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http://dx.doi.org/10.5532/KJAFM.2016.18.3.120

Seasonal Variations of Soil CO2 Efflux Rates and Soil Environmental Factors in Pinus densiflora and Quercus variabilis Stands  

Baek, Gyeongwon (Gyeongnam National University of Science and Technology)
Jo, Chang Gyu (Gyeongnam National University of Science and Technology)
Kim, Choonsig (Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.18, no.3, 2016 , pp. 120-126 More about this Journal
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 ($mean{\pm}standard$ error; $2.27{\pm}0.22{\mu}mol\;m^{-2}s^{-1}$) than in the P. densiflora ($1.63{\pm}0.12{\mu}mol\;m^{-2}s^{-1}$) stands. Mean soil water content and pH were also significantly higher in the Q. variabilis ($26.96{\pm}0.93%$, pH 5.19) than in the P. densiflora ($21.32{\pm}0.89%$, pH 4.87) stands, while soil temperature was not significantly different between the P. densiflora ($13.92{\pm}0.67^{\circ}C$) and in the Q. variabilis ($13.52{\pm}0.70^{\circ}C$) 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.
Keywords
Carbon cycling; Carbon dynamic; $Q_{10}$ value; Soil respiration; Soil temperature;
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