EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS

In order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a Luvisol. The experimental field, located in Harste/Goettingen, Germany, was cultivated with sugar beet (Beta vulgaris). The...

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Autores principales:	Dec,Dorota, Dorner,José, Becker-Fazekas,Orsolya, Horn,Rainer
Lenguaje:	English
Publicado:	Sociedad Chilena de la Ciencia del Suelo 2008
Materias:	Water retention curve soil shrinkage soil structure
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100001
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spelling	oai:scielo:S0718-279120080001000012008-09-10EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILSDec,DorotaDorner,JoséBecker-Fazekas,OrsolyaHorn,Rainer Water retention curve soil shrinkage soil structure In order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a Luvisol. The experimental field, located in Harste/Goettingen, Germany, was cultivated with sugar beet (Beta vulgaris). The water retention curve (WRC) and saturated hydraulic conductivity (Ks) were measured on undisturbed samples and homogenized samples prepared at different bulk densities (1.2 -1.4 and 1.6 Mg m-3). To determine the effect of soil shrinkage on the unsaturated hydraulic conductivity (k/Ψ) ,the vertical deformation of the repacked samples was measured and relative water content differences (dθ)were determined. The hydraulic properties of soils with identical texture depend on bulk density (dB) and structure. The increasing bulk density not only induces changes in the pore-size distribution but also affects the ability of soil to shrink and to conduct water under unsaturated conditions. Greater shrinkage was observed for samples with lower dB as a consequence of reduction of coarse pores. The water content differences increase with decreasing bulk density, inducing an increasing error in the estimation of k/Ψinfo:eu-repo/semantics/openAccessSociedad Chilena de la Ciencia del SueloRevista de la ciencia del suelo y nutrición vegetal v.8 n.1 20082008-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100001en10.4067/S0718-27912008000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Water retention curve soil shrinkage soil structure
spellingShingle	Water retention curve soil shrinkage soil structure Dec,Dorota Dorner,José Becker-Fazekas,Orsolya Horn,Rainer EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
description	In order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a Luvisol. The experimental field, located in Harste/Goettingen, Germany, was cultivated with sugar beet (Beta vulgaris). The water retention curve (WRC) and saturated hydraulic conductivity (Ks) were measured on undisturbed samples and homogenized samples prepared at different bulk densities (1.2 -1.4 and 1.6 Mg m-3). To determine the effect of soil shrinkage on the unsaturated hydraulic conductivity (k/Ψ) ,the vertical deformation of the repacked samples was measured and relative water content differences (dθ)were determined. The hydraulic properties of soils with identical texture depend on bulk density (dB) and structure. The increasing bulk density not only induces changes in the pore-size distribution but also affects the ability of soil to shrink and to conduct water under unsaturated conditions. Greater shrinkage was observed for samples with lower dB as a consequence of reduction of coarse pores. The water content differences increase with decreasing bulk density, inducing an increasing error in the estimation of k/Ψ
author	Dec,Dorota Dorner,José Becker-Fazekas,Orsolya Horn,Rainer
author_facet	Dec,Dorota Dorner,José Becker-Fazekas,Orsolya Horn,Rainer
author_sort	Dec,Dorota
title	EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
title_short	EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
title_full	EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
title_fullStr	EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
title_full_unstemmed	EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
title_sort	effect of bulk density on hydraulic properties of homogenized and structured soils
publisher	Sociedad Chilena de la Ciencia del Suelo
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100001
work_keys_str_mv	AT decdorota effectofbulkdensityonhydraulicpropertiesofhomogenizedandstructuredsoils AT dornerjose effectofbulkdensityonhydraulicpropertiesofhomogenizedandstructuredsoils AT beckerfazekasorsolya effectofbulkdensityonhydraulicpropertiesofhomogenizedandstructuredsoils AT hornrainer effectofbulkdensityonhydraulicpropertiesofhomogenizedandstructuredsoils
_version_	1714203313086398464

EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS

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