In October 2018, seven years and six months after the accident at the Fukushima Daiichi Nuclear Power Plant, attempted regeneration of stands of Konara oak(Quercus serrata)in the deciduous broad-leaves forest located about 20 km from the nuclear power plant was carried out. In order to clarify the factors affecting the concentration of ¹³⁷Cs in individual trees in the same forest area, measurements were taken the following year for ¹³⁷Cs concentration in sprouting branches, ¹³⁷Cs concentration in soil, concentration of exchangeable bases and other chemical properties, the length and diameter of sprouting branches collected, the number of sprouting branches per stump, and the cross-sectional area of stumps in the first year after logging, when the effects of fallout on mother trees were considered to be significant. Negative correlation was recognized between ¹³⁷Cs concentration in sprout branch and the amount of exchangeable K in soil similar to previously reported. As a result of multiple regression analysis, the factor related to the ¹³⁷Cs concentration of the sprout branch was the largest contribution of exchangeable K, followed by stump cross-sectional area showing a positive correlation. The cross-sectional area of the stump might be considered a noteworthy factor for improving the accuracy of future concentration prediction of forests for mushroom logs.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract