Long-term radiocesium behaviour in spruce and oak forests

Sombre, L.; Vanhouche, M.; DEBROUWER, S; Ronneau, Claude; LAMBOTTE, J; MYTTENAERE, C

doi:10.1016/0048-9697(94)04267-q

Cited by 7 publications

(10 citation statements)

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“…As previously mentioned, sampling in 2011 was performed in early August, whereas sampling in 2012 and 2013 was performed in late May to early June. Seasonal variations may occur in the concentrations of many elements, including cesium, in the folige of trees, particularly in deciduous species (Wyttenbach and Tobler, 1988;Sombr e et al, 1994;Yoshihara et al, 2014a). Another possible explanation is a combination of three factors: the expanding time of the observed foliar parts, weathering effects, and Cs translocation ability.…”

Section: Resultsmentioning

confidence: 96%

“…These ecological traits probably also influence the various vertical distributions of radiocesium among species and years. Furthermore, the internal transfer of Cs and potassium (K) is similar in trees; these elements are highly mobile, making internal translocation to newly emerging tissues/sinks particularly important (Ronneau et al, 1991;Sombr e et al, 1994;Kaunisto et al, 2002;Yoshihara et al, 2014a). Co-transport with K could be tree species-and element-specific (Smith and Shortle, 1996).…”

Section: Vertical Distributions Of Radiocesium In the Canopymentioning

confidence: 99%

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Changes in radiocesium contamination from Fukushima in foliar parts of 10 common tree species in Japan between 2011 and 2013

Yoshihara

Matsumura

Tsuzaki

et al. 2014

Journal of Environmental Radioactivity

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Yearly changes in radiocesium ((137)Cs) contamination, primarily due to the Fukushima accident of March 2011, were observed in the foliar parts of 10 common woody species in Japan (Chamaecyparis obtusa, Cedrus deodara, Pinus densiflora, Cryptomeria japonica, Phyllostachys pubescens, Cinnamomum camphora, Metasequoia glyptostroboides, Prunus × yedoensis, Acer buergerianum, and Aesculus hippocastanum). The samples were obtained from Abiko (approximately 200 km SSW of the Fukushima Dai-ichi Nuclear Power Plant) during each growing season between 2011 and 2013, and the foliar parts were examined based on their year of expansion and location in each trees. The radiocesium concentrations generally decreased with time; however, the concentrations and rates of decrease varied among species, age of foliar parts, and locations. The radiocesium concentrations in the 2012 current-year foliar parts were 29%-220% of those from 2011, while those from 2013 fell to between 14% and 42% of the 2011 values. The net decontamination in the foliage was higher in evergreen species than in deciduous species. The radiocesium concentrations in the upper foliar parts were higher than those in the lower parts particularly in C. japonica. In addition, the radiocesium concentrations were higher in the current-year foliar parts than in the 1-year-old foliar parts, particularly in 2013. Thus, the influence of the direct deposition of the fallout was reduced with time, and the translocation ability of radiocesium from old to new tissues became more influential. Similar to the behavior of potassium in trees, Cs redistribution probably occurred primarily due to internal nutrient translocation mechanisms.

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Section: Resultsmentioning

confidence: 96%

Section: Vertical Distributions Of Radiocesium In the Canopymentioning

confidence: 99%

Changes in radiocesium contamination from Fukushima in foliar parts of 10 common tree species in Japan between 2011 and 2013

Yoshihara

Matsumura

Tsuzaki

et al. 2014

Journal of Environmental Radioactivity

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“…In addition, it was possible that the leaf longevity and the defoliation timing influence the radiocesium translocation from old tissues to newly developed tissues. Sombré et al (1994) demonstrate that spruce and oak trees translocate radiocesium during the growing season from the reservoir (e.g., trunk and old foliage) to newly developed tissues, resulting in an imbalance in the activity between old and new foliage, whereas no difference in the foliage activity can be observed in winter, irrespective of their age. Sombré et al (1994) also suggest that the translocation of cesium is a circumstantial result of the seasonal translocation of essential elements, especially potassium.…”

Section: Specific Radiocesium Distribution Among Evergreen Speciesmentioning

confidence: 97%

“…Sombré et al (1994) demonstrate that spruce and oak trees translocate radiocesium during the growing season from the reservoir (e.g., trunk and old foliage) to newly developed tissues, resulting in an imbalance in the activity between old and new foliage, whereas no difference in the foliage activity can be observed in winter, irrespective of their age. Sombré et al (1994) also suggest that the translocation of cesium is a circumstantial result of the seasonal translocation of essential elements, especially potassium. Furthermore, as hypothesized by Tagami et al (2011), another possibility is that the morphological characteristics of leaves, such as the surface and topological aspects, contributed to the activity difference through radiocesium deposition and/or weathering.…”

Section: Specific Radiocesium Distribution Among Evergreen Speciesmentioning

confidence: 97%

“…The observations of radionuclide dispersal were conducted not only for the neighboring district of Chernobyl (Tikhomirov and Scheglov, 1994;Fogh and Andersson, 2001;Sokolik et al, 2001;Ramzaev et al, 2006), but also for most parts of Europe, including Belgium (Ronneau et al, 1991;Sombré et al, 1994), Bulgaria (Zhiyanski et al, 2008), England (Bonnet and Anderson, 1993), France (Barci-Funel et al, 1995), Germany (Bunzl and Kracke, 1988), Greece (Clouvas et al, 2005), Spain (Navasa et al, 2012), and Sweden (Melin et al, 1994;Fawaris and Johanson, 1995;McGee et al, 2000;Belyazida et al, 2006). These observations not only provided information regarding the regional and local characteristics of the radionuclide distribution, but they also provided information related to the science associated with forest ecosystems/woody plants, such as plant physiology, meteorology, soil science and physico-chemistry, geomorphology, and radiology.…”

Section: Introductionmentioning

confidence: 99%

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Radiocesium contaminations of 20 wood species and the corresponding gamma-ray dose rates around the canopies at 5 months after the Fukushima nuclear power plant accident

Yoshihara

Matsumura

Hashida

et al. 2013

Journal of Environmental Radioactivity

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Radiocesium ((134)Cs + (137)Cs) deposition from the Fukushima nuclear power plant accident was measured in 20 woody plants (12 evergreen and 8 deciduous species) grown in Abiko (approximately 200 km SSW from the NPP). Leaves (needles) and twigs were sampled from each of three foliar positions (top, middle, and bottom) in the plant canopy in early August 2011. At the time, soils around the plants were also sampled, and gamma radiation dose rates were measured at each sampling position. The average radiocesium activity in the observed leaves of the evergreen species was 7.7 times that in the leaves of the deciduous species. Among the observed evergreen coniferous species, the activity in pre-fallout-expanded leaves was 2.4 times that in the post-fallout-expanded leaves. Notably, a distinct variation in the activity among the evergreen coniferous species could be observed for the post-fallout-expanded leaves but not for the pre-fallout-expanded leaves. Although these differences depend on whether the leaves had expanded at the time of the fallout, it is probable that a considerable amount of radiocesium was translocated to newly developed leaves at a species-specific rate. In addition, it was demonstrated that dose rates around woody plants were not consistent with the prevailing prediction that general dose rates correspondingly decrease with monitoring height from the ground. Thus, the dose rates in the top foliar layer of the deciduous species decreased more than predicted, whereas those in the top foliar layer of the coniferous species did not decrease. This may be due to differences in the balance between the attenuation resulting from a shielding effect of the plant bodies and the higher radiocesium accumulation in the leaves.

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Identification of processes governing long-term accumulation of 137 Cs by forest trees following the Chernobyl accident

Fesenko¹,

Soukhova²,

Санжарова³

et al. 2001

Radiation and Environmental Biophysics

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The regularities of 137Cs distribution in trees (Pinus sylvestris and Betula pendula) growing in different types of forest ecosystems were investigated. High levels of heterogeneity of 137Cs activity concentrations in different parts of the trees, resulting from their varied metabolism have been shown. The data obtained demonstrate a non-uniform character of 137Cs distribution along the trunks, which can be explained by radionuclide fixation by the xylem vessel walls and by geometry changes along the tree trunk. It has been found that the radial distribution of 137Cs in the tree trunk is dependent on the availability of 137Cs in soil, which governs the transfer of this radionuclide via xylem sap and on the properties of the xylem. The accumulation of 137Cs by trees was influenced by the vertical distribution and availability of 137Cs in the soil as well as by the root biomass distribution in different soil horizons. A bioavailability factor, which takes into account the vertical distribution of radiocesium in soil, bioavailability of this radionuclide and distribution of root biomass in different soil horizons is proposed for comparative analyses of 137Cs transfer from soil to trees in different types of forest ecosystems.

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Long-term radiocesium behaviour in spruce and oak forests

Cited by 7 publications

References 0 publications

Changes in radiocesium contamination from Fukushima in foliar parts of 10 common tree species in Japan between 2011 and 2013

Changes in radiocesium contamination from Fukushima in foliar parts of 10 common tree species in Japan between 2011 and 2013

Radiocesium contaminations of 20 wood species and the corresponding gamma-ray dose rates around the canopies at 5 months after the Fukushima nuclear power plant accident

Identification of processes governing long-term accumulation of 137 Cs by forest trees following the Chernobyl accident

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