Ion Transport Dynamics in Acid Variable Charge Subsoils |
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Authors: | Nikolla P. Qafoku Malcolm E. Sumner Mitsuru Toma |
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Affiliation: | Battelle, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, WA 99352, USA;;University of Georgia, Athens, GA 30602, USA;;Experimental Farm, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 753–8515 Japan |
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Abstract: | This is a mini-review of the research work conducted by the authors with the objective of studying ion transport in variable charge subsoils collected from different areas around the world. An attempt is made in these studies to relate the unique behavior manifested during ionic transport in these subsoils with their mineralogical, physical and chemical properties, which are markedly different from those in soils from temperate regions. The variable charge subsoils have a relatively high salt sorption capacity and anion exchange capacity (AEC) that retards anions downward movement. The AEC correlates closely with the anion retardation coefficients. Ca2+ applied with gypsum in topsoil may be transported to the subsoil and may improve the subsoil chemical properties. These results may help in developing appropriate management strategies under a range of mineralogical, physical, and chemical conditions. |
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Keywords: | acid soils AEC ion transport surface charge variable charge soils |
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