Radiocesium migration in the litter layer of different forest types in Fukushima, Japan

Kurihara, Momo; Onda, Yuichi; Kato, Hiroaki; Loffredo, Nicolas; Yasutaka, Tetsuo; Coppin, Frédéric

doi:10.1016/j.jenvrad.2018.01.027

Cited by 22 publications

(20 citation statements)

References 32 publications

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“…Therefore, explanatory variables selected for the MLR model were tresDM, humus Corg concentrations, soil and litter I concentrations. Multiple regression analysis showed that humus iodine concentrations were highly positively correlated with those in soil (Table 1; p < 0 .001), suggesting that humus degradation could be a source of I for soil and/ or that iodine concentrations in humus could partly result from upward transport by organisms from iodine-enriched mineral soil horizons (Fukuyama and Takenaka, 2004;Giesler et al, 2000;Kurihara et al, 2018). The dataset did not allow us to identify which of these processes were the most important.…”

Section: Humus: Interface Compartment Between Total I Input To Soil Amentioning

confidence: 99%

Iodine budget in forest soils: Influence of environmental conditions and soil physicochemical properties

et al. 2019

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Section: Humus: Interface Compartment Between Total I Input To Soil Amentioning

confidence: 99%

Iodine budget in forest soils: Influence of environmental conditions and soil physicochemical properties

et al. 2019

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“…For example, Koarashi et al (2016) reported that approximately 80% of the deposited 137Cs in deciduous broad-leaved forest migrated to minerals located below the organic layer, whereas more than half of the deposited 137Cs remained in the organic layer of the coniferous forest. Kurihara et al (2018) also observed faster 137Cs output flux from decomposing broadleaf forest litter than from the cedar forest litter. These collectively confirm that the litter type does affect the 137Cs dynamics in soil.…”

Section: Soils Contaminated By Solid 137cs Inputsmentioning

confidence: 76%

“…Statistically, the acetate-extractable 137Cs fraction in BL-OL treatment was significantly different from the BL-OF (P = 0.00017), CED-OL (P=0.0000039) and CED-OF (P=0.0000036) treatments, highlighting that the acetate-extractable 137Cs fraction from the contaminated litter tends to depend on the litter types and its degradation status. In connection to this, several studies from laboratory and field conditions have revealed that the leaching and migration of 137Cs in deciduous forest floors are greater than from coniferous floors (e.g., Hashida and Yoshihara, 2016;Koarashi et al, 2016;Kurihara et al, 2018;Nakanishi et al, 2014). For example, Koarashi et al (2016) reported that approximately 80% of the deposited 137Cs in deciduous broad-leaved forest migrated to minerals located below the organic layer, whereas more than half of the deposited 137Cs remained in the organic layer of the coniferous forest.…”

Section: Soils Contaminated By Solid 137cs Inputsmentioning

confidence: 99%

Impact of drying and wetting cycles on 137Cs ageing in forest soils contaminated with different input forms

Teramage

Carasco

Coppin

2019

Journal of Environmental Radioactivity

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Water and acetate extractable radiocesium (137Cs) concentrations were monitored for >400 days in soils that were amended with aqueous 137Cs or solid organic sources of 137Cs (plant litter or fragmented organic materials) and subjected to a series of wet-dry cycles. The soils were collected from broadleaf and cedar forests in Fukushima, Japan. In soils amended with aqueous 137Cs, the water extractable 137Cs fraction was very low (<1%) and decreased over time while it was below the detection limit in soils amended with solid organic sources of 137Cs. The acetate extractable 137Cs in soil amended with aqueous 137Cs also exhibited an exponential decrease over time (~55% to 30%) but, remained higher than in soils amended by solid organic sources of 137Cs which remained stable (ranging from 2% to 15%). These results collectively indicate that: (1) drying and wetting cycles have little impact on 137Cs availability, possibly due to the relatively short observation period; (2) 137Cs ageing (increased binding to soil) was apparent only when 137Cs was applied in the aqueous form; and (3) both the water and acetate-extractable 137Cs fractions were greater for aqueous amended than for solid organic amended soils. More acetate extractable 137Cs was observed in soils contaminated with broadleaf materials compared to their cedar counterparts, which may be linked to the nature of the organic material itself. For natural conditions, such kind of information is useful to improve our understanding of the evolution of 137Cs availability with time from different contamination sources.

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“…Before the evacuation order was lifted a series of environmental studies were conducted in the Yamakiya district mainly on the measurement and behaviour of 137 Cs in water (Tsuji et al, 2014), soil and forests (Takada et al, 2016;Kurihara et al, 2018aKurihara et al, , 2018b.…”

Section: The Approach Before the Evacuation Order Was Liftedmentioning

confidence: 99%

Dialogue, radiation measurements and other collaborative practices by experts and residents in the former evacuation areas of Fukushima: A case study in Yamakiya District, Kawamata Town

et al. 2020

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This paper describes the involvement of the residents of the Yamakiya district of the Kawamata town, a former evacuation area after the accident of Fukushima Daiichi Nuclear Power Plant (FDNPP), in the on-going research activities of the authors on the behaviour of radioactive caesium in the environment. By relying on dialogue, measuring radiation, and other collaborative practices, this involvement enabled a series of actions to be taken to resolve the challenges related to the recovery after the lifting of the evacuation order that were appreciated by the residents. The paper also discusses the effects of the interactive program led by the Yamakiya School organized by the authors in cooperation with the residents including among others lectures, voluntary works and radiological surveys on local issues. Based on the above, the authors make recommendations on the desirable form of relationship between residents and experts after an event of large-scale environmental pollution including radiological contamination. Through these activities the authors have also gradually changed their research approach.

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Radiocesium migration in the litter layer of different forest types in Fukushima, Japan

Cited by 22 publications

References 32 publications

Iodine budget in forest soils: Influence of environmental conditions and soil physicochemical properties

Iodine budget in forest soils: Influence of environmental conditions and soil physicochemical properties

Impact of drying and wetting cycles on 137Cs ageing in forest soils contaminated with different input forms

Dialogue, radiation measurements and other collaborative practices by experts and residents in the former evacuation areas of Fukushima: A case study in Yamakiya District, Kawamata Town

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