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Clay transformations following a leaching experiment on an acid brown soil

Published online by Cambridge University Press:  09 July 2018

M.-P. Turpault ,
Q. Ponette ,
S. Belkacem  and
C. Nys
M.-P. Turpault
Affiliation:
INRA, Cycles Biogéochimiques, 54280 Champenoux, France
Q. Ponette
Affiliation:
INRA, Cycles Biogéochimiques, 54280 Champenoux, France
S. Belkacem
Affiliation:
INRA, Cycles Biogéochimiques, 54280 Champenoux, France
C. Nys
Affiliation:
INRA, Cycles Biogéochimiques, 54280 Champenoux, France
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Abstract

The chemical and mineralogical properties of the A1 and B horizons of an acid brown soil (typic Dystrochrept) were compared before and after a 20 month column leaching experiment. At the end of the leaching period, the organic carbon content of the A1 horizon had decreased by ∼20% compared with the original horizon. In the leached A1 horizon, the vermiculite layers of both the vermiculite and interstratified minerals were transformed into high-charge expanding layers, with the charge mainly located in the octahedral sheet. The inhibition of expansion properties by pretreatment with dithionite-citrate-bicarbonate (DCB) was explained by an increase in total layer charge induced by Fe reduction. In the B horizon, leaching resulted in a loss of sesquioxide materials, especially in the interlayers of vermiculites. In both horizons, the amounts of Al extracted by Na citrate and the amounts of Fe extracted by DCB decreased. Analysis of solution composition showed that Al mobilization was closely associated with NO3− leaching.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 2 , June 1997 , pp. 289 - 297
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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