Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability
Identifieur interne : 003F98 ( PascalFrancis/Curation ); précédent : 003F97; suivant : 003F99Multifractal analysis of Hg pore size distributions in soils with contrasting structural stability
Auteurs : J. Paz Ferreiro [Espagne] ; E. Vidal Vazquez [Espagne]Source :
- Geoderma : (Amsterdam) [ 0016-7061 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Système multifractal, Eau pluie, Dimension pore, Distribution dimension, Sol agricole, Stabilité structurale, Porosité, Aménagement sol, Structure sol, Mercure, Injection, Couche superficielle, Pluie, Matière organique, Limon, Sensibilité résistance, Surface sol, Sol limoneux fin, Till, Espagne, Galice.
- Wicri :
English descriptors
- KwdEn :
Abstract
Parameters are needed to recognize and monitor changes in pore size distributions (PSD) caused by factors such as differences in soil management systems or by disturbance of the soil structure. The objectives of this work were to evaluate the potential of multifractal parameters obtained from mercury injection porosimetry (MIP) curves to distinguish between two soils with contrasting structure stability indices and between distinct stages of the surface of these soils. Samples were collected from the uppermost surface layer of two agricultural soils, before and after simulated rainfall. The first soil was loamy textured, with 4.61% organic matter content and a mean weight diameter (MWD) of 2.136 mm. The second soil was a silty loam with 2.17% organic matter content and a MWD of 0.262 mm, highly susceptible to crusting. Crusted soil surfaces were produced by cumulative 260 mm and 140 mm simulated rainfall on the loamy and the silty loam soil, respectively. Ten replicated samples from the initial freshly-tilled and the crusted soil surfaces were analyzed. In the diameter range of 100-0.005 μm, the freshly-tilled surface of the loamy soil had a significantly (p<0.05) higher pore volume than its rain-disturbed counterpart, whereas the respective pore volume of the silty loam soil slightly increased following simulated rain. The scaling properties of PSDs measured by MIP could be fitted reasonably well with multifractal models. Generalized dimension spectrum, Dq, led to a better definition of multifractal scaling than singularity spectrum, f(α). Multifractal parameters such as Hölder exponent of order zero, α0, aperture of the left part of the singularity spectrum (α0-αq+), entropy dimension, D1, correlation dimension, D2, as well as indexes (D0-D1) and (D0-D2) were significantly different between the structurally stable loamy soil and the silty loam soil prone to crusting and between initial and rain-disturbed surface stages (p<0.05). Moreover, D1 and (D0-D1) were also significantly affected by the interaction between soil type and surface stage. Parameter α0 ranked as: loam initial1. Consequently, low structural stability or stability decay due to disaggregation by rainfall lead to clustering of PSDs measured by Hg intrusion porosimetry. These results show that multifractal analysis of PSDs may be an appropriate tool for characterizing soil structure stability and also a suitable indicator for assessing soil surface evolution stages.
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<series><title level="j" type="main">Geoderma : (Amsterdam)</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Agricultural soil</term>
<term>Galicia Spain</term>
<term>Ground surface</term>
<term>Multifractal system</term>
<term>Pore size</term>
<term>Sensitivity resistance</term>
<term>Silt loam soil</term>
<term>Soil structure</term>
<term>Spain</term>
<term>Structure stability</term>
<term>Surface layer</term>
<term>injection</term>
<term>loam</term>
<term>mercury</term>
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<term>porosity</term>
<term>rain water</term>
<term>rainfall</term>
<term>size distribution</term>
<term>soil management</term>
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<term>Stabilité structurale</term>
<term>Porosité</term>
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<term>Structure sol</term>
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<term>Injection</term>
<term>Couche superficielle</term>
<term>Pluie</term>
<term>Matière organique</term>
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<term>Sensibilité résistance</term>
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<term>Sol limoneux fin</term>
<term>Till</term>
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<front><div type="abstract" xml:lang="en">Parameters are needed to recognize and monitor changes in pore size distributions (PSD) caused by factors such as differences in soil management systems or by disturbance of the soil structure. The objectives of this work were to evaluate the potential of multifractal parameters obtained from mercury injection porosimetry (MIP) curves to distinguish between two soils with contrasting structure stability indices and between distinct stages of the surface of these soils. Samples were collected from the uppermost surface layer of two agricultural soils, before and after simulated rainfall. The first soil was loamy textured, with 4.61% organic matter content and a mean weight diameter (MWD) of 2.136 mm. The second soil was a silty loam with 2.17% organic matter content and a MWD of 0.262 mm, highly susceptible to crusting. Crusted soil surfaces were produced by cumulative 260 mm and 140 mm simulated rainfall on the loamy and the silty loam soil, respectively. Ten replicated samples from the initial freshly-tilled and the crusted soil surfaces were analyzed. In the diameter range of 100-0.005 μm, the freshly-tilled surface of the loamy soil had a significantly (p<0.05) higher pore volume than its rain-disturbed counterpart, whereas the respective pore volume of the silty loam soil slightly increased following simulated rain. The scaling properties of PSDs measured by MIP could be fitted reasonably well with multifractal models. Generalized dimension spectrum, Dq, led to a better definition of multifractal scaling than singularity spectrum, f(α). Multifractal parameters such as Hölder exponent of order zero, α<sub>0</sub>
, aperture of the left part of the singularity spectrum (α<sub>0</sub>
-α<sub>q+</sub>
), entropy dimension, D<sub>1</sub>
, correlation dimension, D<sub>2</sub>
, as well as indexes (D<sub>0</sub>
-D<sub>1</sub>
) and (D<sub>0</sub>
-D<sub>2</sub>
) were significantly different between the structurally stable loamy soil and the silty loam soil prone to crusting and between initial and rain-disturbed surface stages (p<0.05). Moreover, D<sub>1</sub>
and (D<sub>0</sub>
-D<sub>1</sub>
) were also significantly affected by the interaction between soil type and surface stage. Parameter α<sub>0</sub>
ranked as: loam initial<sub>1</sub>
. Consequently, low structural stability or stability decay due to disaggregation by rainfall lead to clustering of PSDs measured by Hg intrusion porosimetry. These results show that multifractal analysis of PSDs may be an appropriate tool for characterizing soil structure stability and also a suitable indicator for assessing soil surface evolution stages.</div>
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, aperture of the left part of the singularity spectrum (α<sub>0</sub>
-α<sub>q+</sub>
), entropy dimension, D<sub>1</sub>
, correlation dimension, D<sub>2</sub>
, as well as indexes (D<sub>0</sub>
-D<sub>1</sub>
) and (D<sub>0</sub>
-D<sub>2</sub>
) were significantly different between the structurally stable loamy soil and the silty loam soil prone to crusting and between initial and rain-disturbed surface stages (p<0.05). Moreover, D<sub>1</sub>
and (D<sub>0</sub>
-D<sub>1</sub>
) were also significantly affected by the interaction between soil type and surface stage. Parameter α<sub>0</sub>
ranked as: loam initial<sub>1</sub>
. Consequently, low structural stability or stability decay due to disaggregation by rainfall lead to clustering of PSDs measured by Hg intrusion porosimetry. These results show that multifractal analysis of PSDs may be an appropriate tool for characterizing soil structure stability and also a suitable indicator for assessing soil surface evolution stages.</s0>
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<s5>21</s5>
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<fC03 i1="16" i2="X" l="ENG"><s0>Sensitivity resistance</s0>
<s5>21</s5>
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<fC03 i1="16" i2="X" l="SPA"><s0>Sensibilidad resistencia</s0>
<s5>21</s5>
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<s5>23</s5>
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<s5>23</s5>
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<s2>NT</s2>
<s5>24</s5>
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<fC03 i1="18" i2="X" l="ENG"><s0>Silt loam soil</s0>
<s2>NT</s2>
<s5>24</s5>
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<s2>NT</s2>
<s5>24</s5>
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<s5>25</s5>
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<s5>25</s5>
</fC03>
<fC03 i1="19" i2="2" l="SPA"><s0>Till</s0>
<s5>25</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Espagne</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>Spain</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="20" i2="2" l="SPA"><s0>España</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="21" i2="2" l="FRE"><s0>Galice</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="21" i2="2" l="ENG"><s0>Galicia Spain</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="21" i2="2" l="SPA"><s0>Galicia</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE"><s0>Péninsule Ibérique</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Iberian Peninsula</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Península ibérica</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Europe Sud</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Southern Europe</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Europa Sur</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="03" i2="2" l="SPA"><s0>Europa</s0>
<s2>564</s2>
</fC07>
<fN21><s1>094</s1>
</fN21>
</pA>
</standard>