벼논에서 양분관리별 탄소의 흡수·배출에 대한 탄소수지 평가
Evaluation of Carbon Balance for Carbon Sink/Emission with Different Treatments in Paddy Field
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초록
토양 유기탄소 축적량 변화와 작물의 생태계 탄소 수지를 파악하기 위하여 농업의 탄소 관리에 필요한 기초 자료 마 련을 위하여 2014~2016년 (3년) 벼 재배기간 동안 토양의 유기탄소 축적량과 작물의 생태계 순 생산량을 측정하였다. 그 결과로 벼 재배지 토양 유기탄소 축적량은 NPK+볏짚퇴 비 처리 (3.88 Mg C ha-1)에서 가장 많았고 NPK (화학비료) 처리보다 40.8%, NPK+헤어리베치 처리보다 17.0%의 축 적 효과가 있었다. 그러나 NPK+볏짚퇴비 처리가 NPK+헤 어리베치에 비해 토양 유기탄소 축적량이 높게 나타나 헤어 리베치 시용에 비해 볏짚퇴비 시용이 농경지 내 탄소 축적 량이 높은 것으로 나타났다. 벼 재배지 생태계 순 생산량은 NPK 처리 (11.31 Mg C ha-1)에 비해 NPK+헤어리베치 처리 (14.01 Mg C ha-1)에서 19.3%와 NPK+볏짚퇴비 처리 (12.6 Mg C ha-1)에서 10.2% 축적 효과가 있었다. 따라서 화학비 료 단일 처리보다 화학비료를 절감하기 위한 유기물 처리가 토양유기탄소 축적 및 재배지의 작물 생태계 탄소 축적량을 증대시키는 효과가 있는 것으로 나타났다.
Abstract
Importance of climate change and its impact on agriculture and environment has increased with the rise in the levels of Green House Gases (GHGs) in the atmosphere. To slow down the speed of climate change, numerous efforts have been applied in industrial sectors to reduce GHGs emission and to enhance carbon storage. In the agricultural sector, several types of research have been performed with emphasis on GHGs emission reduction; however, only a few work has been done in understanding the role of carbon sink on reduction in GHGs emission. In this study, we investigated ecosystem carbon balance and soil carbon storage in an agricultural paddy field. The results obtained were as follows: 1) Evaluation of soil C sequestration in paddy field was average 3.88 Mg CO2 ha-1 following NPK+rice straw compost treatment, average 3.22 Mg C ha-1 following NPK+hairy vetch treatment, and average 1.97 Mg CO2 ha-1 following NPK treatment; and 2) Net ecosystem production (NEP) during the paddy growing season was average 14.01 Mg C ha-1 following NPK+hairy vetch treatment, average 12.60 Mg CO2 ha-1 following NPK+rice straw compost treatment, and average 11.31 Mg CO2 ha-1 following NPK treatment. Therefore, it is proposed that organic matter treatment can lead to an increase in soil organic carbon accumulation and carbon sock of crop ecosystem in fields compared to chemical fertilizers.
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