산림, 농업 및 초지의 토양이산화탄소 변동 특성 분석

Abstract

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 selectedto measure the soil environmental (soil characteristics, soil temperature and soil moisture) variables. The strong correlation was observed between thesoil temperature and soil CO2 values at Daegu, Chuncheon and Buan. However, the correlation between the soil CO2 and soil moisture was significantlyhigher 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 movementof 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, whilethe 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 datafor reducing soil carbon emissions in response to the climate crisis.