休眠期に放射性セシウム汚染されたモモ[<i>Prunus persica</i>(L.)Batsch]およびカキ(<i>Diospyros kaki</i> Thunb.)における高圧洗浄機を用いた樹皮除染の効果 Decontamination Effects of Bark Washing with a High-pressure Washer on Peach [<i>Prunus persica</i> (L.) Batsch] and Japanese Persimmon (<i>Diospyros kaki</i> Thunb.) Contaminated with Radiocaesium during Dormancy

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Abstract

モモ[<i>Prunus persica</i>(L.)Batsch]とカキ(<i>Diospyros kaki</i> Thunb.)を供試し,福島第一原子力発電所事故の放射性降下物により休眠期汚染された落葉果樹に対する高圧洗浄機を用いた樹皮洗浄による放射性セシウムの除染効果を検証した.夏季洗浄処理として 18 年生モモ'あかつき'を供試し,2011 年 7 月 5 日と 27 日の 2 回にわたり,樹皮洗浄処理を実施した.休眠期洗浄処理として 2011 年 12 月 21 日に 30 年生カキ'蜂屋',2012 年 1 月 24 日に 7 年生モモ'川中島白桃'を供試し,樹皮洗浄処理を加えた.高圧洗浄処理によりカキではほぼ全ての粗皮がはく離したが,モモの表皮はほとんどはく離しなかった.2011 年夏季に洗浄処理されたモモ'あかつき'の果実中 <sup>137</sup>Cs 濃度は洗浄による有意差は認められなかった.2011 年から 2012 年の冬季に洗浄処理されたモモ'川中島白桃'の葉および果実中 <sup>137</sup>Cs 濃度は洗浄により有意に減少した.同様にカキ'蜂屋'でも洗浄処理翌年の葉および果実中 <sup>137</sup>Cs 濃度は洗浄により有意に減少した.これらの対照的な結果と矛盾しない現象として,汚染された樹皮洗浄液による二次汚染および樹皮からの追加的汚染の可能性について考察を加えた.

The effect of bark washing with a high-pressure washer on deciduous trees contaminated during dormancy by radiocaesium fallout derived from the Fukushima Daiichi Nuclear Power Plant accident was examined using peach [<i>Prunus persica</i> (L.) Batsch] and Japanese persimmon (<i>Diospyros kaki</i> Thunb.). Eighteen-year-old peach trees ('Akatsuki') were bark-washed twice with a high-pressure washer on July 5 and 27, 2011. Seven-year-old peach trees ('Kawanakajima Hakuto') were bark-washed on January 24, 2012, and thirty-year-old Japanese persimmon trees ('Hachiya') were bark-washed on December 21, 2011. For the peach trees, most of the bark was not removed by washing with a high-pressure washer. In contrast, the rough bark of Japanese persimmon was removed completely. No significant differences in the <sup>137</sup>Cs concentration of 'Akatsuki' fruit were found between the treatments conducted in the summer of 2011. Upon the bark washing of peach 'Akatsuki' trees in summer, the possibility of secondary contamination of leaves via the leachate containing <sup>137</sup>Cs was likely. The <sup>137</sup>Cs concentrations in fruits and leaves of peach 'Kawanakajima Hakuto' collected in summer 2012 were decreased significantly by washing treatment conducted in winter 2011–2012. In the year after treatment, the <sup>137</sup>Cs concentrations in fruits and leaves of Japanese persimmon were significantly decreased by the treatment. The effect of the bark washing on decreasing <sup>137</sup>Cs contents in fruits and leaves was greater in Japanese persimmon than in peach. The results for 'Kawanakajima Hakuto' and 'Hachiya' demonstrated the possibility of additive contamination.

Journal

  • The Horticulture Journal

    The Horticulture Journal 84(4), 295-304, 2015

    The Japanese Society for Horticultural Science

Codes

  • NII Article ID (NAID)
    130005105345
  • NII NACSIS-CAT ID (NCID)
    AA12708073
  • Text Lang
    ENG
  • ISSN
    2189-0102
  • NDL Article ID
    026813051
  • NDL Call No.
    Z78-A456
  • Data Source
    NDL  J-STAGE 
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