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Published on: May 27, 2016
Radiation effects in the forest ecosystems: Acute irradiation
S Fesenko1, S Spridonov1, S Geras'kin1
1Russian Institute of Radiology and Agroecology, 249020 109 km, Obninsk, Kaluga region, Russia.
Abstract:
The paper comprehensively brings together key data on radiation effects observed in the Russian studies with an acute forest irradiation. The experiments were based on the ecosystem approach, including an assessment of the radiation impacts based on a variety of the endpoints. The effects at the cellular level were observed at the lowest doses: a double increase of the chromosome aberrations in the apical meristem of pine were found at the site with the absorbed dose of 2.5 Gy. The effects at the tissues levels and trees mortality expressed in D50 were revealed for the trees received 20-50 Gy and a double reduction in a net primary radioactivity was observed at the doses of 14-38 Gy for pine and 280-750 Gy for birch. The seasonal differences in radiosensitivity of the forest ecosystems were noted: the radiosensitivity of the irradiated trees was 3-5 fold higher after the spring irradiation than that after autumn irradiation. An importance of the ecosystem endpoints is emphasized.
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