Spatial variability of some soil shrinkage indices in hilly calcareous region of western Iran

Zolfaghari, Zahra Sadat; Ayoubi, Shamsollah; Mosaddeghi, Mohammad Reza

doi:10.1016/j.still.2015.01.016

Cited by 19 publications

(6 citation statements)

References 48 publications

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“…Correlations between concentrations of La and Ce and magnetometric measures were investigated using Spearman's correlation coefficient. Spatial correlations of κ values measured on the soil surface and concentrations of La and Ce were analyzed using variograms (Goovaerts 1997;Zawadzki and Fabijańczyk 2007;Zolfaghari et al 2015). Experimental variograms were calculated according to the formula:…”

Section: Statistical and Spatial Analysesmentioning

confidence: 99%

Towards magnetometric characterization of soil pollution with rare-earth elements in industrial areas of Upper Silesian Industrial Area, Southern Poland

2019

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The paper presents systematic study concentrations of selected rare-earth elements, namely La and Ce in soils of highly industrialized regions using geochemical and magnetometric measurements as well as geostatistical methods. Soil magnetometry was used to determine if the concentrations of La and Ce in soil could be a result of anthropogenic pollution or natural soil properties. Results of analyses revealed that the highest concentrations of La and Ce were observed near a waste heap of the plant producing and processing batteries, and in the region of the Jizera Mountains, natural REE-rich minerals are very common. It was also found that the lowest concentrations of La and Ce in soil were observed in forested areas of where the dominant type of pollution sources was associated with the metallurgical industry. Distributions of magnetic susceptibility in soil profiles collected in areas with predominant industrial influence showed visible peak in topsoil, what confirmed anthropogenic origin of La and Ce in soil. In areas where large volumes of wastes were deposited in past, industrial activity, vertical distributions of soil magnetic susceptibility showed also secondary, strong peak in subsoil. Thus, the results reveal that magnetometric measurements in soil profile might be useful as supplementary method for analyzing of concentrations of rare-earth elements. Contrary, magnetometric measurements performed on the soil surface were poorly correlated with a concentration of La and Ce in soil, because they have weaker magnetic properties than typical fly ashes emitted by industry.

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Section: Statistical and Spatial Analysesmentioning

confidence: 99%

Towards magnetometric characterization of soil pollution with rare-earth elements in industrial areas of Upper Silesian Industrial Area, Southern Poland

2019

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“…However, only a few studies have examined the spatial distribution of soil properties at the field level in the Canadian Prairies (Hereafter referred to as Prairies) (Manning et al 2001;Thibodeau et al (2007 and, Whetter et al 2008) Texture affects soil physical, chemical, biological properties and processes thus playing an important role in crop growth and nutrient distribution. Texture influences soil physical properties such as bulk density, porosity, pore size distribution, and aggregate stability (Chaudhari et al 2013;Ding et al 2016;Mamedov et al 2016;Wang et al 2014), which, in turn, impacts soil water and nutrient retention and movement (Mamedov et al 2016;Safadoust et al 2014), root penetration (Tracy et al 2013) soil compaction (Newell-Price et al 2013) and shrinkage characteristics (Zolfaghari et al 2015). Texture also affects soil chemical processes such as nitrogen mineralization and subsequent leaching (Castellano et al 2013), denitrification (Jamali et al 2016), phosphorus accumulation and leaching (Suñer and Galantini 2015) and contaminant distribution (Dousova et al 2016).…”

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confidence: 99%

Importance of terrain attributes in relation to the spatial distribution of soil properties at the micro scale: a case study

et al. 2018

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Micro-topography and spatial variability of soil properties influence the environmental consequences of site-specific management. This study investigated the spatial structure of soil properties in relation to the micro-topography of an agricultural field in the Canadian Prairies. The geospatial sampling scheme had 178 soil cores to a depth of 120 cm. Soil texture and soil water content (SWC) at 0-120 cm, total nitrogen (TN), total carbon (TC) and soil organic carbon (SOC) at 0-15 cm were measured and spatially interpolated using semi-variograms calculated with GS+. The correlation of terrain attributes, calculated from digital elevation models, with soil properties was also assessed. Texture was strongly spatially dependent in the surface layers, and the significance of spatial dependency declined with depth. Spatial autocorrelation of sand content declined from 96% at the soil surface (0-15 cm) to 90% at 30-45 cm, 53% at 75-90 cm. SWC, TC, TN and SOC were similarly autocorrelated. Elevation, relative slope position and vertical distance to channel network influenced the distribution of texture and SWC based on analysis with partial least squares, though this relationship

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“…Soil in the surface layer (L1) had a relatively small shrinkage potential, which could be attributed to the loose, well‐aggregated structure. Peng and Horn (2005) and Zolfaghari et al (2015) reported that organic matter had a reducing effect on the relative shrinkage in the structural phase. Soil in L1 was characterized by bimodal pore size distribution corresponding to the interaggregate (structural) and interparticle (textural) pores.…”

Section: Discussionmentioning

confidence: 99%

A Novel and Facile Method for Characterizing Shrinkage Geometry along the Granitic Soil Profile

Wei

Xue-yin

et al. 2018

Soil Science Soc of Amer J

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A simple and facile approach was proposed for measuring the anisotropic shrinkage. Subsidence was dominant for soils in the loose and aggregated structure. Horizontal shrinkage was predominant for soils with the horizontal arrangement of plate particles The shrinkage behavior of granite soils was controlled by clay content and pore structure. Soil volume change resulting from frequent drying–wetting cycles leads to severe erosion and landslides in granite regions. Limited attempts have been made to investigate the shrinkage geometry of these soils. Here, a new method was proposed for characterizing soil shrinkage behavior by testing cylindrical specimens of undisturbed granitic soils sampled separately in vertical and horizontal directions at the pedogenic layers (i.e., surface [L1], lateritic [L2 and L3], sandy [L4], and detritus [L5] layers). For L1, the coefficient of linear extensibility (COLE) was larger in the vertical than in the horizontal direction, whereas it was the opposite for L2 and L3. For L4 and L5, the COLE showed no significant differences between the two directions. A modified van Genuchten equation fitted well with the COLE curves (p < 0.01). The shrinkage potential decreased in the order of L3 > L2 > L1, L4 > L5. Subsidence was dominant for the L1 soil due to the loose‐aggregated structure, whereas cracking was dominant in the lateritic layer soils due to the horizontal arrangement of clay particles. The shrinkage geometry for L4 and L5 was largely determined by soil structure inherited from the configuration of granite rock. The shrinkage behavior of granite soils was controlled by clay content and pore structure. This new method of measuring shrinkage geometry is accurate, low cost, nondestructive, and labor saving but remains to be improved and validated on a wide range of soil types.

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Spatial variability of some soil shrinkage indices in hilly calcareous region of western Iran

Cited by 19 publications

References 48 publications

Towards magnetometric characterization of soil pollution with rare-earth elements in industrial areas of Upper Silesian Industrial Area, Southern Poland

Towards magnetometric characterization of soil pollution with rare-earth elements in industrial areas of Upper Silesian Industrial Area, Southern Poland

Importance of terrain attributes in relation to the spatial distribution of soil properties at the micro scale: a case study

A Novel and Facile Method for Characterizing Shrinkage Geometry along the Granitic Soil Profile

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