Study of stable cesium for the long-term prognosis of radiocesium cycling in forest ecosystems after Fukushima NPP accident

• Project Area: Interdisciplinary Study on Environmental Transfer of Radionuclides from the Fukushima Daiichi Nuclear Power Plant Accident
• Project/Area Number: 15H00968
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Fukushima University
• Principal Investigator: Yoschenko Vasyl 福島大学, 環境放射能研究所, 特任教授 (40745569)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: stable cesium / Fukushima accident / radiocesium / forest ecosystems / Japanese cedar / radionuclide fluxes / root uptake / forest ecosytems / elements cycling / Fukushima accident, / radiocesium fluxes

Outline of Annual Research Achievements

The quasi-equilibrium between stable and radioactive cesium in the studied Japanese cedar forest has not been reached yet. We predict
- further removal of the residues of the initially intercepted radiocesium from oldest foliage, small branches and outer bark;
- increase of the radiocesium concentrations in young foliage, inner bark and sapwood;
- increase of the radiocesium concentrations and total inventories in heartwood due to its internal translocation from sapwood and inner bark;
- since heartwood is the final depot of cesium isotopes in Japanese cedar, the radiocesium fraction in the tree trunks will not decrease with time; moreover, the total radiocesium fraction in the aboveground biomass may increase with time due to intensification of its root uptake and growth of biomass.

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Radioactive and stable cesium isotope distributions and dynamics in Japanese cedar forests (submitted) (2017)
  • Author(s): V. Yoschenko, T. Takase, T. Hinton, K. Nanba, Y. Onda, A. Konoplev, A. Goto, A. Yokoyama, K. Keitoku
  • Journal Title: Journal of Environmental Radioactivity Volume: -
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Radioactive contaminated forests in Fukushima and Chernobyl (in press) (2017)
  • Author(s): V. Yoschenko, T. Ohkubo, V. Kashparov
  • Journal Title: Journal of Environmental Radioactivity Volume: -
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Radiocesium distribution and fluxes in the typical Cryptomeria japonica forest at the late stage after the accident at Fukushima Dai-Ichi Nuclear Power Plant (2016)
  • Author(s): Yoschenko, V., Takase, T., Konoplev, A., Nanba, K., Onda, Y. Kivva,S. Zheleznyak, M., Sato, N., Keitoku K.
  • Journal Title: Journal of Environmental Radioactivity Volume: 未定 Pages: 45-55
  • DOI: 10.1016/j.jenvrad.2016.02.017
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] he radiocesium dynamics in the Fukushima forests at the late stage after deposition (2017)
  • Author(s): V.Yoschenko, T.Takase, K.Nanba, A.Konoplev, Y.Onda
  • Organizer: European Geoscience Union General Assembly 2017
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2017-04-23
  • Int'l Joint Research
• [Presentation] Radioactive and Stable Cesium Isotopes in Fukushima Forests (2016)
  • Author(s): V.Yoschenko, T.Takase, K.Nanba, Y.Onda, A.Konoplev
  • Organizer: Second International Conference on Radioecological Concentration Processes
  • Place of Presentation: Seville, Spain
  • Year and Date: 2016-11-06
  • Int'l Joint Research
• [Presentation] Radiocesium distributions and dynamics in the Fukushima forest ecosystems (2016)
  • Author(s): V.Yoschenko, A.Konoplev, T.Takase, K.Nanba, Y.Onda, M.Zheleznyak, S.Kivva
  • Organizer: Goldschmidt 2016
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] The dynamics of radiocesium in Fukushima forests (2016)
  • Author(s): V.Yoschenko, T.Takase, A.Konoplev, K.Nanba, Y.Onda
  • Organizer: INSINUME 2017
  • Place of Presentation: Ohrid, Macedonia
  • Year and Date: 2016-04-24
  • Int'l Joint Research
• [Presentation] Study of the radiocesium dynamics in the Fukushima forest ecosystems (2016)
  • Author(s): V.Yoschenko, A.Konoplev, T.Takase, K.Nanba, Y.Onda, M.Zheleznyak, S.Kivva
  • Organizer: European Geoscience Union General Assembly 2016
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2016-04-17
  • Int'l Joint Research
• [Remarks] Activities of the ecosystem group of IER
  • URL: http://www.ier.fukushima-u.ac.jp/web/d_g_ecosystems.html
• [Remarks] Publications of IER
  • URL: http://www.ier.fukushima-u.ac.jp/web/e_publications.html