No abstract

This study was carried out to examine the relationships between seasonal variations of soil CO 2 efflux rates and soil environmental factors in matured Pinus densiflora and Quercus variabilis stands in the Wola national experimental forests, southern Korea. Soil CO 2 efflux rates were measured monthly from March 2015 to February 2016. Mean soil CO 2 efflux rates during the study period were significantly higher in the Q. variabilis (mean±standard error; 2.27±0.22 μmol m -2 s -1 ) than in the P. densiflora (1.63±0.12 μmol m -2 s -1 ) 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. Q 10 values were higher in the Q. variabilis (3.35) than in the P. densiflora (2.72) stands. The results indicate that soil CO 2 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.