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

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Title: Variability of K-40 isotopic composition in forest soils under different environmental conditions
Authors: Fujiyoshi, Ryoko Browse this author →KAKEN DB
Takekoshi, Naoki Browse this author
Okamoto, Kazumasa Browse this author
Keywords: K-40 isotopic composition
Depth distribution
Carbonaceous soil
Volcanic soil
Soil organic matter
Issue Date: Mar-2014
Publisher: Springer
Journal Title: Journal of Radioanalytical and Nuclear Chemistry
Volume: 299
Issue: 3
Start Page: 1365
End Page: 1371
Publisher DOI: 10.1007/s10967-013-2797-z
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/56346
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤吉 亮子

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