Variability of K-40 isotopic composition in forest soils under different environmental conditions

概要

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Radiopotassium isotopic composition (K-40/K, %) of several forest soils did not show a constant value of generally known 1.17 x 10(-2) %, but they were varied significantly from 0.4 x 10(-2) to 1.3 x 10(-2) % at different locations under different environmental conditions. Surface portion of a soil (2-4 cm in depth) gave always lower K-40/ K values compared with those of deeper soil layer (35-40 cm in depth). Ion exchange of K+ with NH4+ did not affects the K-40/K value in any soils, which revealed with chemical leaching experiments in the laboratory. Some plant species showed much lower K-40/K values than those in the surface soil. Possible reasons for varying K-40/K values obtained in this study may result from a dynamic behavior of potassium in soil, probably due to biological activity including root uptake and decomposing soil organic matter by microorganisms in the forest floor.
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