Cesium-137 contamination of oak (Quercus petrae Liebl.) from sub-mediterranean zone in South Bulgaria

Zhiyanski, Miglena; Sokolovska, Maria; Bech, Jaume; Clouvas, A.; Penev, I.; Badulin, Viktor

doi:10.1016/j.jenvrad.2010.05.011

Cited by 27 publications

(14 citation statements)

References 29 publications

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“…These unique behaviour of bark 137 Cs have been reported in Chernobyl studies: The bark of an oak tree species ( Q. petraea ) in Bulgaria was found to be 2–4 times more contaminated with 137 Cs than its leaves and branches 22 years after the Chernobyl accident 16 . In the 40-mm-thick bark of an oak tree species ( Q. robur ) in Romania, the outer 8-mm layer was found to be the most contaminated with 137 Cs 27 years after the accident 17 .…”

Section: Discussionmentioning

confidence: 54%

Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident

Imamura

Komatsu

Ohashi

et al. 2017

Sci Rep

102

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To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the 137Cs concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The 137Cs concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45–1.55 yr for needles and 0.83–1.69 yr for branches. By contrast, the 137Cs concentration in deciduous konara oak leaves did not change over the five years. The concentration of 137Cs in oak wood increased by 37–75%, whereas that in Japanese red pine decreased by 63% over the five years. In Japanese cedar and hinoki cypress, the 137Cs concentration in wood showed an increasing trend in half of the plots. The changes in 137Cs in the organic and mineral soil layers were not strongly related to the tree species or contamination level. Our multi-site, multi-species monitoring results revealed that the pattern of temporal changes in radiocesium in the 9 forest plots was similar overall; however, changes in 137Cs in needles/leaves and wood differed among tree species.

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Section: Discussionmentioning

confidence: 54%

Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident

Imamura

Komatsu

Ohashi

et al. 2017

Sci Rep

102

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“…The fresh leaves collected in May 2011 were highly contaminated (1,790–3,310 Bq kg −1 dw) with Fukushima-derived 137 Cs (Table 2). The leaves were newly emerged ones; such a contamination therefore cannot be explained without invoking mechanisms such as uptake of 137 Cs by roots and translocation of 137 Cs from tree stems62627. The contamination of leaf surfaces by adhering resuspended soil particles may be possible; however, the 137 Cs concentration of fresh leaf samples was not reduced by washing (Table 2), suggesting that this process is of minor importance compared with root uptake28.…”

Section: Discussionmentioning

confidence: 99%

Topographic heterogeneity effect on the accumulation of Fukushima-derived radiocesium on forest floor driven by biologically mediated processes

Koarashi

Atarashi-Andoh

Takeuchi

et al. 2014

Sci Rep

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The accident at the Fukushima Daiichi nuclear power plant caused serious radiocesium (137Cs) contamination of forest ecosystems located in mountainous and hilly regions with steep terrain. To understand topographic effects on the redistribution and accumulation of 137Cs on forest floor, we investigated the distribution of Fukushima-derived 137Cs in forest-floor litter layers on a steep hillslope in a Japanese deciduous forest in August 2013 (29 months after the accident). Both leaf-litter materials and litter-associated 137Cs were accumulated in large amounts at the bottom of the hillslope. At the bottom, a significant fraction (65%) of the 137Cs inventory was observed to be associated with newly shed and less degraded leaf-litter materials, with estimated mean ages of 0.5–1.5 years, added via litterfall after the accident. Newly emerged leaves were contaminated with Fukushima-derived 137Cs in May 2011 (two months after the accident) and 137Cs concentration in them decreased with time. However, the concentrations were still two orders of magnitude higher than the pre-accident level in 2013 and 2014. These observations are the first to show that 137Cs redistribution on a forested hillslope is strongly controlled by biologically mediated processes and continues to supply 137Cs to the bottom via litterfall at a reduced rate.

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“…During the steady phase, radiocesium in the soil that was absorbed into the tree through the roots circulated in the forest ecosystem. Tree contamination following the Chernobyl accident was researched extensively (Tikhomirov and Shcheglov, 1994;Fesenko et al, 2001;Yoshida et al, 2004;Calman et al, 2009;Zhiyanski et al, 2010). Some studies documented 137 Cs distribution among annual rings of the trees at the steady phase (Soukhova et al, 2003;Yoshida et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Changes in the distribution of radiocesium in the wood of Japanese cedar trees from 2011 to 2013

Ogawa

Hirano

Igei

et al. 2016

Journal of Environmental Radioactivity

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Cesium-137 contamination of oak (Quercus petrae Liebl.) from sub-mediterranean zone in South Bulgaria

Cited by 27 publications

References 29 publications

Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident

Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident

Topographic heterogeneity effect on the accumulation of Fukushima-derived radiocesium on forest floor driven by biologically mediated processes

Changes in the distribution of radiocesium in the wood of Japanese cedar trees from 2011 to 2013

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