地球化学
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
2022年度日本地球化学会奨励賞受賞記念論文
河川系や森林土壌における炭素や放射性セシウムの動態に関する地球化学的研究
眞中 卓也
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ジャーナル フリー

2024 年 58 巻 1 号 p. 11-22

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To elucidate the role of Himalayan river systems in the global carbon cycle, I have conducted sampling surveys and studied carbonate systems in these rivers. On modern timescales of 1–100 years, I showed that abundant soil-derived CO2 was released from the surface water to the atmosphere. On the geological timescales of more than 10,000 years, I re-evaluated chemical weathering of both silicate and carbonate rocks and the atmospheric CO2 consumed in the basins. I also investigated the dynamics of radiocesium (137Cs) released by the Fukushima Dai-ichi Nuclear Power Plant accident in 2011 and its decadal trends, in Fukushima forest soils. I showed that most of the radiocesium is now retained on the surface of the mineral soil horizon, and that the distributions of radiocesium in each forest compartment (e.g., tree leaves/needles and forest soils) are entering the “quasi-equilibrium steady-state”. In addition, I highlighted the potential importance of organic matter in forest soils as a temporary reservoir of radiocesium and as a source for radiocesium cycling in forest ecosystems.

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