The behavior of gaseous components of forest soil was assessed by simultaneous monitoring of 222Rn, CO2 and its carbon isotopes (δ13C, Δ14C) in soil air under a semi natural forest… Click to show full abstract
The behavior of gaseous components of forest soil was assessed by simultaneous monitoring of 222Rn, CO2 and its carbon isotopes (δ13C, Δ14C) in soil air under a semi natural forest in northern Japan. The isotope ratio of 14C (Δ14C) in soil air CO2 was found to decrease towards late summer, suggesting gradual depletion of easily decomposed soil organic matter. There was a specific case that soil air CO2 with depleted 14C appeared suddenly under snowpack in winter. It is not always appropriate to use soil 222Rn as a tracer of CO2 efflux from the soil surface to the atmosphere.
               
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