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이길재,최윤실,양승구,이진홍,윤성이,Lee, Gil-Zae,Choi, Yoon-Sil,Yang, Seung-Koo,Lee, Jin-Hong,Yoon, Sung-Yee 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.4
본 연구에 적용된 한국형 무경운(no-tillage)농법은 한국의 기상특성 및 농업현실에 맞도록 초기 두둑을 형성한 후 이를 지속적으로 재활용하는 방식을 적용하였다. 한국형 무경운 농법은 생산량 저하 등 부정적인 영향이 거의 없는 것으로 보고되었으며 경운작업 등 농자재사용은 크게 절감되는 효과로 인하여 에너지 및 농자재 비용의 절감과 노동시간 단축 등 긍정적인 효과가 높은 것으로 보고되었다(Yang et al., 2012). 무경운농법에 의한 고추재배는 일반적인 고추재배 방식과(국가평균) 비교하여 10a ($1,000m^2$)당 $344.7kgCO_2$(58%)의 온실가스저감 효과를 갖는 것으로 분석되었다. 이 중 비료절감에 의한 직-간접효과가 92%, 에너지사용 절감에 의한 효과는 44%로 높은 탄소저감효과를 나타내었다. 또한, 무경운농법의 직접적인 효과에 부가하여 무경운방식의 토양관리는 일반적으로 시간이 흐를수록 토양의 탄소격리 효과가(carbon sequestration effect) 높아지는 특징을 갖고 있기 때문에 연속적인 무경운농법을 수행할 경우 연구대상지의 지속적인 탄소저감 효과가 기대된다. 본 연구의 결과를 바탕으로 한국형 무경운농법은 농업부문 국가온실가스 저감목표 달성을 위한 주요한 녹색농업기술(agro-green technologies)로서 역할을 수행할 것으로 기대되며, 관련기술의 보급 및 확대를 위한 국가적 차원의 노력이 절실히 요구된다. Korean type of no-tillage cultivation method which was applied on this study used the ridge and the furrow and constantly recycling them as it was suitable for Korea's weather and farming conditions. This no-tillage cultivation was reported to have little negative impact such as reduction of production (Kwon et al., 1997). In addition, it was found to have a lot of benefits as it requires less agro-materials and energy costs as well as shortened working hours because tillage operation is not needed. (Yang et al., 2012). According to an analysis, no-tillage cultivation can reduce greenhouse gas emissions by $344.7kgCO^2$ (58%) in every 10a ($1,000m^2$) compared to ordinary pepper farming technique (Korea averages). Direct-indirect reduction effects from using fertilizer and using less amount of energy were 92% and 44% respectively both of which can be considered very high. Besides the direct effects of no-tillage cultivation, soil management using no-tillage technique raises carbon sequestration effect on soil as time goes on (West & Marland, 2002), that is why the technique is expected to have constant carbon emission reduction effect. For theses reasons, distribution and expansion of Korean type no-tillage cultivation are expected to play a role as major agro-green technologies for achieving our goal of reducing greenhouse gas emissions in agricultural sector.
고구마의 생산과정에서 발생하는 탄소배출량 산정 및 전과정평가
소규호(Kyu-Ho So),이길재(Gil-Zae Lee),김건엽(Gun-Yeob Kim),정현철(Hyun-Cheol Jeong),유종희(Jong-Hee Ryu),박정아(Jung-Ah Park),이덕배(Deog-Bae Lee) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.6
고구마 생산체계의 탄소성적을 평가하기 위하여 LCI database 구축하고 전과정 영향평가를 통한 잠재적 환경영향을 평가하였다. 인벤토리 목록구축을 위한 자료 수집 결과 고구마의 투입물 중 유기질비료의 투입비가 71% 매우 높았고, 화학비료는 22%, 투입되는 에너지의 6%의 순이었다. 유기질 비료 투입량은 3.26E-01 kg kg<SUP>-1</SUP> sweetpotato, 무기질비료는 1.02E-01 kg kg<SUP>-1</SUP> sweetpotato, 고구마를 재배할 때 발생되는 직접배출 (CO₂, CH₃, N₂O)은 2.47E-02 kg kg<SUP>-1</SUP> sweetpotato였다. 탄소성적은 4.05E-01 kg CO₂-eq. kg<SUP>-1</SUP> sweetpotato이며, CO₂의 배출량이 2.88E-01 kg CO₂-eq. kg<SUP>-1</SUP> sweetpotato로 전체 온실가스배출 중 71%를 점유하였고, CH₄ 18%, N₂O가 11%였다. 이들의 공정별 기여도 분석결과 CO₂는 비료생산공정과 고구마생산에서 주로 발생하였고, 기여도는 약 32%, 28%였다. N₂O는 고구마를 재배할 때 가장 많이 발생되었고, 기여도는 약 90%였다. 전과정 영향평가 결과 비료생산은 모든 영향범주에서 가장 큰 기여도를 나타내었다. GWP (지구온난화범주)에서 고구마재배에 의한 기여가 약 12% 정도였으며, 비료생산은 약 90%였다. GWP와 POCP (광화학산화물생성) 범주의 특성화 값은 각각 4.05E-01 CO2-eq. kg<SUP>-1</SUP>, 5.08E-05 kg C₂H₄-eq. kg<SUP>-1</SUP>이었다. LCA (Life Cycle assessment) was carried out to estimate on carbon footprint and to establish of LCI (Life Cycle Inventory) database of sweetpotato production system. Based on collecting the data for operating LCI, it was shown that input of organic fertilizer was value of 3.26E-01 kg kg<SUP>-1</SUP> and it of mineral fertilizer was 1.02E-01 kg kg<SUP>-1</SUP> for sweetpotato production. It was the highest value among input for sweetpotato production. And direct field emission was 2.47E-02 kg kg<SUP>-1</SUP> during sweetpotato cropping. The result of LCI analysis focussed on greenhouse gas (GHG) was showed that carbon footprint was 4.05E-01 kg CO2-eq. kg<SUP>-1</SUP> sweetpotato. Especially CO2 for 71% of the GHG emission and the value was 2.88E-01 kg CO2-eq. kg<SUP>-1</SUP> sweetpotato. Of the GHG emission CH4, and N2O were estimated to be 18% and 11%, respectively. It might be due to emit from mainly fertilizer production (32%) and sweetpotato cultivation (28%) for sweetpotato production system. N2O emitted from sweetpotato cultivation for 90% of the GHG emission. With LCIA (Life Cycle Impact Assessment) for sweetpotato production system, it was observed that the process of fertilizer prodcution might be contributed to approximately 90% of GWP (global warming potential). Characterization value of GWP and POCP were 4.05E-01 CO2-eq. kg<SUP>-1</SUP> and 5.08E-05 kg C2H4-eq. kg<SUP>-1</SUP>, respectively.
콩의 생산과정에서 발생하는 탄소배출량 산정 및 전과정평가
소규호(Kyu-Ho So),이길재(Gil-Zae Lee),김건엽(Gun-Yeob Kim),정현철(Hyun-Cheol Jeong),유종희(Jong-Hee Ryu),박정아(Jung-Ah Park),이덕배(Deog-Bae Lee) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.6
투입되는 퇴구비, 무기질 비료, 농자재 (육묘용 플러그판), 에너지 (전기, 화석연료)양은 각각 3.10E+00 kg kg<SUP>-1</SUP> soybean, 4.57E-01 kg kg<SUP>-1</SUP> soybean, 6.29E-02kg kg<SUP>-1</SUP> soybean, 8.48E-02 kg kg<SUP>-1</SUP> soybean이었 고, 콩 생산단계에서 발생하는 직접 대기배출물 (CO₂, CH₄, N₂O)의 배출량은 1.48E-01 kg kg<SUP>-1</SUP> soybean였다. LCI 분석 결과 콩 생산체계의 탄소원단위 성적은 3.36E+00 kg CO₂-eq kg<SUP>-1</SUP> soybean였고, 온실가스 발생량 비중을 비교하면 CO₂가 71%, CH₄ 18%, N₂O 11% 이었다. CO₂는 비료생산 (약 92%)과 콩생산 (약 7%)에서 주로 발생하였고, N2O의 주요 발생원은 콩 생산 (약67%)과 비료생산 (약 32%)순이었는데, CO2, N2O의 CO2-eq. 환산 성적은 각각 2.36E+00 kg CO2-eq kg<SUP>-1</SUP> soybean과 3.50E-01 kg CO2-eq kg<SUP>-1</SUP> soybean였다. 전과정 영향평가 수행결과 GWP의 특성화값은 3.36E+00 kg CO2-eq kg<SUP>-1</SUP>였고, 콩 생산과 비료 생산이 주요한 원인이었다. This study was carried out to estimate carbon emission using LCA (Life Cycle Assessment) and to establish LCI (Life Cycle Inventory) database of soybean production system. Based on collecting the data for operating LCI, it was shown that input of organic fertilizer was value of 3.10E+00 kg kg<SUP>-1</SUP> soybean and it of mineral fertilizer was 4.57E-01 kg kg<SUP>-1</SUP> soybean for soybean cultivation. It was the highest value among input for soybean production. And direct field emission was 1.48E-01 kg kg<SUP>-1</SUP> soybean during soybean cropping. The result of LCI analysis focussed on greenhouse gas (GHG) was showed that carbon footprint was 3.36E+00 kg CO2-eq kg<SUP>-1</SUP> soybean. Especially CO2 for 71% of the GHG emission. Also of the GHG emission CH4, and N2O were estimated to be 18% and 11%, respectively. It might be due to emit from mainly fertilizer production (92%) and soybean cultivation (7%) for soybean production system. N2O was emitted from soybean cropping for 67% of the GHG emission. In CO2-eq. value, CO2 and N2O were 2.36E+00 kg CO2-eq. kg<SUP>-1</SUP> soybean and 3.50E-01 kg CO2-eq. kg<SUP>-1</SUP> soybean, respectively. With LCIA (Life Cycle Impact Assessment) for soybean production system, it was observed that the process of fertilizer production might be contributed to approximately 90% of GWP (global warming potential). Characterization value of GWP was 3.36E+00 kg CO2-eq kg<SUP>-1</SUP>.