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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Seasonal and secular δ13C variations in annual growth rings of a Japanese cedar tree from Mt. Amagi, Izu Peninsula, Central Japan

Hiroyuki Kitagawa, Hideki Wada
Geochemical Journal, Vol. 27, No. , P. 391-396, 1993


δ13C fluctuations within a ring and secular δ13C changes of a Japanese cedar tree from Mt. Amagi in the Izu Peninsula, central Japan, are presented. δ13C values within a ring show a characteristic fluctuation in which the δ13C values in the early wood layer are smaller than that in the late wood layer. The mean peak to peak amplitude of the seasonal δ13C fluctuation is 1.4 ± 0.3‰, which has not apparently changed with time during the past 120 years. The δ13C secular change in annual growth rings shows a downward trend with time, with a δ13C rise of about 1‰ between 1940 and 1960. The δ13C falls in annual growth rings of Japanese cedar were 0.55‰ from 1860 to 1940 and 1.05‰ from 1960 to 1980, respectively.

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