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This study was carried out to examine the relationships between seasonal variations of soil CO2 efflux rates and soil environmental factors in matured Pinus densiflora and Quercus variabilis stands in the Wola national experimental forests, southern Korea. Soil CO2 efflux rates were measured monthly from March 2015 to February 2016. Mean soil CO2 efflux rates during the study period were significantly higher in the Q. variabilis (mean±standard error; 2.27±0.22 μmol m s) than in the P. densiflora (1.63±0.12 μmol m s) stands. Mean soil water content and pH were also significantly higher in the Q. variabilis (26.96±0.93%, pH 5.19) than in the P. densiflora (21.32±0.89%, pH 4.87) stands, while soil temperature was not significantly different between the P. densiflora (13.92±0.67°C) and in the Q. variabilis (13.52±0.70°C) stands. Q10 values were higher in the Q. variabilis (3.35) than in the P. densiflora (2.72) stands. The results indicate that soil CO2 efflux rates in Q. variabilis stand could be more sensitive by the change of soil temperature compared with P. densiflora stand under a similar site environmental condition.

Seasonal Variations of Soil CO2Efflux Rates and Soil Environmental Factors in Pinus densiflora and Quercus variabilis Stands