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Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident

To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the (137)Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different cont...

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Autores principales: Imamura, Naohiro, Komatsu, Masabumi, Ohashi, Shinta, Hashimoto, Shoji, Kajimoto, Takuya, Kaneko, Shinji, Takano, Tsutomu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5557944/
https://www.ncbi.nlm.nih.gov/pubmed/28811510
http://dx.doi.org/10.1038/s41598-017-08261-x
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author Imamura, Naohiro
Komatsu, Masabumi
Ohashi, Shinta
Hashimoto, Shoji
Kajimoto, Takuya
Kaneko, Shinji
Takano, Tsutomu
author_facet Imamura, Naohiro
Komatsu, Masabumi
Ohashi, Shinta
Hashimoto, Shoji
Kajimoto, Takuya
Kaneko, Shinji
Takano, Tsutomu
author_sort Imamura, Naohiro
collection PubMed
description To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the (137)Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The (137)Cs concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45–1.55 yr for needles and 0.83–1.69 yr for branches. By contrast, the (137)Cs concentration in deciduous konara oak leaves did not change over the five years. The concentration of (137)Cs in oak wood increased by 37–75%, whereas that in Japanese red pine decreased by 63% over the five years. In Japanese cedar and hinoki cypress, the (137)Cs concentration in wood showed an increasing trend in half of the plots. The changes in (137)Cs in the organic and mineral soil layers were not strongly related to the tree species or contamination level. Our multi-site, multi-species monitoring results revealed that the pattern of temporal changes in radiocesium in the 9 forest plots was similar overall; however, changes in (137)Cs in needles/leaves and wood differed among tree species.
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spelling pubmed-55579442017-08-16 Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident Imamura, Naohiro Komatsu, Masabumi Ohashi, Shinta Hashimoto, Shoji Kajimoto, Takuya Kaneko, Shinji Takano, Tsutomu Sci Rep Article To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the (137)Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The (137)Cs concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45–1.55 yr for needles and 0.83–1.69 yr for branches. By contrast, the (137)Cs concentration in deciduous konara oak leaves did not change over the five years. The concentration of (137)Cs in oak wood increased by 37–75%, whereas that in Japanese red pine decreased by 63% over the five years. In Japanese cedar and hinoki cypress, the (137)Cs concentration in wood showed an increasing trend in half of the plots. The changes in (137)Cs in the organic and mineral soil layers were not strongly related to the tree species or contamination level. Our multi-site, multi-species monitoring results revealed that the pattern of temporal changes in radiocesium in the 9 forest plots was similar overall; however, changes in (137)Cs in needles/leaves and wood differed among tree species. Nature Publishing Group UK 2017-08-15 /pmc/articles/PMC5557944/ /pubmed/28811510 http://dx.doi.org/10.1038/s41598-017-08261-x Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Imamura, Naohiro
Komatsu, Masabumi
Ohashi, Shinta
Hashimoto, Shoji
Kajimoto, Takuya
Kaneko, Shinji
Takano, Tsutomu
Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title_full Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title_fullStr Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title_full_unstemmed Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title_short Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident
title_sort temporal changes in the radiocesium distribution in forests over the five years after the fukushima daiichi nuclear power plant accident
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5557944/
https://www.ncbi.nlm.nih.gov/pubmed/28811510
http://dx.doi.org/10.1038/s41598-017-08261-x
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