Chemical migration during soil water retention curve evaluation

Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experim...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências 2011-09, Vol.83 (3), p.1097-1108
Main Authors: Pires, Luiz F, Villanueva, Felipe C A, Dias, Nivea M P, Bacchi, Osny O Santos, Reichardt, Klaus
Format: Article
Language:English
Subjects:
analytical methods
Calcium - analysis
ciclos de umedecimento e de secamento
estrutura do solo
física do solo
Magnesium - analysis
MULTIDISCIPLINARY SCIENCES
métodos analíticos
Potassium - analysis
Soil - chemistry
soil physics
soil structure
Spectrophotometry, Atomic
Water Movements
wetting-drying cycles
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Summary:Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca(2+), Mg(2+) and K(+) on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca(2+), Mg(2+) and K(+) during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when samples submitted to the application of several W-D cycles were compared with samples not submitted to it. These differences occurred at the region of both structural and textural pores. A possible explanation for these results could be the soil chemical migration during the sequences of W-D cycles, which can affect the soil structure development.
ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/S0001-37652011005000032