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DIVISION S-1—NOTES

Vertical distributions of carbon dioxide diffusion coefficients and production rates in forest soils

Lab. of Forest Hydrology and Erosion Control Engineering, Graduate School of Agricultural and Life Sciences, The Univ. of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan

* Corresponding author (shoji{at}fr.a.u-tokyo.ac.jp)

In this study, we developed a new method for evaluating vertical profiles of CO₂ gas diffusivity and CO₂ gas production in soil samples. The CO₂ flux at the boundary and the steady-state CO₂ gas profile are measured under two boundary gas conditions.The differential form of Fick's second law can then be used to calculate the gas diffusion coefficients and CO₂ production rate. This method was applied to an undisturbed forest soil sample in the laboratory. Both gas diffusion coefficients and CO₂ production rates decreased with increasing depth. The relative gas diffusion coefficients ranged between 0.03 and 0.15, and the CO₂ production rates ranged between 2.1 x 10^-8 and 4.7 x 10^-8 kg CO₂ m³ s^-1 at 20°C. Unsteady changes in the CO₂ concentration profile in the soil column, and flux from the soil surface were successfully simulated with these values.

Abbreviations: condition DR, drier conditions • condition WT, wetter conditions • D/D₀, relative gas diffusion coefficients

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