Chemical migration during soil water retention curve evaluation

Anais da Academia Brasileira de Ciências

Luiz F. Pires²  Felipe C.a. Villanueva¹  Nivea M.p. Dias²  Osny O. Santos Bacchi¹  Klaus Reichardt¹ 

[1] ,Universidade Estadual de Ponta Grossa Laboratório de Física Aplicada a Solos e Ciências Ambientais Ponta Grossa PR ,Brasil

关键词: analytical methods;    soil structure;    wetting-drying cycles;    soil physics;    métodos analíticos;    estrutura do solo;    ciclos de umedecimento e de secamento;    física do solo;   

DOI  :  10.1590/S0001-37652011005000032

来源: SciELO

【 摘 要 】

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 Ca2+, Mg2+ 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 Ca2+, Mg2+ 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.

【 授权许可】

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