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The relationship between CO 2  flow from soil and soil CO 2  concentration was investigated at 72 permanent sampling points at two forested post-mining sites in the northwest of the Czechia. Based on the entire data set (72 points sampled monthly during the growing season), CO 2  flow from the soil was positively correlated with soil CO 2  concentration. CO 2  concentration in deeper soil layers was positively correlated with root biomass and negatively correlated with soil microbial respiration. In individual sampling points relationship between CO 2  flow and soil CO 2  concentration varied from being significantly positive (30% of points) to significantly negative (7%) but mostly being non-significant (63%). The positive correlation occurred at points with high root biomass in deeper soil layers, while the negative correlation occurred at points with high soil microbial respiration per cm 3  of soil. Laboratory experiments showed that the CO 2  produced by microbial respiration can reduce microbial respiration but that CO 2  produced by root respiration did not reduce root respiration. The results indicate that when soil ventilation is poor, microbial respiration can sufficiently increase soil CO 2  concentration so as to reduce microbial respiration, which greatly increases the variability in the relationship between CO 2  flow from soil and soil CO 2  concentration.

Flow of CO2 from soil may not correspond with CO2 concentration in soil