Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(9): 367-376 (2016)


放射性降下物を受けたクリ樹の放射性セシウムの濃度と蓄積量に及ぼす冬季せん定の効果Effects of Winter Pruning on the Concentration and Amount of Radiocaesium in Japanese Chestnut Trees after Radionuclide Deposition

1国立研究開発法人農業・食品産業技術総合研究機構果樹茶業研究部門Institute of Fruit Tree and Tea Science, National Agriculture and Food Research Organization ◇ 305–0852 茨城県つくば市藤本2–1 ◇ 2–1 Fujimoto, Tsukuba-shi, Ibaraki Pref. 305–0852, Japan

四国研究センター(生野地区)Western Region Agricultural Research Center, National Agriculture and Food Research Organization ◇ 765–0053 香川県善通寺市生野町2575 ◇ 2575 Namano, Zentsuzi-shi, Kagawa Pref. 765–0053, Japan

受付日:2016年1月27日Received: January 27, 2016
受理日:2016年5月29日Accepted: May 29, 2016
発行日:2016年9月15日Published: September 15, 2016


We evaluated the effects of pruning on the concentration and total amount of radiocaesium in Japanese chestnut trees (Castanea crenata Sieb. et Zucc. ‘Porotan’) after radionuclide deposition from the nuclear accident at the Fukushima Daiichi Nuclear Power Plant. In March 2013 (2 years after the accident), trees grown in Ibaraki Prefecture were subjected to heavy or conventional pruning, or no pruning as a control. Over the next 2 years, pruning significantly decreased the yield of fruits, but did not significantly affect the concentration of radiocaesium in new organs including fruits. Two years after the treatments, the total amount of radiocaesium in a tree was reduced by 13% by conventional pruning and by 36% by heavy pruning in comparison with that in control. Furthermore, the distribution of radiocaesium in a tree two years after the treatment suggested that, unlike radioactive postasium, radiocaesium in new organs was not derived from the soil through root uptake but was translocated from old branches and trunks which exposed at the time of radionuclide deposition.

Key words: Fukushima Daiichi Nuclear Power Plant accident; radionuclide deposition; radiocaesium; Japanese chestnut; pruning

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