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Evaluation of carbon cycle in forest by using radiocarbon as a tracer

Atarashi-Andoh, Mariko ; Koarashi, Jun  ; Ishizuka, Shigehiro*; Saito, Takeshi*; Hirai, Keizo*

C-14 is an effective tracer in investigating the carbon dynamics in the environment. In this study, the measurements of C-14 in soil organic matter (SOM) in a deciduous forest were used to determine the turnover time and CO$$_{2}$$ production rate from SOM. In addition, monthly measurements of carbon isotopic ratios in soil-respired CO$$_{2}$$ and atmospheric CO$$_{2}$$ were conducted to characterize the seasonal variation of the contribution of each CO$$_{2}$$ source, such as SOM decomposition and root respiration.

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