Nature of the clay–cation bond affects soil structure as verified by X-ray computed tomography
Alla Marchuk A C , Pichu Rengasamy A , Ann McNeill A and Anupama Kumar BA Soil Science, School of Agriculture, Food and Wine, Waite Campus, The University of Adelaide, SA 5064, Australia.
B CSIRO Land and Water, Waite Campus, PMB2, Glen Osmond, SA 5064, Australia.
C Corresponding author. Email: alla.marchuk@adelaide.edu.au
Soil Research 50(8) 638-644 https://doi.org/10.1071/SR12276
Submitted: 17 September 2012 Accepted: 30 October 2012 Published: 14 January 2013
Abstract
Non-destructive X-ray computed tomography (µCT) scanning was used to characterise changes in pore architecture as influenced by the proportion of cations (Na, K, Mg, or Ca) bonded to soil particles. These observed changes were correlated with measured saturated hydraulic conductivity, clay dispersion, and zeta potential, as well as cation ratio of structural stability (CROSS) and exchangeable cation ratio. Pore architectural parameters such as total porosity, closed porosity, and pore connectivity, as characterised from µCT scans, were influenced by the valence of the cation and the extent it dominated in the soil. Soils with a dominance of Ca or Mg exhibited a well-developed pore structure and pore interconnectedness, whereas in soil dominated by Na or K there were a large number of isolated pore clusters surrounded by solid matrix where the pores were filled with dispersed clay particles. Saturated hydraulic conductivities of cationic soils dominated by a single cation were dependent on the observed pore structural parameters, and were significantly correlated with active porosity (R2 = 0.76) and pore connectivity (R2 = 0.97). Hydraulic conductivity of cation-treated soils decreased in the order Ca > Mg > K > Na, while clay dispersion, as measured by turbidity and the negative charge of the dispersed clays from these soils, measured as zeta potential, decreased in the order Na > K > Mg > Ca.
The results of the study confirm that structural changes during soil–water interaction depend on the ionicity of clay–cation bonding. All of the structural parameters studied were highly correlated with the ionicity indices of dominant cations. The degree of ionicity of an individual cation also explains the different effects caused by cations within a monovalent or divalent category. While sodium adsorption ratio as a measure of soil structural stability is only applicable to sodium-dominant soils, CROSS derived from the ionicity of clay–cation bonds is better suited to soils containing multiple cations in various proportions.
Additional keywords: ECR, CT scanning, soil porosity, soil structure.
References
Aylmore LAG (1993) The use of computer assisted tomography in studying water movement around plant roots. Advances in Agronomy 49, 1–54.| The use of computer assisted tomography in studying water movement around plant roots.Crossref | GoogleScholarGoogle Scholar |
Basile A, Buttafuoco G, Mele G, Tedeschi A (2012) Complementary techniques to assess physical properties of a fine soil irrigated with saline water. Environmental Earth Sciences 66, 1797–1807.
| Complementary techniques to assess physical properties of a fine soil irrigated with saline water.Crossref | GoogleScholarGoogle Scholar |
Bhattad P, Willson CS, Thompson KE (2011) Effect of network structure on characterization and flow modeling using X-ray micro-tomography images of granular and fibrous porous media. Transport in Porous Media 90, 363–391.
| Effect of network structure on characterization and flow modeling using X-ray micro-tomography images of granular and fibrous porous media.Crossref | GoogleScholarGoogle Scholar |
Cárdenas JP, Santiago A, Tarquis AM, Losada JC, Borondo F, Benito RM (2012) Community structure in a soil porous system. Soil Science 177, 81–87.
| Community structure in a soil porous system.Crossref | GoogleScholarGoogle Scholar |
Churchman GJ, Payne D (1983) Mercury intrusion porosimetry of some New-Zealand soils in relation to clay mineralogy and texture. Journal of Soil Science 34, 437–451.
| Mercury intrusion porosimetry of some New-Zealand soils in relation to clay mineralogy and texture.Crossref | GoogleScholarGoogle Scholar |
Crestana S, Cesareo R, Mascarenhas S (1986) Using a computed-tomography miniscanner in soil science. Soil Science 142, 56–61.
| Using a computed-tomography miniscanner in soil science.Crossref | GoogleScholarGoogle Scholar |
Darling AL, Sun W (2004) 3D microtomographic characterization of precision extruded poly-epsilon-caprolactone scaffolds. Journal of Biomedical Materials Research. Part B, Applied Biomaterials 70B, 311–317.
| 3D microtomographic characterization of precision extruded poly-epsilon-caprolactone scaffolds.Crossref | GoogleScholarGoogle Scholar |
El Swaify SA, Ahmed S, Swindale LD (1970) Effect of adsorbed cations on physical properties of tropical red and tropical black earths. Journal of Soil Science 21, 188–198.
| Effect of adsorbed cations on physical properties of tropical red and tropical black earths.Crossref | GoogleScholarGoogle Scholar |
Emerson W, Smith BH (1970) Magnesium, organic matter and soil structure. Nature 228, 453–454.
| Magnesium, organic matter and soil structure.Crossref | GoogleScholarGoogle Scholar |
FAO (2006) Water dispersible clay. In ‘World reference base for soil resources 2006: a framework for international classification, correlation and communication’. (Food and Agricultural Organisation of the United Nations: Rome)
Gaskin PN, Raymond GP (1973) Pore size distribution as a frost susceptibility criterion. In ‘Proceedings of the Symposium on Frost Action on Roads’. Norwegian Road Research Laboratory, Oslo. pp. 76–78. (OECD: Paris)
Gee GW, Bauder JW (1986) Particle-size analysis. In ‘Methods of soil analysis: Part 1. Physical and mineralogical methods’. Vol. 9. 2 edn (Ed. A Klute) pp. 383-411. (ASA, SSSA: Madison, WI)
Hainsworth JM, Aylmore LAG (1983) The use of computer assisted tomography to determine spatial distribution of soil water content. Australian Journal of Soil Research 21, 435–443.
| The use of computer assisted tomography to determine spatial distribution of soil water content.Crossref | GoogleScholarGoogle Scholar |
Hoag RS, Price JS (1997) The effects of matrix diffusion on solute transport and retardation in undisturbed peat in laboratory columns. Journal of Contaminant Hydrology 28, 193–205.
| The effects of matrix diffusion on solute transport and retardation in undisturbed peat in laboratory columns.Crossref | GoogleScholarGoogle Scholar |
Huheey J, Keiter E, Keiter R (1993) ‘Inorganic chemistry: Principles of structure and reactivity.’ (Harper Collins College Publishers: New York)
Isbell RF (2002) ‘The Australian Soil Classification.’ Australian Soil and Land Survey Handbook Series 4. (CSIRO Publishing: Melbourne)
Keren R (1991) Specific effect of magnesium on soil erosion and water infiltration. Soil Science Society of America Journal 55, 783–787.
| Specific effect of magnesium on soil erosion and water infiltration.Crossref | GoogleScholarGoogle Scholar |
Lipiec J, Hajnos M, Swieboda R (2012) Estimating effects of compaction on pore size distribution of soil aggregates by mercury porosimeter. Geoderma 179, 20–27.
| Estimating effects of compaction on pore size distribution of soil aggregates by mercury porosimeter.Crossref | GoogleScholarGoogle Scholar |
Marchuk A, Rengasamy P (2011) Clay behaviour in suspension is related to the ionicity of clay–cation bonds. Applied Clay Science 53, 754–759.
| Clay behaviour in suspension is related to the ionicity of clay–cation bonds.Crossref | GoogleScholarGoogle Scholar |
Matrecano M (2012) Porous media characterisation by micro-tomographic image processing. PhD Thesis, Università di Napoli Federico II, Italy.
Mooney SJ, Pridmore TP, Helliwell J, Bennett MJ (2012) Developing X-ray computed tomography to non-invasively image 3-D root systems architecture in soil. Plant and Soil 352, 1–22.
| Developing X-ray computed tomography to non-invasively image 3-D root systems architecture in soil.Crossref | GoogleScholarGoogle Scholar |
Pauling L (1967) ‘The chemical bond.’ (Cornell University Press: Ithaca, NY)
Pender MJ, Kikkawa N, Liu P (2009) Macro-void structure and permeability of Auckland residual clay. Geotechnique 59, 773–778.
| Macro-void structure and permeability of Auckland residual clay.Crossref | GoogleScholarGoogle Scholar |
Ravina I (1973) The mechanical and physical behaviour of Ca-clay soil and K-clay soil. In ‘Ecological studies. IV. Physical aspects of soil water and salts in ecosystems’. (Eds A Hadas, D Swartzendruber, PE Rijtema, M Fuchs, B Yaron) pp. 131–140. (Springer: Berlin)
Rayment G, Lyons D (2011) ‘Soil chemical methods—Australasia.’ (CSIRO Publishing: Melbourne)
Rengasamy P, Marchuk A (2011) Cation ratio of soil structural stability (CROSS). Soil Research 49, 280–285.
| Cation ratio of soil structural stability (CROSS).Crossref | GoogleScholarGoogle Scholar |
Rengasamy P, Sumner ME (1998) Processes involved in sodic behaviour. In ‘Sodic soils. Distribution, properties, management, and environmental consequences’. (Eds ME Sumner, R Naidu) pp. 35–50. (New York Press: New York)
Rengasamy P, Greene RSB, Ford GW (1986) Influence of magnesium on aggregate stability in sodic red-brown earths. Australian Journal of Soil Research 24, 229–237.
| Influence of magnesium on aggregate stability in sodic red-brown earths.Crossref | GoogleScholarGoogle Scholar |
Smiles D, Smith C (2004) A survey of the cation content of piggery effluents and some consequences of their use to irrigate soil. Australian Journal of Soil Research 42, 231–246.
| A survey of the cation content of piggery effluents and some consequences of their use to irrigate soil.Crossref | GoogleScholarGoogle Scholar |
Speirs SD, Cattle SR, Melville GJ (2011) Impact of sodium adsorption ratio of irrigation water on the structural form of two Vertosols used for cotton production. Soil Research 49, 481–493.
| Impact of sodium adsorption ratio of irrigation water on the structural form of two Vertosols used for cotton production.Crossref | GoogleScholarGoogle Scholar |
Sposito G (1989) ‘The chemistry of soils.’ pp. 249–250. (Oxford University Press: New York)
Taina IA, Heck RJ, Elliot TR, Scaiff N (2010) Micromorphological and X-ray mu CT study of Orthic Humic Gleysols under different management conditions. Geoderma 158, 110–119.
| Micromorphological and X-ray mu CT study of Orthic Humic Gleysols under different management conditions.Crossref | GoogleScholarGoogle Scholar |
Turner M, Sakellariou A, Arns C, Sok R, Limaye A, Senden T, Tiacktedt M (2003) Towards measuring regolith permeability with high resolution x-ray tomography. In ‘Advances in regolith’. (Ed. IC Roach) pp. 421–425. (CRC LEME: Adelaide, S. Aust)
Vergés E, Tost D, Ayala D, Ramos E, Grau S (2011) 3D pore analysis of sedimentary rocks. Sedimentary Geology 234, 109–115.
| 3D pore analysis of sedimentary rocks.Crossref | GoogleScholarGoogle Scholar |
Vogel HJ (2000) A numerical experiment on pore size, pore connectivity, water retention, permeability, and solute transport using network models. European Journal of Soil Science 51, 99–105.
| A numerical experiment on pore size, pore connectivity, water retention, permeability, and solute transport using network models.Crossref | GoogleScholarGoogle Scholar |
Vogel HJ, Weller U, Schlüter S (2010) Quantification of soil structure based on Minkowski functions. Computers Geosciences 36, 1236–1245.
| Quantification of soil structure based on Minkowski functions.Crossref | GoogleScholarGoogle Scholar |
Walkley A, Black IA (1934) An examination of the Degtjareff Method for determining soil organic matter, and a proposed modification of the chromic acid titration method. Soil Science 37, 29–38.
| An examination of the Degtjareff Method for determining soil organic matter, and a proposed modification of the chromic acid titration method.Crossref | GoogleScholarGoogle Scholar |
