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The soil CO2 evolution rate was measured in a virgin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg/(m2·h) and appeared at 6:00 a.m. The highest value was 460 mg/(m2·h) at 18:00. The rates of CO2 evolution were related with soil temperature. On the basis of the constructed regression equation and the monthly average values of temperature, the magnitude...