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http://dx.doi.org/10.5532/KJAFM.2013.15.3.186

Annual Variation of Soil CO2 Efflux in a Broadleaved Deciduous Forest of the Geumsan (Mt.) Long-Term Ecological Research Site  

Kim, Choonsig (Department of Forest Resources, Gyeongnam National University of Science and Technology)
Lee, Im Kyun (Korea Forest Research Institute)
Lim, Jong Hwan (Korea Forest Research Institute)
Park, Byung Bae (Korea Forest Research Institute)
Chun, Jung Hwa (Korea Forest Research Institute)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.15, no.3, 2013 , pp. 186-190 More about this Journal
Abstract
Soil respiration in forest ecosystems play an important role in global carbon cycle. This study was carried out to determine the annual variation of soil $CO_2$ efflux for 4 years in a broadleaved deciduous forest of the Geumsan (Mt.) Long-Term Ecological Research (GLTER) site in Southern Korea. The soil $CO_2$ efflux in the GLTER site showed annual variations with the fluctuations of annual mean soil temperature, but not with those of soil water content. The annual mean soil $CO_2$ efflux except for winter season was 0.32 g $CO_2\;m^{-2}h^{-1}$ for 2008, 0.40 g $CO_2\;m^{-2}h^{-1}$ for 2009, 0.41 g $CO_2\;m^{-2}h^{-1}$ for 2007, and 0.54 g $CO_2\;m^{-2}h^{-1}$ for 2010. The lowest soil $CO_2$ effluxin 2008 was associated with the lowest soil temperature ($2.0^{\circ}C$) in comparison with those of other years ($13.0-13.5^{\circ}C$). The exponential relationships between monthly soil $CO_2$ efflux and the corresponding soil temperature at the soil depth of 20 cm were significant ($R^2$ = 0.31-0.75, P < 0.05). The results indicate that the annual variation of soil $CO_2$ efflux was attributed to the variations of soil temperature rather than soil water content in the GLTER site.
Keywords
Carbon cycle; LTER; Soil $CO_2$ efflux; Soil respiration;
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