Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 165, Issue -, Pages 60-67Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2016.09.006
Keywords
Fukushima accident; Radiation; Radiation effects; Japanese red pine; Morphological abnormalities; Cancelling the apical dominance
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Funding
- Fukushima University
- EU FP7 Project COMET (COordination and iMplementation of a panEuropean instrumenT for radioecology) [604974]
- Grants-in-Aid for Scientific Research [15K00563] Funding Source: KAKEN
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Our research, carried out in 2014-2016 at eight sites in the radioactive contaminated territories of Fukushima Prefecture, showed that the young trees of Japanese red pine (Pinus densiflora) are sensitive to radiation. Irradiation induced cancellation of the apical dominance in this species. The effect is similar to that observed in young trees of Scots pine growing in the Chernobyl zone. At the same time, we did not observed any morphological abnormalities in mature trees of Japanese red pine. The probability of cancelling the apical dominance in Japanese red pine increased to 0.11 and 0.14 in the two less irradiated populations, and to 0.5 and 0.9 at sites were the absorbed dose rates were approximately 14 and 25 mu Gy h(-1), respectively. Most of the observed abnormalities appeared in the second whorl after the beginning of exposure. No new abnormalities were observed in the fifth whorl. This temporal pattern is similar to those reported fill. Scots pine in Chernobyl and for Japanese fir in Fukushima. Additional detailed studies are necessary for interpretation of the observed temporal pattern and, in general, for explanation of the mechanism of formation of the morphological abnormalities. (C) 2016 Elsevier Ltd. All rights reserved.
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