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Effects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soils

2015-01Journal article Open access
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dc.contributor.authorSoares, António
dc.contributor.authorMoldrup, Per
dc.contributor.authorVendelboe, Anders Lindblad
dc.contributor.authorKatuwal, Sheela
dc.contributor.authorNorgaard, Trine
dc.contributor.authorDelerue-Matos, Cristina
dc.contributor.authorTuller, Markus
dc.contributor.authorJonge, Lis W. de
dc.date.accessioned2015-12-28T15:43:56Z
dc.date.available2015-12-28T15:43:56Z
dc.date.issued2015-01
dc.description.abstractAbstract: 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.pt_PT
dc.identifier.doi10.1097/SS.0000000000000105pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.22/7268
dc.language.isoengpt_PT
dc.publisherWolters Kluwer Health, Incpt_PT
dc.relation.ispartofseriesSoil Science;Vol. 180, Issue 1
dc.relation.publisherversionhttp://journals.lww.com/soilsci/Abstract/2015/01000/Effects_of_Soil_Compaction_and_Organic_Carbon.3.aspxpt_PT
dc.subjectPreferential flowpt_PT
dc.subjectChemical transportpt_PT
dc.subjectHydraulic conductivitypt_PT
dc.subjectBulk densitypt_PT
dc.subjectOrganic carbonpt_PT
dc.subjectMacroporespt_PT
dc.titleEffects of Soil Compaction and Organic Carbon Content on Preferential Flow in Loamy Field Soilspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage20pt_PT
oaire.citation.startPage10pt_PT
oaire.citation.titleSoil Sciencept_PT
oaire.citation.volume180pt_PT
person.familyNameDelerue-Matos
person.givenNameCristina
person.identifier.ciencia-id9A1A-43FB-5C27
person.identifier.orcid0000-0002-3924-776X
person.identifier.ridD-4990-2013
person.identifier.scopus-author-id6603741848
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication09f6a7bd-2f15-42b0-adc5-04bd22210519
relation.isAuthorOfPublication.latestForDiscovery09f6a7bd-2f15-42b0-adc5-04bd22210519

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