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- P-ISSN2287-8327
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ISSN : 2287-8327
CO_2 flux in a cool-temperate deciduous forest (Quercus mongolica) of Mt. Nam in Seoul, Korea
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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_2 m^(-2) day^(-1). At the same time, the rate of soil CO_2 efflux was 6.9 g CO_2 m^(-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
- CO_2 flux, eddy covariance technique, Nam-San Ecological Tower Site (NSETS), net ecosystem exchange NEE, Quercus mongolica forest, soil CO_2 efflux
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