Effect of sampling volume on the measurement of soil physical properties: simulation with x-ray tomography data

Baveye, Philippe C.; Rogasik, Helmut; Wendroth, Ole; Onasch, Ingrid; Crawford, John W.

doi:10.1088/0957-0233/13/5/316

Cited by 69 publications

(55 citation statements)

References 34 publications

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“…resultado demonstra que podem ocorrer mudanças importantes na estrutura de amostras de solo produzidas artificialmente em razão de ciclos de U-S. Estas modificações podem se tornar extremamente relevantes é provavelmente diferente do estado anterior, ocorrido antes do primeiro ciclo de umedecimento e secamento (Baumgartl & Köck, 2004). Essa nova estrutura do solo não consegue retornar ao estado de energia original, com reflexos e mudanças no sistema poroso do solo (Bresson & Moran, 2003). Nas regiões com menor porosidade pela imagem a φ já diminui com a aplicação de apenas um ciclo de U-S (Figura 5).…”

Section: Resultsunclassified

“…A dimensão da matriz de dados (47x40 pontos) foi escolhida com o intuito de se obter uma área representativa da amostra (Baveye et al, 2002), distante das bordas, para evitar interferência, nas imagens tomográficas, das interfaces PVC-solo-ar (Herman, 1980 ) são os coeficientes de atenuação de massa do solo e da água, respectivamente, e α é o coeficiente angular entre µ e UT, obtido a partir da calibração do tomógrafo.…”

Section: Methodsunclassified

“…No entanto, o preço desses instrumentos tornava proibitiva a pesquisa aplicada com uso dessa técnica. Cesareo & Giannini (1980) demonstraram ser possível construir tomógrafos computadorizados mais simples e baratos, denominados de primeira geração, que poderiam ser usados em pesquisas em outras áreas de conhecimento além da medicina.…”

Section: Introductionunclassified

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Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

Pires

Bacchi

2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar, em escala milimétrica, a modificação da densidade e da porosidade de amostras deformadas de solo submetidas a ciclos de umedecimento e secamento (U-S), por meio da tomografia computadorizada de raios gama. Amostras com 98,1 cm 3 foram preparadas procedendo ao peneiramento do solo em malha de 2 mm e acondicionamento de forma homogênea em tubos de PVC. As amostras de solo foram submetidas a um, dois e três ciclos de U-S. As amostras controle não foram submetidas a nenhum ciclo de U-S. Após a aplicação dos ciclos de U-S, a porosidade das amostras diminuiu e as camadas de solo se adensaram. Os dados de tomografia computadorizada permitiram análise contínua da densidade do solo e de sua porosidade, em camadas milimétricas (0,08 cm), o que não pode ser alcançado facilmente por métodos tradicionais usados em física do solo.Termos para indexação: análise de imagens, atenuação de raios gama, ciclos de umedecimento e secamento, densidade do solo, porosidade do solo. Soil structure changes evaluated with computed tomographyAbstract -The objective of this work was to evaluate in millimetric scale changes in soil bulk density and porosity, using the gamma-ray computed tomography in soil samples with disturbed structure due to wetting and drying (W-D) cycles. Soil samples with 98.1 cm 3 were sieved using a 2 mm mesh and homogenously packed in PVC cylinders. Soil samples were submitted to 1, 2, and 3 W-D cycles. Control samples were not submitted to W-D cycles. After repetitions of W-D cycles, soil sample porosity decreased and soil layers became denser. Computed tomography allowed a continuous analysis of soil bulk density and also soil porosity along millimetric (0.08 cm) layers, what cannot be provided by traditional methods used in soil physics.

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Section: Resultsunclassified

Section: Methodsunclassified

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Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

Pires

Bacchi

2010

Pesq. agropec. bras.

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“…Based on statistical and geostatistical analysis of data obtained in X-ray CT imagery of soils with different textures, Cı´slerova´and Votrubova ( 2002) concluded that, in the evaluation of the porosity of heterogeneous samples, the scanning direction (vertical or horizontal) seemed to have a greater influence than image resolution (determined by the size of the field of view). On data obtained by Rogasik et al (1999), Baveye et al (2002) demonstrated the dependence of soil physical characteristics (bulk density, volumetric water and air content) on the sample size, shape and positioning. For assessing the soil structural state, Rogasik et al (2003) calculated the standard deviation and the arithmetic mean of HU determined for selected regions of interest (ROIs).…”

Section: Characterization Of Soil Physical Propertiesmentioning

confidence: 96%

Application of X-ray computed tomography to soil science: A literature review

Taina¹,

Heck²,

Elliot³

2008

Can. J. Soil. Sci.

259

126

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T. R. 2008. Application of X-ray computed tomography to soil science: A literature review. Can. J. Soil Sci. 88: 1Á20. The study of the spatial configuration of soil, in its complexity, requires an understanding of the interrelations and interactions between the diverse soil constituents, at various levels of organization. Investigations of the spatial arrangement of the mineral and organic components of soil have benefited from the development of techniques for structural analysis. X-ray computed tomography (CT) is a non-destructive and non-invasive technique that has been successfully used for three-dimensional (3D) examination of soil. Valuable information has been obtained by the application of CT for the description and quantitative measurements of soil structure elements, especially of soil pores and pore network features. In many studies, X-ray CT has been used to investigate the hydro-physical characteristics of the soil, in a functional and temporal manner. A dynamic approach has also been utilized in the evaluation of the biotic factor influence on soil. The analysis of soil solid phases, by X-ray CT, has been challenging due to the similar X-ray attenuation of different solid constituents. However, the use of multiple X-ray energy levels has facilitated the discrimination of minerals in soil. The aim of this review and synthesis is to offer a perspective on the major issues related to application of the technique, general attempted solutions and possible directions in the utilization of X-ray CT in soil research. Relevant scanning parameters, procedures for CT image reconstruction, algorithms for the quantification of soil characteristics and results are presented for each type of application.Key words: X-ray computed tomography, energy level, spatial resolution, segmentation, soil mineral and organic constituents, soil physical and hydro-physical properties, soil biota Taina, I. A., Heck, R. J. et Elliot, T. R. 2008. Application de la tomographie aux rayons X a`la science du sol : survol de la litte´rature. Can. J. Soil Sci. 88: 1Á20. Pour e´tudier la configuration spatiale du sol dans toute sa complexite´, il faut comprendre les relations et les interactions des fractions du sol a`diffe´rents niveaux d'organisation. Les recherches sur l'organisation spatiale des couches mine´rales et organiques du sol ont profite´du de´veloppement de techniques d'analyse structurale. La tomographie aux rayons X assiste´e par ordinateur (TXAO) est une technique non destructive et non invasive qu'on a applique´e avec succe`s a`l'analyse tridimensionnelle du sol. L'usage de la TXAO pour de´crire et quantifier les e´le´ments structuraux du sol, surtout les pores et les particularite´s de leurs re´seaux, a permis de glaner quelques pre´cieuses informations. Maintes e´tudes rapportent qu'on s'est servi de la TXAO pour pre´ciser les proprie´te´s hydrophysiques du sol sur le plan fonctionnel ou temporel. On a aussi recouru a`une approche dynamique pour e´valuer l'influence des facteurs biotiques sur le sol. L'analyse des p...

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“…삼차 원 이미지에서 계산 가능한 토양 특성들로는 공극의 크기, 공극의 부피, 굴곡도, 길이 등이 있다 (Al-Raoush and Willson, 2005). 또한 공극의 형태학적 정보들을 바탕으로 토양 수분의 이동 특성도 예측할 수 있다 (Baveye et al, 2002;Peth et al, 2008). 이러한 공극의 정량적 특성뿐만 아닌 삼차원 이미지를 통해 공극 구조의 다양성도 계산이 가능하다.…”

Section: Introductionunclassified

Comparison of Soil Pore Properties between Anthropogenic and Natural Paddy Field Soils From Computed Tomographic Images

Chun¹,

Jung²,

Choi³

et al. 2015

Korean Journal of Soil Science and Fertilizer

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Human influence on soil formation has dramatically increased with human civilization and industry development. Increase of anthropogenic soils induced researches on the anthropogenic soils; classification, chemical and physical characteristics of anthropogenic soils and plant growth from anthropogenic soils. However there have been no comprehensive analyses on soil pore or physical properties of anthropogenic soils from 3 dimensional images in Korea. The objectives of this study were to characterize physical properties of anthropogenic paddy field soils by depth and to find differences between natural and anthropogenic paddy field soils. Soil samples were taken from two anthropogenic and natural paddy field soils; anthropogenic (A_c) and natural (N_c) paddy soils with topsoil of coarse texture and anthropogenic (A_f) and natural (N_f) paddy soils with topsoil of fine texture. The anthropogenic paddy fields were reestablished during the Arable Land Remodeling Project from 2011 to 2012 and continued rice farming after the project. Natural paddy fields had no artificial changes or disturbance in soil layers up to 1m depth. Samples were taken at three different depths and analyzed for routine physical properties (texture, bulk density, etc.) and pore properties with computer tomography (CT) scans. The CT scan provided 3 dimensional images at resolution of 0.01 mm to calculate pore radius size, length, and tortuosity of soil pores. Fractal and configuration entropy analyses were applied to quantify pore structure and analyze spatial distribution of pores within soil images. The results of measured physical properties showed no clear trend or significant differences across depths or sites from all samples, except the properties from topsoils. The results of pore morphology and spatial distribution analyses provided detailed information of pores affected by human influences. Pore length and size showed significant decrease in anthropogenic soils. Especially, pores of A_c had great decrease in length compared to N_c. Fractal and entropy analyses showed clear changes of pore distributions across sites. The topsoil layer of A_c showed more degradation of pore structure than that of N_c, while pores of A_f topsoil did not show significant degradation compared with those of N_f. These results concluded that anthropogenic soils with coarse texture may have more effects on pore properties than ones with fine texture. The reestablished paddy fields may need more fundamental remediation to improve physical conditions.

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Effect of sampling volume on the measurement of soil physical properties: simulation with x-ray tomography data

Cited by 69 publications

References 34 publications

Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

Application of X-ray computed tomography to soil science: A literature review

Comparison of Soil Pore Properties between Anthropogenic and Natural Paddy Field Soils From Computed Tomographic Images

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