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タイトル: | Rain-induced bioecological resuspension of radiocaesium in a polluted forest in Japan |
著者: | Kita, Kazuyuki Igarashi, Yasuhito https://orcid.org/0000-0002-6396-788X (unconfirmed) Kinase, Takeshi Hayashi, Naho Ishizuka, Masahide Adachi, Kouji Koitabashi, Motoo Sekiyama, Tsuyoshi Thomas Onda, Yuichi |
著者名の別形: | 北, 和之 五十嵐, 康人 木名瀬, 健 林, 菜穂 石塚, 正秀 足立, 光司 小板橋, 基夫 関山, 剛 恩田, 裕一 |
キーワード: | Biogeochemistry Biomarkers Ecology Environmental sciences Risk factors |
発行日: | 18-Sep-2020 |
出版者: | Springer Nature |
誌名: | Scientific Reports |
巻: | 10 |
論文番号: | 15330 |
抄録: | It is the conventional understanding that rain removes aerosols from the atmosphere. However, the question of whether rain plays a role in releasing aerosols to the atmosphere has recently been posed by several researchers. In the present study, we show additional evidence for rain-induced aerosol emissions in a forest environment: the occurrence of radiocaesium-bearing aerosols in a Japanese forest due to rain. We carried out general radioactive aerosol observations in a typical mountainous village area within the exclusion zone in Fukushima Prefecture to determine the impacts and major drivers of the resuspension of radiocaesium originating from the nuclear accident in March 2011. We also conducted sampling according to the weather (with and without rain conditions) in a forest to clarify the sources of atmospheric radiocaesium in the polluted forest. We found that rain induces an increase in radiocaesium in the air in forests. With further investigations, we confirmed that the fungal spore sources of resuspended radiocaesium seemed to differ between rainy weather and nonrainy weather. Larger fungal particles (possibly macroconidia) are emitted during rainy conditions than during nonrainy weather, suggesting that splash generation by rain droplets is the major mechanism of the suspension of radiocaesium-bearing mould-like fungi. The present findings indicate that radiocaesium could be used as a tracer in such research fields as forest ecology, meteorology, climatology, public health and agriculture, in which fungal spores have significance. |
記述: | 放射性セシウムを含む真菌類の大型胞子の放出が森林環境での雨により増加することを発見 --降水によるバイオエアロゾル大気放出の新証拠--. 京都大学プレスリリース. 2020-10-01. |
著作権等: | © The Author(s) 2020. 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. |
URI: | http://hdl.handle.net/2433/255224 |
DOI(出版社版): | 10.1038/s41598-020-72029-z |
PubMed ID: | 32948784 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2020-10-01 |
出現コレクション: | 学術雑誌掲載論文等 |
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