Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.22/7268 |
Resumo: | Abstract: Preferential flow and transport through macropores affect plant water use efficiency and enhance leaching of agrochemicals and the transport of colloids, thereby increasing the risk for contamination of groundwater resources. The effects of soil compaction, expressed in terms of bulk density (BD), and organic carbon (OC) content on preferential flow and transport were investigated using 150 undisturbed soil cores sampled from 15 × 15–m grids on two field sites. Both fields had loamy textures, but one site had significantly higher OC content. Leaching experiments were conducted in each core by applying a constant irrigation rate of 10 mm h−1 with a pulse application of tritium tracer. Five percent tritium mass arrival times and apparent dispersivities were derived from each of the tracer breakthrough curves and correlated with texture, OC content, and BD to assess the spatial distribution of preferential flow and transport across the investigated fields. Soils from both fields showed strong positive correlations between BD and preferential flow. Interestingly, the relationships between BD and tracer transport characteristics were markedly different for the two fields, although the relationship between BD and macroporosity was nearly identical. The difference was likely caused by the higher contents of fines and OC at one of the fields leading to stronger aggregation, smaller matrix permeability, and a more pronounced pipe-like pore system with well-aligned macropores. |
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Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field SoilsPreferential flowChemical transportHydraulic conductivityBulk densityOrganic carbonMacroporesAbstract: Preferential flow and transport through macropores affect plant water use efficiency and enhance leaching of agrochemicals and the transport of colloids, thereby increasing the risk for contamination of groundwater resources. The effects of soil compaction, expressed in terms of bulk density (BD), and organic carbon (OC) content on preferential flow and transport were investigated using 150 undisturbed soil cores sampled from 15 × 15–m grids on two field sites. Both fields had loamy textures, but one site had significantly higher OC content. Leaching experiments were conducted in each core by applying a constant irrigation rate of 10 mm h−1 with a pulse application of tritium tracer. Five percent tritium mass arrival times and apparent dispersivities were derived from each of the tracer breakthrough curves and correlated with texture, OC content, and BD to assess the spatial distribution of preferential flow and transport across the investigated fields. Soils from both fields showed strong positive correlations between BD and preferential flow. Interestingly, the relationships between BD and tracer transport characteristics were markedly different for the two fields, although the relationship between BD and macroporosity was nearly identical. The difference was likely caused by the higher contents of fines and OC at one of the fields leading to stronger aggregation, smaller matrix permeability, and a more pronounced pipe-like pore system with well-aligned macropores.Wolters Kluwer Health, IncRepositório Científico do Instituto Politécnico do PortoSoares, AntónioMoldrup, PerVendelboe, Anders LindbladKatuwal, SheelaNorgaard, TrineDelerue-Matos, CristinaTuller, MarkusJonge, Lis W. de2015-12-28T15:43:56Z2015-012015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.22/7268eng10.1097/SS.0000000000000105info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-13T12:47:37Zoai:recipp.ipp.pt:10400.22/7268Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:27:44.486619Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
title |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
spellingShingle |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils Soares, António Preferential flow Chemical transport Hydraulic conductivity Bulk density Organic carbon Macropores |
title_short |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
title_full |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
title_fullStr |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
title_full_unstemmed |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
title_sort |
Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils |
author |
Soares, António |
author_facet |
Soares, António Moldrup, Per Vendelboe, Anders Lindblad Katuwal, Sheela Norgaard, Trine Delerue-Matos, Cristina Tuller, Markus Jonge, Lis W. de |
author_role |
author |
author2 |
Moldrup, Per Vendelboe, Anders Lindblad Katuwal, Sheela Norgaard, Trine Delerue-Matos, Cristina Tuller, Markus Jonge, Lis W. de |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Repositório Científico do Instituto Politécnico do Porto |
dc.contributor.author.fl_str_mv |
Soares, António Moldrup, Per Vendelboe, Anders Lindblad Katuwal, Sheela Norgaard, Trine Delerue-Matos, Cristina Tuller, Markus Jonge, Lis W. de |
dc.subject.por.fl_str_mv |
Preferential flow Chemical transport Hydraulic conductivity Bulk density Organic carbon Macropores |
topic |
Preferential flow Chemical transport Hydraulic conductivity Bulk density Organic carbon Macropores |
description |
Abstract: Preferential flow and transport through macropores affect plant water use efficiency and enhance leaching of agrochemicals and the transport of colloids, thereby increasing the risk for contamination of groundwater resources. The effects of soil compaction, expressed in terms of bulk density (BD), and organic carbon (OC) content on preferential flow and transport were investigated using 150 undisturbed soil cores sampled from 15 × 15–m grids on two field sites. Both fields had loamy textures, but one site had significantly higher OC content. Leaching experiments were conducted in each core by applying a constant irrigation rate of 10 mm h−1 with a pulse application of tritium tracer. Five percent tritium mass arrival times and apparent dispersivities were derived from each of the tracer breakthrough curves and correlated with texture, OC content, and BD to assess the spatial distribution of preferential flow and transport across the investigated fields. Soils from both fields showed strong positive correlations between BD and preferential flow. Interestingly, the relationships between BD and tracer transport characteristics were markedly different for the two fields, although the relationship between BD and macroporosity was nearly identical. The difference was likely caused by the higher contents of fines and OC at one of the fields leading to stronger aggregation, smaller matrix permeability, and a more pronounced pipe-like pore system with well-aligned macropores. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-28T15:43:56Z 2015-01 2015-01-01T00:00:00Z |
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 |
http://hdl.handle.net/10400.22/7268 |
url |
http://hdl.handle.net/10400.22/7268 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1097/SS.0000000000000105 |
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 |
Wolters Kluwer Health, Inc |
publisher.none.fl_str_mv |
Wolters Kluwer Health, Inc |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799131373429063680 |