Temporal changes of radiocesium in irrigated paddy fields and its accumulation in rice plants in Fukushima

文献类型: 外文期刊

第一作者: Yang, Baolu

作者: Yang, Baolu;Ha, Yiming;Yang, Baolu;Onda, Yuichi;Wakiyama, Yoshifumi;Yoshimura, Kazuya;Sekimoto, Hitoshi

作者机构:

关键词: Radiocesium;Soil;Irrigation water;Rice;Concentration ratio

期刊名称:ENVIRONMENTAL POLLUTION ( 影响因子:8.071; 五年影响因子:8.35 )

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收录情况: SCI

摘要: About half of the total paddy field area, which is the dominant agricultural land in Fukushima Prefecture, was contaminated by radiocesium released by the Fukushima Daiichi Nuclear Power Plant accident. In this study, we investigated the temporal changes of radiocesium in soil, irrigation water, and rice plant in two adjacent rice paddies, with and without surface-soil-removal, in Fukushima Prefecture for over three years (2012-2014) after the nuclear accident. Our results showed that radiocesium migrated into 24 28 cm soil layers and that the activity concentration of radiocesium in paddy soils showed a significant reduction in 2014. The newly added radiocesium to paddies through irrigation water contributed only a maximum value of 0.15% and 0.75% of the total amount present in control and decontaminated paddies, respectively, throughout the study period. The radiocesium activity concentration in suspended sediment in irrigation water exponentially decreased, and the effective half-lives (T-eff) for Cs-137 and Cs-134 were 1.3 and 0.9 years, respectively. Additionally, the average suspended sediment concentration in irrigation water increased between 2012 and 2014, suggesting that enhanced soil erosion had occurred in the surrounding environment. Radiocesium accumulation in rice plant also decreased with time in both paddies. However, the concentration ratio of radiocesium for rice plant in the decontaminated paddy increased compared with control paddy, despite approximately 96% of fallout radiocesium removed in paddy soil. Further analysis is required to clarify the reasons of high concentration ratio of radiocesium for rice plant in the decontaminated paddy. (C) 2015 Elsevier Ltd. All rights reserved.

分类号: X5

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