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Kaolinite formation from palygorskite and sepiolite in rhizosphere soils

Published online by Cambridge University Press:  01 January 2024

H. Khademi  and
J. M. Arocena
H. Khademi
Affiliation:
Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran
J. M. Arocena*
Affiliation:
Canada Research Chair in Soil and Environmental Sciences, University of Northern British Columbia, 3333 University Way, Prince George, BC, Canada V2N 4Z9
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Palygorskite and sepiolite are fibrous clays that occur mostly in agricultural soils of arid regions. Although many investigations have examined the environmental conditions for the formation and stability of these clays, information on the transformation of these clays in the root zone (or rhizosphere) of agricultural crops is limited. In this study, changes in palygorskite and sepiolite within the rhizosphere of selected agricultural crops were determined and the ability of plants to extract Mg from these minerals compared. Alfalfa, barley, and canola were cultivated in pots under controlled conditions in a growth chamber using growth media that consisted of a mixture of Ottawa sand and clay-sized Florida palygorskite (PFl-1) or Spanish sepiolite (SepSp-1). After 100 days of cultivation, the biomass of plant roots and shoots were determined and Mg uptake measured by inductively coupled plasma analysis of the plant biomass after microwave oven digestion. The clay fraction in each pot was separated from the sand and analyzed using X-ray diffraction (XRD) and examined using transmission electron microscopy (TEM). The XRD reflection at 0.718 nm clearly indicated kaolinite in the rhizosphere after growth of the three crops. Furthermore, hexagonal kaolinite particles were observed, using TEM, and the amount of Mg extracted by the three crops was significantly greater for sepiolite than for palygorskite. Palygorskite and sepiolite kaolinization in the rhizosphere was apparently due: (1) to high acidity in the rhizosphere caused by root activity and organic matter decomposition; and (2) to fibrous clay destabilization caused by Mg uptake by plants. This study shows that kaolinite in agricultural soils of arid and semi-arid regions might be partly due to neoformation after fibrous clay dissolution and not entirely inherited from parent materials, as has been suggested in earlier literature.

Keywords

Kaolinite NeoformationPalygorskiteRhizosphere EffectsSepioliteX-ray Diffraction
Type
Article
Information
Clays and Clay Minerals , Volume 56 , Issue 4 , August 2008 , pp. 429 - 436
Copyright
Copyright © 2008, The Clay Minerals Society

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