Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 161, Issue -, Pages 35-41Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2016.04.033
Keywords
Spatial heterogeneity; Radiocesium; Stemflow; Throughfall; Canopy interception
Categories
Funding
- Japan Society for the Promotion of Science KAKENHI Grant [15J03548]
- Hiroshima University Phoenix Leader Education Program (Hiroshima Initiative) for the Renaissance from Radiation Disaster - Ministry of Education, Culture, Sports, Science and Technology
- Grants-in-Aid for Scientific Research [15J03548] Funding Source: KAKEN
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The spatial variation of the radiocesium inventory in forest soil was studied c.a. 44 km northwest of the Fukushima Daiichi Nuclear Power Plant, Japan. This study focuses on the effects of canopy interception and downward transfer from the forest canopy to the forest floor via stemflow and throughfall. We established a study plot (400 m(2)) in the canopy layer of a secondary mixed deciduous forest dominated by Japanese oak (Quercus crispula) and Japanese fir (Abies firma), in August and November 2014. Soil was sampled from 0 to 5 cm depth and Cs-137 was measured under the canopy using a 2-m grid and also at the tree trunk bases. We divided the study plot into the five different types of subplot according to the canopy projection areas and the tree species for the analysis. The geometric mean and coefficient of variation of the Cs-137 inventory were 202 kBq m(-2) and 0.11 (0.52 in the arithmetic coefficient of variation), respectively. Within the forest, the variation in the Cs-137 inventory under trees was larger than in crown gap areas. The large spatial variation may be attributed to canopy interception of the initial deposition and downward transfer of radiocesium via stemflow and throughfall. (C) 2016 Elsevier Ltd. All rights reserved.
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