Rheological evaluation of soil aggregate microstructure and stability across a forested catena

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dc.contributor.authorJavaheri, Fatemehen
dc.contributor.authorEsfandiarpour-Boroujeni, Isaen
dc.contributor.authorKourki, Hajiren
dc.contributor.authorFarpoor, Mohammad Hadyen
dc.contributor.authorStewart, Ryan D.en
dc.date.accessioned2021-12-05T22:57:35Zen
dc.date.available2021-12-05T22:57:35Zen
dc.date.issued2021-12-01en
dc.date.updated2021-12-05T22:57:32Zen
dc.description.abstractRheological characteristics of soils, including their deformation and flow behaviors when subjected to external stress, can provide important information on microstructural stability. In this study we used rheological measurements to examine the soil aggregate microstructure and stability of four different soil orders – Alfisol, Mollisol, Inceptisol, and Entisol – along a forested catena in Mazandaran Province, northern Iran. Amplitude sweep tests were used to quantify the initial values of the storage and loss moduli, deformation limit (when the material begins to transition from reversible to irreversible deformation), deformation at flow point (when the material becomes viscous), and integral z (which summarizes the overall visco-elasticity of the material). The deformation limit was significantly higher in subsoil layers than topsoil layers, and was also higher in the Mollisol than the other pedons. The flow point and integral z values, which relate to the structural stiffness of soil matrices, were largest in the Btg horizons of the Alfisol and Mollisol, implying that these soils had more rigid microstructures. In contrast, the Entisol Ckg horizon, which had high sand content and little soil development, had the lowest values for all properties, thus indicating a lack of micro-aggregate stability. Regression analyses revealed that integral z was influenced by soil physicochemical properties, and was higher in soils whose clay fraction was dominated by expansive clay minerals and pedogenic iron and aluminum sesquioxides. Altogether, the rheological parameters indicated that older, more developed soils had greater microstructural stability than their less developed counterparts. As a result, rheological measurements may be useful for identifying the major factors that affect soil aggregation, and can indicate the relative amount of soil development along gradients such as the studied forest catena.en
dc.description.versionAccepted versionen
dc.format.extent13 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN 115196 (Article number)en
dc.identifier.doihttps://doi.org/10.1016/j.geoderma.2021.115196en
dc.identifier.eissn1872-6259en
dc.identifier.issn0016-7061en
dc.identifier.orcidStewart, Ryan [0000-0002-9700-0351]en
dc.identifier.urihttp://hdl.handle.net/10919/106841en
dc.identifier.volume403en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000671591200008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSoil Scienceen
dc.subjectAgricultureen
dc.subjectRheologyen
dc.subjectDeformationen
dc.subjectAmplitude sweep testen
dc.subjectSoil developmenten
dc.subjectSoil organic carbon (SOC)en
dc.subjectORGANIC-MATTERen
dc.subjectMAGNETIC-SUSCEPTIBILITYen
dc.subjectWATERen
dc.subjectDEGRADATIONen
dc.subjectMECHANICSen
dc.subjectSTIFFNESSen
dc.subjectRHEOMETRYen
dc.subjectTURNOVERen
dc.subjectSTRENGTHen
dc.subjectBEHAVIORen
dc.subjectAgronomy & Agricultureen
dc.subject05 Environmental Sciencesen
dc.subject06 Biological Sciencesen
dc.subject07 Agricultural and Veterinary Sciencesen
dc.titleRheological evaluation of soil aggregate microstructure and stability across a forested catenaen
dc.title.serialGeodermaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/University Research Institutesen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen
pubs.organisational-group/Virginia Tech/University Research Institutes/Fralin Life Sciences/Durelle Scotten
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/School of Plant and Environmental Sciencesen

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