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Ota M, Nagai H, Koarashi J. Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions. Sci Total Environ. 2016;551:590-604doi: 10.1016/j.scitotenv.2016.02.068.
Ota, M., Nagai, H., & Koarashi, J. (2016). Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions. The Science of the total environment, 551590-604. https://doi.org/10.1016/j.scitotenv.2016.02.068
Ota, Masakazu, et al. "Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions." The Science of the total environment vol. 551 (2016): 590-604. doi: https://doi.org/10.1016/j.scitotenv.2016.02.068
Ota M, Nagai H, Koarashi J. Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions. Sci Total Environ. 2016 May 01;551:590-604. doi: 10.1016/j.scitotenv.2016.02.068. Epub 2016 Feb 18. PMID: 26897402.
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Sci Total Environ. 2016 May 01;551:590-604. doi: 10.1016/j.scitotenv.2016.02.068. Epub 2016 Feb 18.

Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions.

The Science of the total environment

Masakazu Ota, Haruyasu Nagai, Jun Koarashi

Affiliations

  1. Research Group for Environmental Science, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan. Electronic address: [email protected].
  2. Research Group for Environmental Science, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.

PMID: 26897402 DOI: 10.1016/j.scitotenv.2016.02.068

Abstract

A process-based model for (137)Cs transfer in forest surface environments was developed to assess the dynamic behavior of Fukushima-derived (137)Cs in a Japanese forest. The model simulation successfully reproduced the observed data from 3year migration of (137)Cs in the organic and mineral soil layers at a contaminated forest near Fukushima. The migration of (137)Cs from the organic layer to the mineral soil was explained by the direct deposition pattern on the forest floor and the turnover of litter materials in the organic layer under certain ecological conditions. Long-term predictions indicated that more than 90% of the deposited (137)Cs would remain within the top 5cm of the soil for up to 30years after the accident, suggesting that the forest acts as an effective long-term reservoir of (137)Cs with limited transfer via the groundwater pathway. The model was also used to explore the potential impacts of soil organic matter (SOM) interactions on the mobility and bioavailability of (137)Cs in the soil-plant system. The simulation results for hypothetical organic soils with modified parameters of (137)Cs turnover revealed that the SOM-induced reduction of (137)Cs adsorption elevates the fraction of dissolved (137)Cs in the soil solution, thereby increasing the soil-to-plant transfer of (137)Cs without substantially altering the fractional distribution of (137)Cs in the soil. Slower fixation of (137)Cs on the flayed edge site of clay minerals and enhanced mobilization of the clay-fixed (137)Cs in organic-rich soils also appeared to elevate the soil-to-plant transfer of (137)Cs by increasing the fraction of the soil-adsorbed (exchangeable) (137)Cs. A substantial proportion (approximate 30%-60%) of (137)Cs in these organic-rich soils was transferred to layers deeper than 5cm decades later. These results suggested that SOM influences the behavior of (137)Cs in forests over a prolonged period through alterations of adsorption and fixation in the soil.

Copyright © 2016 Elsevier B.V. All rights reserved.

Keywords: Cesium; Clay; Fukushima Daiichi Nuclear Power Plant accident; Mineral soil; Organic layer

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