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Rain-induced bioecological resuspension of radiocaesium in a polluted forest in Japan.
Scientific Reports ( IF 4.6 ) Pub Date : 2020-09-18 , DOI: 10.1038/s41598-020-72029-z
Kazuyuki Kita 1 , Yasuhito Igarashi 1, 2, 3 , Takeshi Kinase 4, 5 , Naho Hayashi 1 , Masahide Ishizuka 6 , Kouji Adachi 4 , Motoo Koitabashi 7 , Tsuyoshi Thomas Sekiyama 4 , Yuichi Onda 8
Affiliation  

It is the conventional understanding that rain removes aerosols from the atmosphere. However, the question of whether rain plays a role in releasing aerosols to the atmosphere has recently been posed by several researchers. In the present study, we show additional evidence for rain-induced aerosol emissions in a forest environment: the occurrence of radiocaesium-bearing aerosols in a Japanese forest due to rain. We carried out general radioactive aerosol observations in a typical mountainous village area within the exclusion zone in Fukushima Prefecture to determine the impacts and major drivers of the resuspension of radiocaesium originating from the nuclear accident in March 2011. We also conducted sampling according to the weather (with and without rain conditions) in a forest to clarify the sources of atmospheric radiocaesium in the polluted forest. We found that rain induces an increase in radiocaesium in the air in forests. With further investigations, we confirmed that the fungal spore sources of resuspended radiocaesium seemed to differ between rainy weather and nonrainy weather. Larger fungal particles (possibly macroconidia) are emitted during rainy conditions than during nonrainy weather, suggesting that splash generation by rain droplets is the major mechanism of the suspension of radiocaesium-bearing mould-like fungi. The present findings indicate that radiocaesium could be used as a tracer in such research fields as forest ecology, meteorology, climatology, public health and agriculture, in which fungal spores have significance.



中文翻译:

日本受污染森林中放射性铯的降雨诱导生物生态再悬浮。

传统的理解是,雨水会从大气中去除气溶胶。然而,最近有几位研究人员提出了降雨是否在向大气释放气溶胶方面起作用的问题。在本研究中,我们展示了森林环境中降雨引起的气溶胶排放的额外证据:日本森林中因降雨而产生的含放射性铯的气溶胶。我们在福岛县禁区内的一个典型山区进行了一般放射性气溶胶观测,以确定 2011 年 3 月核事故中放射性铯再悬浮的影响和主要驱动因素。我们还根据森林中的天气(有雨和无雨)进行了采样,以明确污染森林中大气放射性铯的来源。我们发现降雨会导致森林空气中放射性铯的增加。通过进一步调查,我们证实重悬浮放射性铯的真菌孢子来源似乎在雨天和非雨天之间有所不同。与非雨天相比,雨天会释放出更大的真菌颗粒(可能是大分生孢子),这表明雨滴产生的飞溅是含放射性铯的霉菌样真菌悬浮的主要机制。目前的研究结果表明,放射性铯可用作森林生态学、气象学、气候学、公共卫生和农业等研究领域的示踪剂,

更新日期:2020-09-20
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