Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions
Identifieur interne : 00B892 ( Main/Merge ); précédent : 00B891; suivant : 00B893Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions
Auteurs : L. M. Bresson [France] ; C. J. Moran [Australie]Source :
- Geoderma : (Amsterdam) [ 0016-7061 ] ; 2004.
Descripteurs français
- Pascal (Inist)
- Nouvelle Galles du Sud, Etude expérimentale, Propriété physicochimique, Porosité, Sol, Propriété physique, Terrain couverture, Etude laboratoire, Pluie, Cinétique, Lame mince, Irrigation, Limon, Simulation numérique, Erosion sol, Granulat, Abrasion, Compaction, Carotte, Dispersion, Goutte pluie, Micromorphologie, Slumping, Microfissure.
- Wicri :
- topic : Irrigation.
English descriptors
- KwdEn :
- New South Wales, abrasion, aggregate, compaction, digital simulation, dispersion, drill cores, experimental studies, irrigation, kinetics, laboratory studies, loam, microfissures, micromorphology, overburden, physical properties, physicochemical properties, porosity, raindrops, rainfall, slumping, soil erosion, soils, thin sections.
Abstract
Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.
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M." last="Bresson">L. M. Bresson</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>UMR INRA/INAPG Environnement et Grandes Cultures</s1><s2>78850 Thiverval-Grignon</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiverval-Grignon</settlement></placeName></affiliation></author><author><name sortKey="Moran, C J" sort="Moran, C J" uniqKey="Moran C" first="C. J." last="Moran">C. J. Moran</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>CSIRO Land and Water GPO Box 1660</s1><s2>Canberra, ACT 2601</s2><s3>AUS</s3><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>CSIRO Land and Water GPO Box 1660</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Geoderma : (Amsterdam)</title><title level="j" type="abbreviated">Geoderma : (Amst.)</title><idno type="ISSN">0016-7061</idno><imprint><date when="2004">2004</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Geoderma : (Amsterdam)</title><title level="j" type="abbreviated">Geoderma : (Amst.)</title><idno type="ISSN">0016-7061</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>New South Wales</term><term>abrasion</term><term>aggregate</term><term>compaction</term><term>digital simulation</term><term>dispersion</term><term>drill cores</term><term>experimental studies</term><term>irrigation</term><term>kinetics</term><term>laboratory studies</term><term>loam</term><term>microfissures</term><term>micromorphology</term><term>overburden</term><term>physical properties</term><term>physicochemical properties</term><term>porosity</term><term>raindrops</term><term>rainfall</term><term>slumping</term><term>soil erosion</term><term>soils</term><term>thin sections</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Nouvelle Galles du Sud</term><term>Etude expérimentale</term><term>Propriété physicochimique</term><term>Porosité</term><term>Sol</term><term>Propriété physique</term><term>Terrain couverture</term><term>Etude laboratoire</term><term>Pluie</term><term>Cinétique</term><term>Lame mince</term><term>Irrigation</term><term>Limon</term><term>Simulation numérique</term><term>Erosion sol</term><term>Granulat</term><term>Abrasion</term><term>Compaction</term><term>Carotte</term><term>Dispersion</term><term>Goutte pluie</term><term>Micromorphologie</term><term>Slumping</term><term>Microfissure</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Irrigation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Thiverval-Grignon</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Bresson, L M" sort="Bresson, L M" uniqKey="Bresson L" first="L. M." last="Bresson">L. M. Bresson</name></region></country><country name="Australie"><noRegion><name sortKey="Moran, C J" sort="Moran, C J" uniqKey="Moran C" first="C. J." last="Moran">C. J. Moran</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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