Effect of soil compaction on hydraulic properties of two loess soils in China

Zhang, Shulan; Grip, Harald; Lövdahl, Lars

doi:10.1016/j.still.2005.08.012

Cited by 114 publications

(73 citation statements)

References 23 publications

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“…The WRCs of these soils at the different compacted states were predicted using the approach presented by Assouline [2006a], and the pore radius, r a , corresponding to air entry value, y a , for each soil was calculated. The second subset includes four soil types: Toyoura sand, Kunigami maji light clay and a sandy loam from volcanic ash origin [Miyazaki, 1996], Poudre fine sand [Smith and Woolhiser, 1971], Ottawa sand [Kameda, 2004], and Mizhi silt loam [Zhang et al, 2006]. The relevant data for these soils were digitized from reported figures.…”

Section: Experimental Data and Methodologymentioning

confidence: 99%

“…Smith and Woolhiser [1971] measured the hydraulic functions of the Poudre Fine Sand in the laboratory for three different porosities. Zhang et al [2006] measured the water retention curves and the hydraulic conductivity of undisturbed samples collected at two depths, 0 -5 cm and 10-15 cm, from agricultural fields located in Mihzi and Heyang, in the Loess Plateau of China.…”

Section: Experimental Data and Methodologymentioning

confidence: 99%

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Air entry–based characteristic length for estimation of permeability of variably compacted earth materials

Assouline

Or²

2008

Water Resources Research

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[1] The permeability k of a porous medium is a geometrical pore space attribute required for quantifying fluid flows and transport processes for hydrological, civil, agriculture, and petroleum engineering applications. Permeability is often expressed as proportional to a characteristic length squared and inversely proportional to factors accounting for porosity, pore shape, and tortuosity effects. Compaction and diagenesis reduce porosity, mean pore size, and connectivity, resulting in decrease in k. Permeability prediction relies on suitable selection of a characteristic length that may vary from simple hydraulic radius approximation of Kozeny-Carman to more complex critical path analysis to identify flow-limiting pore size. For porous media undergoing significant changes in pore space (e.g., compaction due to anthropogenic activities), the proper choice of a robust characteristic length is particularly challenging. We propose using the air entry pressure, a natural characteristic length that gauges the largest drainable pore size. This choice of a characteristic length is compatible with the Aissen formula that provides robust estimates of k for complex pore shapes. Additionally, the model considers geometrical (tortuosity) factors and links relative changes in porosity to concurrent changes in k. The model was tested against experimental data for sands, sandstones with different cementing agents, and unconsolidated soils. For unconsolidated sands and soils the model provides reasonable predictions of permeability for the entire range of porosities determined in laboratory or field experiments. However, for sandstones, and especially those containing cementing agents such as clay, the model is valid up to a critical porosity where hydraulic connectivity is lost, resulting in drastic reduction in k. The geometrical factor for soils was influenced by silt-to-clay ratio, while for sands, it was correlated with mean grain diameter. The model offers improvement in predicting k and provides a means for incorporating critical pore size and connectivity information in addition to porosity.

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Section: Experimental Data and Methodologymentioning

confidence: 99%

Section: Experimental Data and Methodologymentioning

confidence: 99%

Air entry–based characteristic length for estimation of permeability of variably compacted earth materials

Assouline

Or²

2008

Water Resources Research

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“…La compactación es una de las más importantes limitaciones físicas del suelo en las actividades ganaderas y agrícolas, la cual a través del tiempo y con la persistencia de sus causas, puede alcanzar capas más profundas cuando no se toman acciones correctivas; por esta razón, se señala que procesos bióticos y abióticos como las enmiendas orgánicas y los tratamientos físicos del suelo, son métodos efectivos para recuperar esta propiedad (boivin et al, 2006;Zhang et al, 2006).…”

Section: Artícu Lo De I Nvestigaciónunclassified

Producción de forraje y respuesta animal en suelos del valle del Cesar en proceso de recuperación

Roncallo

Murillo

Rodriguez

et al. 2012

CTA

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El 90% de los suelos con potencial agropecuario en el departamento del Cesar (Colombia) están afectados por diversos grados de deterioro, impactando de manera negativa la producción ganadera, la cual es una de las actividades económicas más importantes de la región. El objetivo del estudio fue contribuir con la recuperación de las praderas degradadas, avanzar en el rescate de la capacidad productiva de las áreas afectadas y en el mejoramiento de la sostenibilidad y competitividad de la producción de carne bovina en esta región, mediante la implementación de prácticas sostenibles en el manejo de los suelos. En la evaluación de las ganancias de peso se aplicó un diseño completamente al azar con medidas repetidas en el tiempo y la información obtenida se sometió a análisis de varianza. Se aplicaron prácticas sostenibles consistentes en labranza apropiada, incorporación de abonos verdes (Vigna unguiculata), establecimiento de cobertura vegetal con gramíneas y leguminosas asociadas (Bothriochloa pertusa, Leucaena leucocephala y Clitoria ternatea) y rotación de potreros. Se realizó una evaluación comparativa de la producción de forraje y de las ganancias de peso con terneros de levante. Los resultados revelaron un aumento de la producción de materia seca por unidad de área y de las ganancias de peso/animal/día, las cuales fueron superiores (P≤0,05) en 44,2% y 46,3%, respectivamente, donde se aplicaron prácticas sostenibles comparadas con el testigo; se obtuvo mayor (P≤0,05) ganancia de peso/ha en el tratamiento experimental (230,5 kg ha-1) en relación con el testigo (145,7 kg ha-1). Forage production and animal response in soils in the Cesar valley under a recovery processThe 90% of potential agricultural soils in Cesar (Colombia) are affected by varying degrees of impairment, negatively impacting livestock production, which is one of the most important economic activities in the region. The aim of the study was to contribute to the recovery of degraded grasslands, to progress in rescuing the productive capacity of the affected areas and to improve the sustainability and competitiveness of beef production in this region, by implementing practices in sustainable land management. In assessing weight gains, a completely randomized design was used with repeated measurements over time and the obtained data was subjected to analysis of variance. Sustainable practices were used consisting of appropriate tillage, green manure (Vigna unguiculata), establishment of vegetation with grasses and legumes (Bothriochloa pertusa, Leucaena leucocephala and Clitoria ternatea) and rotational grazing. We performed a comparative evaluation of feed production and weight gains in calves. The results revealed an increase in dry matter production per unit area and weight gain/animal/day which increased (P≤0.05) by 44.2% and 46.3%, respectively where sustainable practices were applied compared to the control; the highest (P≤0.05) weight gain / ha was seen in the experimental treatment (230.5 kg ha-1) in relation to the control (145.7 kg ha-1).

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“…These results can be explained by the effect of machinery traffic on the experimental area, which resulted in different degrees of soil compaction. Compaction alters the original soil structure due to the rearrangement of aggregates in the matrix and causes air expulsion, reducing the total pore space (Gupta & Allmaras, 1987) by the transformation of larger diameter pores to smaller ones (Dexter, 2004;Zhang et al, 2006). This causes an increment of BD (Gupta et al, 1989;Hill, 1990, Hakansson & Voorhees, 1998 and raises capillary forces that influence water retention (Zhang et al, 2006), resulting in a narrower range of θ and BD in-between crop rows.…”

Section: Soil Resistance To Penetrationmentioning

confidence: 99%

Improvement of a testing apparatus for dynamometry: procedures for penetrometry and influence of strain rate to quantify the tensile strength of soil aggregates

Figueiredo

Silva

Tormena

et al. 2011

Rev. Bras. Ciênc. Solo

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SUMMARYSoil penetration resistance (PR) and the tensile strength of aggregates (TS) are commonly used to characterize the physical and structural conditions of agricultural soils. This study aimed to assess the functionality of a dynamometry apparatus by linear speed and position control automation of its mobile base to measure PR and TS. The proposed equipment was used for PR measurement in undisturbed samples of a clayey "Nitossolo Vermelho eutroférrico" (Kandiudalfic Eutrudox) under rubber trees sampled in two positions (within and between rows). These samples were also used to measure the volumetric soil water content and bulk density, and determine the soil resistance to penetration curve (SRPC). The TS was measured in a sandy loam "Latossolo Vermelho distrófico" (LVd) -Typic Haplustox -and in a very clayey "Nitossolo Vermelho distroférrico" (NVdf) -Typic Paleudalf -under different uses: LVd under "annual crops" and "native forest", NVdf under "annual crops" and "eucalyptus plantation" (> 30 years old). To measure TS, different strain rates were applied using two dynamometry testing devices: a reference machine (0.03 mm s -1 ), which has been widely used in other studies, and the proposed equipment

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Effect of soil compaction on hydraulic properties of two loess soils in China

Cited by 114 publications

References 23 publications

Air entry–based characteristic length for estimation of permeability of variably compacted earth materials

Air entry–based characteristic length for estimation of permeability of variably compacted earth materials

Producción de forraje y respuesta animal en suelos del valle del Cesar en proceso de recuperación

Improvement of a testing apparatus for dynamometry: procedures for penetrometry and influence of strain rate to quantify the tensile strength of soil aggregates

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