에디 공분산 플럭스 자료를 이용한 논, 밭, 과수원의 연간 탄소 흡수량 추정 및 비교

BACKGROUND: To quantify carbon exchange at agricultural ecosystems in South Korea, net ecosystem exchange (NEE) at three croplands including a rice paddy, a bean field and an apple orchard was measured on the basis of the eddy covariance technique. METHODS AND RESULTS: NEE of CO 2 during the growing season (June to September) averaged over the recent two years (2018-2019) was the highest at rice (-4.49 g C m -2 day -1 ), followed by the bean (-3.12 g C m -2 day -1 ) and apple (-0.93 g C m -2 day -1 ). The diurnal variation of NEE was the highest at the rice, while the seasonal variation of it was the highest at the bean than others. In terms of yearly variation, the rice paddy and the bean field absorbed more CO 2 in 2019 compared to 2018, while the apple orchard absorbed less. CONCLUSION: Our results confirmed that these croplands consistently acted as net sinks for CO 2 during the growing season because an amount of CO 2 uptake from photosynthesis was larger than one of its emissions from respiration. The quantification of net CO 2 exchange at agricultural ecosystems may help to better understand the local carbon cycle over various time scales.