurface horizons, specifically in the case where they could be misinterpreted as spodic horizons. |
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Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizonsSoils – Organic compound contentSoils – Dark horizonErosionPodzolizationHumic substancesSolos – Teor de compostos orgânicosSolos – Camada escuraErosãoPodzolizaçãoSubstâncias húmicasIn soil surveys, it is usual to find profiles with an uncommon disposition of horizons. Dark horizons in depth might be either the consequence of erosion and redeposition of soil materials from upslope or an indication of the podzolization process, which forms a spodic horizon. Few laboratory analyses are known to characterize dark subsurface horizons which could allow for the differentiation of spodic from buried A horizons. Some researchers propose C-humic and C-fulvic acid fraction ratios and forms of carbon to analyze characteristics of these horizons. Therefore, this research aimed to characterize dark subsurface horizons found in soils under a Eucalyptus minimum tillage system in the state of Rio Grande do Sul, Brazil, and to relate soil organic carbon to landscape features in toposequences. The characterization was performed by using the following ratios: humic acid and fulvic acid fractions (Cha/Cfa); pyrophosphate extractable-C and organic carbon (Cp/OC); fulvic acid fraction and pyrophosphate extractable-C (Cfa/Cp), and fulvic acid fraction and organic carbon (Cfa/OC). Soil organic carbon was related to slope gradient and Geomorphons in a Geographic Information System (GIS). None of the horizons analyzed met the criteria required for spodic horizon classification, where Cha/Cfa < 0.50, Cfa/OC < 0.30, and the ratio Cp/OC ≥ 0.50 simultaneously with Cfa/Cp ≥ 0.50. A relationship was found between landscape features and soil organic carbon content. The methodology proved to be satisfactory for providing scientific support to field morphology classification of dark subsurface horizons, specifically in the case where they could be misinterpreted as spodic horizons.Universidade de São Paulo2017-07-20T18:21:38Z2017-07-20T18:21:38Z2015-07info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfTOMA, M. A. et al. Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons. Scientia Agricola, v. 72, n. 4, p. 334-342, July/Aug. 2015.http://repositorio.ufla.br/jspui/handle/1/13408Scientia Agricolareponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAToma, Maíra AkemiOwens, Phillip RaySilva, Carlos AlbertoSilva, Sérgio Henrique GodinhoSilva, Elen AlvarengaCuri, Niltoninfo:eu-repo/semantics/openAccesseng2017-07-20T18:21:38Zoai:localhost:1/13408Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2017-07-20T18:21:38Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
title |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
spellingShingle |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons Toma, Maíra Akemi Soils – Organic compound content Soils – Dark horizon Erosion Podzolization Humic substances Solos – Teor de compostos orgânicos Solos – Camada escura Erosão Podzolização Substâncias húmicas |
title_short |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
title_full |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
title_fullStr |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
title_full_unstemmed |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
title_sort |
Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons |
author |
Toma, Maíra Akemi |
author_facet |
Toma, Maíra Akemi Owens, Phillip Ray Silva, Carlos Alberto Silva, Sérgio Henrique Godinho Silva, Elen Alvarenga Curi, Nilton |
author_role |
author |
author2 |
Owens, Phillip Ray Silva, Carlos Alberto Silva, Sérgio Henrique Godinho Silva, Elen Alvarenga Curi, Nilton |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Toma, Maíra Akemi Owens, Phillip Ray Silva, Carlos Alberto Silva, Sérgio Henrique Godinho Silva, Elen Alvarenga Curi, Nilton |
dc.subject.por.fl_str_mv |
Soils – Organic compound content Soils – Dark horizon Erosion Podzolization Humic substances Solos – Teor de compostos orgânicos Solos – Camada escura Erosão Podzolização Substâncias húmicas |
topic |
Soils – Organic compound content Soils – Dark horizon Erosion Podzolization Humic substances Solos – Teor de compostos orgânicos Solos – Camada escura Erosão Podzolização Substâncias húmicas |
description |
In soil surveys, it is usual to find profiles with an uncommon disposition of horizons. Dark horizons in depth might be either the consequence of erosion and redeposition of soil materials from upslope or an indication of the podzolization process, which forms a spodic horizon. Few laboratory analyses are known to characterize dark subsurface horizons which could allow for the differentiation of spodic from buried A horizons. Some researchers propose C-humic and C-fulvic acid fraction ratios and forms of carbon to analyze characteristics of these horizons. Therefore, this research aimed to characterize dark subsurface horizons found in soils under a Eucalyptus minimum tillage system in the state of Rio Grande do Sul, Brazil, and to relate soil organic carbon to landscape features in toposequences. The characterization was performed by using the following ratios: humic acid and fulvic acid fractions (Cha/Cfa); pyrophosphate extractable-C and organic carbon (Cp/OC); fulvic acid fraction and pyrophosphate extractable-C (Cfa/Cp), and fulvic acid fraction and organic carbon (Cfa/OC). Soil organic carbon was related to slope gradient and Geomorphons in a Geographic Information System (GIS). None of the horizons analyzed met the criteria required for spodic horizon classification, where Cha/Cfa < 0.50, Cfa/OC < 0.30, and the ratio Cp/OC ≥ 0.50 simultaneously with Cfa/Cp ≥ 0.50. A relationship was found between landscape features and soil organic carbon content. The methodology proved to be satisfactory for providing scientific support to field morphology classification of dark subsurface horizons, specifically in the case where they could be misinterpreted as spodic horizons. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-07 2017-07-20T18:21:38Z 2017-07-20T18:21:38Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
TOMA, M. A. et al. Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons. Scientia Agricola, v. 72, n. 4, p. 334-342, July/Aug. 2015. http://repositorio.ufla.br/jspui/handle/1/13408 |
identifier_str_mv |
TOMA, M. A. et al. Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons. Scientia Agricola, v. 72, n. 4, p. 334-342, July/Aug. 2015. |
url |
http://repositorio.ufla.br/jspui/handle/1/13408 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo |
publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.source.none.fl_str_mv |
Scientia Agricola reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
_version_ |
1784550179690512384 |