Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/5585
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dc.contributor.authorHallett, P Den
dc.contributor.authorNunan, Nen
dc.contributor.authorDouglas, J Ten
dc.contributor.authorYoung, Iainen
dc.date.accessioned2010-04-16T09:53:00Z-
dc.date.issued2004-
dc.identifier.citationSoil Science Society of America Journal, 68(2), p. 352-358en
dc.identifier.issn1435-0661en
dc.identifier.issn0361-5995en
dc.identifier.urihttps://hdl.handle.net/1959.11/5585-
dc.description.abstractRecent evidence suggests that reduced water infiltration may be linked to small scale microbial and/or chemical processes that cause subcritical water repellency. We measured water sorptivity on the surface of a large intact block of soil (0.9 m wide, 1.3 m long, 0.25 m deep) taken from a grassland site and examined the effects of surface elevation and water repellency on water sorptivity at the millimeter scale. The soil block was partially dried to 0.22 mm3 mm-3, appeared to wet readily, and is not severely water repellent at any water content. Water sorptivity varied from 0.1 to 0.8 mm s⁻¹/² across the sampling grid with a coefficient of variation (CV) of 0.57. Water repellency, determined by comparing water and ethanol sorptivities, also varied considerably (CV = 0.47). Geostatistical analyses of water sorptivity and repellency measurements found little evidence of spatial autocorrelation, suggesting a high degree of local variability. These data were compared to larger scale measurements obtained with conventional infiltrometers under tension conditions (40 mm contact radius), and ponded conditions (37 and 55 mm radius rings) where macropores influence infiltration heterogeneity. Larger scale tension infiltrometer measurements were less variable with a CV of 0.22, whereas ponded infiltrometer measurements were more variable, CV > 0.50, presumably because of the influence of macropore flow. Data collected on surface elevation showed that ponded infiltration but not tension infiltration was influenced by surface topography. The results suggested that repellency can induce levels of spatial variability in water transport at small scales comparable to what macropores induce at larger scales.en
dc.languageenen
dc.publisherSoil Science Society of Americaen
dc.relation.ispartofSoil Science Society of America Journalen
dc.titleMillimeter-Scale Spatial Variability in Soil Water Sorptivity: Scale, Surface Elevation, and Subcritical Repellency Effectsen
dc.typeJournal Articleen
dc.subject.keywordsSoil Physicsen
dc.subject.keywordsSoil Biologyen
dc.subject.keywordsSoil Sciencesen
dc.subject.keywordsTerrestrial Ecologyen
local.contributor.firstnameP Den
local.contributor.firstnameNen
local.contributor.firstnameJ Ten
local.contributor.firstnameIainen
local.subject.for2008050305 Soil Physicsen
local.subject.for2008050303 Soil Biologyen
local.subject.for2008060208 Terrestrial Ecologyen
local.subject.for2008050399 Soil Sciences not elsewhere classifieden
local.subject.seo2008961402 Farmland, Arable Cropland and Permanent Cropland Soilsen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailiyoung4@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20100225-124056en
local.publisher.placeUnited States of Americaen
local.format.startpage352en
local.format.endpage358en
local.peerreviewedYesen
local.identifier.volume68en
local.identifier.issue2en
local.title.subtitleScale, Surface Elevation, and Subcritical Repellency Effectsen
local.contributor.lastnameHalletten
local.contributor.lastnameNunanen
local.contributor.lastnameDouglasen
local.contributor.lastnameYoungen
dc.identifier.staffune-id:iyoung4en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:5717en
dc.identifier.academiclevelAcademicen
local.title.maintitleMillimeter-Scale Spatial Variability in Soil Water Sorptivityen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.relation.urlhttp://soil.scijournals.org/cgi/content/abstract/68/2/352en
local.search.authorHallett, P Den
local.search.authorNunan, Nen
local.search.authorDouglas, J Ten
local.search.authorYoung, Iainen
local.uneassociationUnknownen
local.year.published2004en
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