Concentration Dependence of CO_2, Evolution from Soil in Chamber with Low CO_2 Concentration (<2,000 ppm), and CO_2 Diffusion/Sorption Model in Soil

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Concentration dependence of Co_2 evolution from soil was studied under field and laboratory conditions. Under field conditions, when the CO_2 concentration was measured with an infrared gas analyzer (IRGA) in a small and column-shaped chamber placed on the ground, the relationship among the CO_2 concentration c (m^3 m^<-3>), time t (h), height of the chamber h, a constant rate of CO_2 evolution from the soil v (m^3 m^<-2> h^<-1>), and an appropriate constant k, was expressed by thefollowing equation, dc/dt=v/h-k(c-a) (c=a at t=0). Although most of the data of measured CO_2 evolution fitted to this equation, the applicability of the equation was limited to the data to which a linear equation could not be fitted, because the estimated value of v had a larger error than that estimation could not be fitted, because the estimated value of v had a larger error than that estimated by linear regression analysis, as observed by computer simulation. The concentration dependence shown above and some other vaiations were analyzed based on a sorption/diffusion model, i.e. they were associated with CO_2-sorption by the soil and modified by the conditions of CO_2 diffusion in the soil.
社団法人日本土壌肥料学会の論文