Journal of Korean Society of Agricultural Engineers ISSN:1738-3692(Print) 2093-7709(Online) 한국농공학회논문집

This study analyzed the impacts of weather (rainfall) and soil environmental (soil temperature and moisture) conditions on soil carbon dioxide (soil CO₂) dynamics according to different land uses. The study sites of Daegu research forest, Chuncheon upland farm and Buan research forest were selected to measure the soil environmental (soil characteristics, soil temperature and soil moisture) variables. The strong correlation was observed between the soil temperature and soil CO₂ values at Daegu, Chuncheon and Buan. However, the correlation between the soil CO₂ and soil moisture was significantly higher at Chuncheon compared to those of Daegu and Buan. The organic matter was artificially supplied for cultivating crops with tillage at Chuncheon. When the soil temperature exceeded over 20°C, the rapid decomposition of organic matter might cause a sharp increase in the soil CO₂ concentration. Usually, the soil CO₂ is released into the atmosphere through soil pores, but the high soil moisture that blocks the soil pores can restrict the movement of soil CO₂ and lead to a sharp rise in the soil CO₂ concentrations. Consequently, the soil CO₂ is influenced by increases in the soil temperature, while the soil moisture appears to affect the sequestration of the soil CO₂ within the soil matrix. Thus, the findings of this study can serve as the basic data for reducing soil carbon emissions in response to the climate crisis.