Radiocesium mobility in different parts of the two major tree species in Fukushima
Abstract Radiocesium (137Cs) released in the Fukushima Dai-ichi Nuclear Power Plant accident is still cycling in the forest ecosystem. We examined the mobility of 137Cs in the external parts—leaves/needles, branches, and bark—of the two major tree species in Fukushima, Japanese cedar (Cryptomeria ja...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-35852-8 |
| _version_ | 1797806751777554432 |
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| author | Takuya Manaka Masatake G. Araki Shinta Ohashi Naohiro Imamura Wataru Sakashita Sumika Ogo Masabumi Komatsu Tadashi Sakata Yoshiki Shinomiya |
| author_facet | Takuya Manaka Masatake G. Araki Shinta Ohashi Naohiro Imamura Wataru Sakashita Sumika Ogo Masabumi Komatsu Tadashi Sakata Yoshiki Shinomiya |
| author_sort | Takuya Manaka |
| collection | DOAJ |
| description | Abstract Radiocesium (137Cs) released in the Fukushima Dai-ichi Nuclear Power Plant accident is still cycling in the forest ecosystem. We examined the mobility of 137Cs in the external parts—leaves/needles, branches, and bark—of the two major tree species in Fukushima, Japanese cedar (Cryptomeria japonica) and konara oak (Quercus serrata). This variable mobility will likely lead to spatial heterogeneity of 137Cs and difficulty in predicting its dynamics for decades. We conducted leaching experiments on these samples by using ultrapure water and ammonium acetate. In Japanese cedar, the 137Cs percentage leached from current-year needles was 26–45% (ultrapure water) and 27–60% (ammonium acetate)—similar to those from old needles and branches. In konara oak, the 137Cs percentage leached from leaves was 47–72% (ultrapure water) and 70–100% (ammonium acetate)—comparable to those from current-year and old branches. Relatively poor 137Cs mobility was observed in the outer bark of Japanese cedar and in organic layer samples from both species. Comparison of the results from corresponding parts revealed greater 137Cs mobility in konara oak than in Japanese cedar. We suggest that more active cycling of 137Cs occurs in konara oak. |
| first_indexed | 2024-03-13T06:12:03Z |
| format | Article |
| id | doaj.art-03542ad05d774d3fa96282ed9181ddf7 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-13T06:12:03Z |
| publishDate | 2023-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-03542ad05d774d3fa96282ed9181ddf72023-06-11T11:11:09ZengNature PortfolioScientific Reports2045-23222023-06-0113111310.1038/s41598-023-35852-8Radiocesium mobility in different parts of the two major tree species in FukushimaTakuya Manaka0Masatake G. Araki1Shinta Ohashi2Naohiro Imamura3Wataru Sakashita4Sumika Ogo5Masabumi Komatsu6Tadashi Sakata7Yoshiki Shinomiya8Department of Forest Soils, Forestry and Forest Products Research Institute (FFPRI)Extension and Protection Division, Private Forest Department, Forestry AgencyDepartment of Wood Properties and Processing, FFPRIHokkaido Research Center, FFPRIDepartment of Forest Soils, Forestry and Forest Products Research Institute (FFPRI)Department of Mushroom Science and Forest Microbiology, FFPRICenter for Forest Restoration and Radioecology, FFPRIDepartment of Forest Soils, Forestry and Forest Products Research Institute (FFPRI)Center for Forest Restoration and Radioecology, FFPRIAbstract Radiocesium (137Cs) released in the Fukushima Dai-ichi Nuclear Power Plant accident is still cycling in the forest ecosystem. We examined the mobility of 137Cs in the external parts—leaves/needles, branches, and bark—of the two major tree species in Fukushima, Japanese cedar (Cryptomeria japonica) and konara oak (Quercus serrata). This variable mobility will likely lead to spatial heterogeneity of 137Cs and difficulty in predicting its dynamics for decades. We conducted leaching experiments on these samples by using ultrapure water and ammonium acetate. In Japanese cedar, the 137Cs percentage leached from current-year needles was 26–45% (ultrapure water) and 27–60% (ammonium acetate)—similar to those from old needles and branches. In konara oak, the 137Cs percentage leached from leaves was 47–72% (ultrapure water) and 70–100% (ammonium acetate)—comparable to those from current-year and old branches. Relatively poor 137Cs mobility was observed in the outer bark of Japanese cedar and in organic layer samples from both species. Comparison of the results from corresponding parts revealed greater 137Cs mobility in konara oak than in Japanese cedar. We suggest that more active cycling of 137Cs occurs in konara oak.https://doi.org/10.1038/s41598-023-35852-8 |
| spellingShingle | Takuya Manaka Masatake G. Araki Shinta Ohashi Naohiro Imamura Wataru Sakashita Sumika Ogo Masabumi Komatsu Tadashi Sakata Yoshiki Shinomiya Radiocesium mobility in different parts of the two major tree species in Fukushima Scientific Reports |
| title | Radiocesium mobility in different parts of the two major tree species in Fukushima |
| title_full | Radiocesium mobility in different parts of the two major tree species in Fukushima |
| title_fullStr | Radiocesium mobility in different parts of the two major tree species in Fukushima |
| title_full_unstemmed | Radiocesium mobility in different parts of the two major tree species in Fukushima |
| title_short | Radiocesium mobility in different parts of the two major tree species in Fukushima |
| title_sort | radiocesium mobility in different parts of the two major tree species in fukushima |
| url | https://doi.org/10.1038/s41598-023-35852-8 |
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