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

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Abstract

Radiopotassium isotopic composition (40K/K, %) of several forest soils did not show a constant value of generally known 1.17 × 10−2 %, but they were varied significantly from 0.4 × 10−2 to 1.3 × 10−2 % at different locations under different environmental conditions. Surface portion of a soil (2–4 cm in depth) gave always lower 40K/K values compared with those of deeper soil layer (35–40 cm in depth). Ion exchange of K+ with NH4 + did not affects the 40K/K value in any soils, which revealed with chemical leaching experiments in the laboratory. Some plant species showed much lower 40K/K values than those in the surface soil. Possible reasons for varying 40K/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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Acknowledgments

We would greatly thank Prof. Janja Vaupotič and Prof. Emeritus Ivan Kobal of Jozef Stefan Institute in Slovenia for helping field works in the forest sites in Slovenia and giving valuable background information on the geology, climate and topology etc. The authors would also appreciate Prof. Hiura and Dr. Nakaji at Tomakomai Research Station, Field Science Center for Northern Biosphere, Hokkaido University for supporting their research work in Tomakomai Experimental Forest.

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Authors and Affiliations

  1. Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Ryoko Fujiyoshi, Naoki Takekoshi & Kazumasa Okamoto

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  1. Ryoko Fujiyoshi
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  2. Naoki Takekoshi
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  3. Kazumasa Okamoto
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Correspondence to Ryoko Fujiyoshi.

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Fujiyoshi, R., Takekoshi, N. & Okamoto, K. Variability of 40K isotopic composition in forest soils under different environmental conditions. J Radioanal Nucl Chem 299, 1365–1371 (2014). https://doi.org/10.1007/s10967-013-2797-z

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  • DOI: https://doi.org/10.1007/s10967-013-2797-z

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