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KMID : 1024520140230061131
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Journal of the Environmental Sciences
2014 Volume.23 No. 6 p.1131 ~ p.1142
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Response of Soil CO2 Fluxes to Seasonal Variations in a Grassplot
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Kim Park-Sa
Kwon Byung-Hyuk
Kang Dong-Hwan
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Abstract
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In this study, the variations of the carbon dioxide fluxes were investigated with soil temperatures in the grassplot
and seasonal variations of carbon dioxide concentrations and fluxes were analysed. Soil temperatures, carbon dioxide
concentrations and fluxes were measured on the grassplot in Pukyong National University. Field measurements were
carried out 25 times from March in 2010 to March in 2011 with nine points on the grassplot. Seasonal variations of
carbon dioxide concentrations and fluxes showed an inverse relation. In summer, carbon dioxide concentrations are
lower and carbon dioxide fluxes are higher. In winter, carbon dioxide concentrations are higher and carbon dioxide
fluxes are lower. On the grassplot, carbon dioxide emission rate increase when the soil temperature is more than 20℃
and the emission rate decrease when the soil temperatures are less than 10℃. When the accumulated rainfall for five
days before measurement day is 20~100 mm, it is showed that the more rainfall, the more carbon dioxide emissions.
Carbon dioxide emission rate from the grassplot to the upper atmosphere was increased or decreased by the factors
such as soil temperature, growth and wither of grass and rainfall. The results of this study showed that the emission of
carbon dioxide in the grassplot is dominantly controlled by seasonal factors (especially soil temperature and rainfall).
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KEYWORD
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Grassplot, Carbon dioxide, Flux, Concentration, Soil temperature, Rainfall
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