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- 저자 : 무하마드모잘멜하크 ( Mozammel Haque ) (검색결과 1 건)
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구두발표(OA)-농업환경 및 토양,수질 분야 : OA-03 ; 벼논에서 유기물 처리량이 높을수록 메탄 발생 억제 효과가 높은 중간낙수 처리
무하마드모잘멜하크 ( Mozammel Haque ),김상윤 ( Sang Yoon Kim ),김길원 ( Gilwon Kim ),김필주 ( Pil Joo Kim ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
Winter cover crop cultivation is recommended to improve soil carbon sequestration and quality. However, its biomass addition as a green manure can significantly increase methane (CH4) in rice paddy soil. There are many soil management practices to reduce CH4 emission in rice paddy soil, but the intermittent drainage is regarded as a key soil management to reduce CH4 emission during rice cultivation. However, it is expected to increase significantly carbon di .oxide (CO2) emission. In this study, the effect of a 30.day intermittent drainage from the 20th day after transplanting (DAT) to the 50th DAT on two greenhouse gas (GHG) fluxes and yield properties were compared with those of a continuous flooding system under different rates of cover crop biomass addition during rice cultivation. The biomass of cover crop which cultivated during the fallow season on site was applied with the different rates (0.100%) of total biomass (12 Mg ha.1 on dried weight). Methane and CO2 gas samples were collected simultaneously twice a week by two different pairs of closed chamber. The effect of intermittent drainage on changing two GHG emissions were compared using the GWP value which was calculated as CO2 equivalents by multiplying 25 to the seasonal CH4 flux. Methane and CO2 emission rates were significantly (p<0.05) increased with increasing application rates of cover crop biomass in both irrigation treatments. The intermittent drainage effectively reduced seasonal CH4 fluxes by ca. 51% to that of the continuous flooding under total biomass removal, but its effect was significantly increased under higher biomass application. The intermittent drainage reduced around 69% of total CH4 flux under total biomass recycling, but increased CO2 fluxes by 18.20% under the same levels of biomass addition. However, the intermittent drainage significantly reduced the total GWP value, and its effect significantly increased under higher biomass addition from 66% to 77%. There was no significant difference in terms of rice yield either in continuous flooding or intermittent irrigation under the same fertilization background. In conclusion, the intermittent drainage could be a good soil management strategy under high levels of biomass addition to reduce GWP value by suppressing effectively CH4 emission.
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