Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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CO2 flux in a cool-temperate deciduous forest (Quercus mongolica) of Mt. Nam in Seoul, Korea

  • Joo, Seung-Jin (Center for Atmospheric and Environmental Modeling, Seoul National University) ;
  • Park, Moon-Soo (Center for Atmospheric and Environmental Modeling, Seoul National University) ;
  • Kim, Gyung-Soon (Department of Biology, Graduate School of Seoul Women's University) ;
  • Lee, Chang-Seok (Faculty of Environment and Life Sciences, Seoul Women's University)
  • Received : 2010.12.24
  • Accepted : 2011.01.03
  • Published : 2011.03.01
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Abstract

The Namsan Ecological Tower Site based on a flux tower was equipped with eddy covariance and automatic opening/closing chamber systems to collect long-term continuous measurements of $CO_2$ flux, such as the net ecosystem exchange (NEE) and soil $CO_2$ efflux in a cool-temperate Quercus mongolica forest. The mean concentrations of atmospheric $CO_2$ ($705\;mg/m^3$) during the summer were smaller than those measured ($770\;mg/m^3$) during the winter. The mean $CO_2$ flux during the summer period was negative ($-0.34\;mg\;m^{-2}\;s^{-1}$), while that during the winter period was positive ($0.14\;mg\;m^{-2}\;s^{-1}$). $CO_2$ was deposited from the atmosphere to the surface in the summer. The daily mean value of soil $CO_2$ efflux increased from spring to summer. The seasonal pattern in the rate of soil $CO_2$ efflux tightly followed the seasonal pattern in soil temperatures. The $Q_{10}$ values for soil $CO_2$ efflux varied in a range from 2.12 to 3.26, and increased with increasing soil depth. The maximum value of total carbon uptake (i.e., NEE) during the growing season was $-8\;g\;CO_2m^{-2}\;day^{-1}$. At the same time, the rate of soil $CO_2$ efflux was $6.9\;g\;CO_2m^{-2}\;day^{-1}$. The amplitude of flux variations in NEE was approximately 14% larger than those in soil $CO_2$ efflux. These results suggest that in cool-temperate regions of the Korean peninsula, the forest ecosystem of Q. mongolica may have a larger atmospheric $CO_2$ uptake, due primarily to its high photosynthetic capacity and low ecosystem respiration.

Keywords

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