Soil removal as a decontamination practice and radiocesium accumulation in tadpoles in rice paddies at Fukushima

Sakai, Masaru; Gomi, Takashi; Nunokawa, Masanori; Wakahara, Taeko; Onda, Yuichi

doi:10.1016/j.envpol.2014.01.002

Cited by 46 publications

(36 citation statements)

References 17 publications

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“…Furthermore, it indicates that the post-contamination migration of Cs seems to be slow or limited due to the adsorption of the fallout radionuclide by the surface soil. This finding is in agreement with many other studies where radiocesium was shown to be mostly retained on the soil surface in contaminated areas in Fukushima (Endo et al 2012(Endo et al , 2013Ohno et al 2012;Sakai et al 2014).…”

Section: Resultssupporting

confidence: 95%

Evaluation of the possibility to use the plant–microbe interaction to stimulate radioactive 137Cs accumulation by plants in a contaminated farm field in Fukushima, Japan

et al. 2014

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Field experiments in a contaminated farmland in Nihonmatsu city, Fukushima were conducted to assess the effectiveness of the plant-microbe interaction on removal of radiocesium. Before plowing, 93.3% of radiocesium was found in the top 5 cm layer (5,718 Bq kg DW(-1)). After plowing, Cs radioactivity in the 0-15 cm layer ranged from 2,037 to 3,277 Bq kg DW(-1). Based on sequential extraction, the percentage of available radiocesium (water soluble + exchangeable) was fewer than 10% of the total radioactive Cs. The transfer of (137)Cs was investigated in three agricultural crops; komatsuna (four cultivars), Indian mustard and buckwheat, inoculated with a Bacillus or an Azospirillum strains. Except for komatsuna Nikko and Indian mustard, inoculation with both strains resulted in an increase of biomass production by the tested plants. The highest (137)Cs radioactivity concentration in above-ground parts was found in Bacillus-inoculated komatsuna Nikko (121 Bq kg DW(-1)), accompanied with the highest (137)Cs TF (0.092). Furthermore, komatsuna Nikko-Bacillus and Indian mustard-Azospirillum associations gave the highest (137)Cs removal, 131.5 and 113.8 Bq m(-2), respectively. Despite the beneficial effect of inoculation, concentrations of (137)Cs and its transfer to the tested plants were not very high; consequently, removal of (137)Cs from soil would be very slow.

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Section: Resultssupporting

confidence: 95%

Evaluation of the possibility to use the plant–microbe interaction to stimulate radioactive 137Cs accumulation by plants in a contaminated farm field in Fukushima, Japan

et al. 2014

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“…On the other hand, some tadpoles feed on sediment detritus, which is likely to be highly polluted (Fukushima and Arai, 2014;Yoshimura and Akama, 2014). In fact, Sakai et al (2014) reported that local differences in radiocesium concentrations in rice paddy sediments could influence the accumulation of radiocesium in Pelophylax porosa porosa tadpoles. Therefore, upon metamorphosis, larvae of amphibians (i.e., frogs and salamanders) might transfer radiocesium from aquatic to terrestrial ecosystems.…”

Section: Discussionmentioning

confidence: 97%

“…Therefore, examination of radiocesium accumulation in amphibians can facilitate understanding of the circulation of this contaminant in forest ecosystems, including terrestrial and aquatic environments (Stark et al, 2004). To date, few studies have investigated radiocesium accumulation in amphibians after the FNPP accident (but see Sakai et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Ayabe et al (2014) reported that radiocesium concentrations in a forest floor-inhabiting web spider (Nephila clavata) increased according to radiation dose rate, which depended on distance from the FNPP at 1.5 years after the FNPP accident. Previous studies of aquatic habitats have mostly surveyed freshwater fish species (e.g., Iguchi et al, 2013;Fukushima and Arai, 2014;Yamamoto et al, 2014), although several other taxa have been examined (aquatic insects, Yoshimura and Akama, 2014; anuran tadpoles, Sakai et al, 2014). To clarify the overall flow and distribution of radiocesium in a forest ecosystem, animals that connect the terrestrial and aquatic food webs must be carefully monitored (Murakami et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Radiocesium accumulation in the anuran frog, Rana tagoi tagoi, in forest ecosystems after the Fukushima Nuclear Power Plant accident

Takahara

Endo

Takada

et al. 2015

Environmental Pollution

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“…Japanese authorities have conducted an extensive decontamination program targeting mainly rural residential and cultivated landscapes, including paddy fields (Sakai et al, 2014;Yasutaka and Naito, 2016). Among other activities, decontamination removes vegetation and replaces topsoil (~5 cm).…”

Section: Introductionmentioning

confidence: 99%

Do forests represent a long-term source of contaminated particulate matter in the Fukushima Prefecture?

Laceby

Huon

Onda

et al. 2016

Journal of Environmental Management

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a b s t r a c tThe Fukushima Daiichi Nuclear Power Plant (FDNPP) accident resulted in radiocesium fallout contaminating coastal catchments of the Fukushima Prefecture. As the decontamination effort progresses, the potential downstream migration of radiocesium contaminated particulate matter from forests, which cover over 65% of the most contaminated region, requires investigation. Carbon and nitrogen elemental concentrations and stable isotope ratios are thus used to model the relative contributions of forest, cultivated and subsoil sources to deposited particulate matter in three contaminated coastal catchments. Samples were taken from the main identified sources: cultivated (n ¼ 28), forest (n ¼ 46), and subsoils (n ¼ 25). Deposited particulate matter (n ¼ 82) was sampled during four fieldwork campaigns from November 2012 to November 2014. A distribution modelling approach quantified relative source contributions with multiple combinations of element parameters (carbon only, nitrogen only, and four parameters) for two particle size fractions (<63 mm and <2 mm). Although there was significant particle size enrichment for the particulate matter parameters, these differences only resulted in a 6% (SD 3%) mean difference in relative source contributions. Further, the three different modelling approaches only resulted in a 4% (SD 3%) difference between relative source contributions. For each particulate matter sample, six models (i.e. <63 mm and <2 mm from the three modelling approaches) were used to incorporate a broader definition of potential uncertainty into model results. Forest sources were modelled to contribute 17% (SD 10%) of particulate matter indicating they present a long term potential source of radiocesium contaminated material in fallout impacted catchments. Subsoils contributed 45% (SD 26%) of particulate matter and cultivated sources contributed 38% (SD 19%). The reservoir of radiocesium in forested landscapes in the Fukushima region represents a potential long-term source of particulate contaminated matter that will require diligent management for the foreseeable future.

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Soil removal as a decontamination practice and radiocesium accumulation in tadpoles in rice paddies at Fukushima

Cited by 46 publications

References 17 publications

Evaluation of the possibility to use the plant–microbe interaction to stimulate radioactive 137Cs accumulation by plants in a contaminated farm field in Fukushima, Japan

Evaluation of the possibility to use the plant–microbe interaction to stimulate radioactive 137Cs accumulation by plants in a contaminated farm field in Fukushima, Japan

Radiocesium accumulation in the anuran frog, Rana tagoi tagoi, in forest ecosystems after the Fukushima Nuclear Power Plant accident

Do forests represent a long-term source of contaminated particulate matter in the Fukushima Prefecture?

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