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A measure of soil structure derived from water retention properties
Descriptive
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Text
TitleInfo
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Title
A measure of soil structure derived from water retention properties
SubTitle
a Kullback-Leibler distance approach
PartName
PartNumber
NonSort
Identifier
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ETD_1512
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000052177
Language
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eng
Genre
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theses
Subject
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Topic
Environmental Sciences
Subject
(ID = SBJ-2);
(authority = ETD-LCSH)
Topic
Soil structure
Abstract
Water retention curves of structured soils reflect the combined effects of pore systems associated to a given distribution of particle sizes (texture) and those that are the result of rearrangement of soil particles into soil structural units. The main hypothesis of this work was that the entropic distance between structural and textural soil pore systems can be a measure of soil structure. It was also hypothesized that such distance can be derived from water retention curves by assuming that both pore systems follow lognormal distributions and that textural pore systems are the result of random arrangements of particles sizes. The entropic difference between the distributions of the two pore systems considered was derived as a Kullback-Leibler Distance or KLD using an explicit equation that uses the geometric means and standard deviations of pores and particle size distributions derived from water retention data and from information on clay, silt and sand content. Data on water retention and texture obtained for this study was supplemented with data from the literature and with data on 1468 soils from the US National Pedon Characterization database. The KLD concept was tested by comparing physically disturbed samples with undisturbed samples over a range of soil structure conditions. Values of KLD from younger soils along two chronosequences, and from compacted and/or degraded soils were smaller than those from older soils and non compacted or degraded soils. Also, KLD values of disturbed samples were lower than those of undisturbed samples. The use of KLD in a large dataset showed that KLD was linearly related to saturated hydraulic conductivity, which is an important hydraulic property. Also, KLD was an important grouping factor in a regression tree analysis for estimation of water content at -33 kPa and in clusters defined from a combination of field and morphological variables. The KLD measure is a promising tool to characterize soil structure. Future studies should consider incorporating KLD into pedotransfer functions or other predictive schemes aimed at improving the estimation of hydraulic properties, which are sensitive to soil structure.
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electronic resource
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xv, 130 p. : ill.
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Note
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Ph.D.
Note
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Includes bibliographical references
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by Sung Won Yoon
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Yoon
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Sung Won
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Sung Won Yoon
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Gimenez
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Daniel
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chair
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Advisory Committee
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Daniel Gimenez
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Strom
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Peter
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internal member
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Advisory Committee
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Peter Strom
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Arend-Jan
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Advisory Committee
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Arend-Jan Both
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Nemes
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Attila
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Advisory Committee
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Attila Nemes
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
OriginInfo
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2009
DateOther
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2009-01
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xx
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Rutgers University Electronic Theses and Dissertations
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ETD
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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Identifier
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doi:10.7282/T3TD9XH0
Genre
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ETD doctoral
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Rights
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The author owns the copyright to this work.
Copyright
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Copyright protected
Notice
Note
Availability
Status
Open
Reason
Permission or license
Note
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Name
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Yoon
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Sung Won
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2009-01-08 02:30:33
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Sung Won Yoon
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Rutgers University. Graduate School - New Brunswick
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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DRM implementation
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365 days
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365 days
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ETD
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application/pdf
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