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- W1999993976 abstract "We conducted column experiments to evaluate a model designed to simulate solute transport through aggregated soil. We have described this model in Part 1. We took the samples from B horizons of a Brown Lowland Soil (BLS) and a Brown Andosol (ADO), which were characterized respectively by anion exclusion and anion adsorption. We prepared four soil columns 25 cm long and 7.9 cm in diameter, under two physical conditions: fine earth (<2 mm in diameter) and aggregate (about 5 mm). The soils in the top 2.5 cm layer were labeled with D2O and KCl. After 24 mm irrigation, we measured the distribution of D2O, Cl− and K+ throughout the soil columns.The distribution of D2O and Cl− in both fine earth columns of the two soils was symmetrical, each with a convex peak. The distribution of Cl− in BLS expanded downward further than did that of D2O, owing to the anion exclusion effect, while, in ADO, Cl− was moved less quickly than D2O owing to the anion adsorption effect. In both soils most of the added K+ remained in the top layer, owing to the effect of cation exchange adsorption.On the other hand, in the aggregate columns of both soils, the distribution of D2O and Cl− was similar to that of K+. Both D2O and Cl− remained in the top layer owing to the source-sink effect of the aggregates and tailed off downward through the columns. However, the amount of Cl− remaining in the top layer of both soils was much greater than the amount of D2O. Furthermore, BLS, with the anion exclusion effect, apparently adsorbed much more Cl− than did ADO with the anion adsorption effect.Our plate model effectively explained the measured distribution of solutes in both the fine earth and aggregate columns of each soil. We estimated that there was no immobile phase in the fine earth column; that is, there was no interdiffusional transfer between the mobile and immobile phases. On the other hand, we estimated that in the aggregate column interdiffusion occurred during the bypass flow within the mobile phase. Our analysis, however, revealed the same values of the parameters for cation exchange, anion exclusion or anion adsorption effect in both fine earth and aggregate columns. Furthermore, we can explain the much greater retention of Cl− in the aggregate column of BLS by the salt-sieving effect near the surface of the aggregates, coupled with the source-sink effect." @default.
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- W1999993976 date "1991-08-01" @default.
- W1999993976 modified "2023-09-27" @default.
- W1999993976 title "A plate model for solute transport through aggregated soil columns. II. Experimental results and application of the model" @default.
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- W1999993976 doi "https://doi.org/10.1016/0016-7061(91)90024-n" @default.
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