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벼논에서 폐쇄형 자동 챔버 시스템으로 측정한 메탄 농도에 대한 요인별 측정 불확도 비교
주옥정 ( Ok Jung Ju ),강남구 ( Namgoo Kang ),임갑준 ( Gap June Lim ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.3
BACKGROUND: The closed chamber method is the most commonly used for measuring greenhouse gas emissions from rice fields. This method has the advantages of being simple, easily available and economical. However, a measurement result using the chamber method is an estimated value and is complete when the uncertainty is estimated. The methane emissions from a rice paddy account for the largest portion of the greenhouse gas emissions in the agriculture sectors. Although assessment of uncertainty components affecting methane emission from a rice paddy is necessary to take account of dispersion characteristics, research on these uncertainty components is very rare to date. The goal of this study was to elucidate influencing factors on measurement uncertainty of methane concentrations measured by a closed automated chamber system from a rice paddy. METHODS AND RESULTS: The methane sampling system is located in the rice paddy in Gyeonggi-do Agricultural Research and Extension Services (37° 13′15″ N, 127° 02′22″E). The primary measurement uncertainty components influencing methane concentrations (influencing factors) investigated in this research were repeatability, reproducibility and calibration in the aspects of methane sampling and analytical instrumentation. The magnitudes of the relative standard uncertainty of each influencing factor were quantified and compared. CONCLUSION: Results of this study showed what influencing factors were more important in determination of methane concentrations measured using the chamber system and analytical instrumentation located in the monitoring site. Quantifying the measurement uncertainty of the methane concentrations in this study would contribute to improving measurement quality of methane fluxes.
밭토양에서 폐쇄형 자동 챔버법으로 측정한 아산화질소 농도에 대한 측정 불확도
주옥정 ( Ok Jung Ju ),강남구 ( Namgoo Kang ),임갑준 ( Gap June Lim ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.3
BACKGROUND: The closed chamber method is the most commonly used for measuring greenhouse gas emissions from upland fields. This method has the advantages of being simple, easily available and economical. However, uncertainty estimation is essential for accurate assessment of greenhouse gas emissions and verification of emission reductions. The nitrous oxide emissions from upland field is very important for the nitrogen budget in the agriculture sectors. Although assessment of uncertainty components affecting nitrous oxide emission from upland field is necessary to take account of dispersion characteristics, research on these uncertainty components is very rare to date. This study aims at elucidation of influencing factors on measurement uncertainty of nitrous oxide concentrations measured by an automated open closed chamber method from upland field. METHODS AND RESULTS: The nitrous oxide sampling system is located in the upland field in Gyeonggi-do Agricultural Research and Extension Services (37°13′22″ N, 127° 02′22″E). The primary measurement uncertainty components influencing nitrous oxide concentrations (influencing factors) investigated in this research are repeatability, reproducibility and calibration in the aspects of nitrous oxide sampling and analytical instrumentation. The magnitudes of the relative standard uncertainty of each influencing factor are quantified and compared. CONCLUSION: Results of this study show what influencing factors are more important in determination of nitrous oxide concentrations measured using the automated open closed chambers located in the monitoring site. Quantifying the measurement uncertainty of the nitrous oxide concentrations in this study would contribute to improving measurement quality of nitrous oxide fluxes.
볏짚 시용에 따른 벼 재배 논에서의 메탄 배출계수 개발에 관한 연구
주옥정 ( Ok Jung Ju ),원태진 ( Tae Jin Won ),조광래 ( Kwang Rae Cho ),최병열 ( Byoung Rourl Choi ),서재순 ( Jae Sun Seo ),박인태 ( In Tae Park ),김건엽 ( Gun Yeob Kim ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.3
BACKGROUND: Accurate estimates of total direct CH4 emissions from croplands on a country scale are important for global budgets of anthropogenic sources of CH4 emissions and for the development of effective mitigation strategies. Methane production resulted by the anaerobic decomposition of organic compounds where CO2 acts as inorganic electron acceptor. This process could be affected by the addition of rice straw, water management and rice variety itself. METHODS AND RESULTS: Rice (Oryza sativa L. Japonica type, var Samkwangbyeo) was cultivated in four plots: (1) Nitrogen-Phosphorus-Potassium (NPK) (N-P2O5-K2O:90-45-57 kg/ha); (2) NPK plus 3 Mg/ha rice straw (RS3); (3) NPK plus 5 Mg/ha rice straw (RS5); (4) NPK plus 7 Mg/ha rice straw (RS7) for 3 years (2010-2012) and the rice straw incorporated in fall (Nov.) in Gyeonggi-do Hwaseong-si. Gas samples were collected using the closed static chamber which were installed in each treated plot of 152.9 m2. According to application of 3, 5, 7 Mg/ha of rice straw, methane emission increased by 46, 101, 190%, respectively, compared to that of the NPK plot. CONCLUSION(S): We obtained a quantitative relationship between CH4 emission and the amount of rice straw applied from rice fields which could be described by polynomial regression of order 2. The emission scaling factor estimated by the relationship were in the range of IPCC GPG (2000).
연구논문 : PAA(Polyaspartic Acid) 함유 복합비료가 벼 생육 및 벼 재배 논에서의 메탄 발생에 미치는 영향 연구
주옥정 ( Ok Jung Ju ),이종형 ( Jeong Hyung Lee ),최병열 ( Byoung Rourl Choi ),원태진 ( Tae Jin Won ),조광래 ( Kwang Rae Cho ),서재순 ( Jae Sun Seo ),김영순 ( Young Sun Kim ),박인태 ( In Tae Park ) 한국환경영향평가학회 2013 환경영향평가 Vol.22 No.6
This study was carried out to investigate the effects of the complex fertilizers containing polyaspartic acid (PAA) on growth and CH4 emission in rice field and optimum application rate of the fertilizer compared to the standard recommended application rate (control). The PAAcontaining complex fertilizers (PCF) were applied at 55, 65 and 75% levels of standard recommended application rate (control). The application rate of PAA in the plot of every PCF treatment was 150g ai/10a. The PCF was applied as a basal dressing without topdressing at tillering stage. The growth parameters of rice and its nitrogen use efficiency treated with PCF at a 65 to 75% level were not different compared with those of control, and the rice yield was also not significantly different between PCF at a 65 to 75% level and control during 2 years(2010~2011) field experiment. And the NH4-N content in soil was not affected by 65% to 75% level of PCF treatment. Considering overall research results such as rice yield and growth parameters PCF is not significantly different with the control and the optimum application rate of the PCF as a basal fertilization was determined to be 65~75% of the standard application rate based on the result in rice cultivation. Moreover, CH4 emission rate was significantly reduced by PCF treatments, showing 216 kg and 229 kg CH4/ha at 65% and 75% PCF treatment level, respectively, compared to 266 kg CH4/ha of the control.
05 포스터 발표 : 토양환경 분야PS-04 ; 국내 주요 논토양 토성별 메탄발생 잠재력 평가에 관한 연구
주옥정 ( Ok Jung Ju ),조광래 ( Kwang Rae Cho ),김대균 ( Dae Kyun Kim ),김영순 ( Young Sun Kim ),박인태 ( In Tae Park ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
메탄은 담수환경 조건에서 비교적 많이 발생하며 이와 관련된 연구로는 유기물의 투입에 따른 메탄 생성, 기후조건 등 주변 환경조건에 따른 메탄생성, 벼의 품종별 및 물 관리에 따른 메탄 생성등이 있다. 그러나 대부분의 연구가 메탄 순방출량(net flux)에 집중되어 있으며, 토양생태학적인 메탄 발생의 기작구명 연구는 거의 진행되지 않고 있다. 따라서 본 연구에서는 메탄 발생 저감 기술 개발을 위한 기초자료로 활용코자, 국내 주요 논토양 8개 지역 27지점에 대해 무작위 샘플링법으로 토양시료를 채취하여 메탄생성균, 산화균, 발생량 등을 분석하였다. 토양시료채취는 2013년 4월, 10월,2014년 3월에 실시하였으며, core sampler 안에 acryl로 제작된 직경 4.9cm, 높이 5cm의 용기를 장착하여 채취한 후 밀봉하여 실험실로 운반하였다. 메탄발생량은 WFPS (Water- Filled Pore Space)100% 조건하에서 28℃ 항온.항습기에서 48~72시간 배양하여 측정하였으며, 토양 DNA추출은 토양0.3~0.5g을 취하여 Ultra Clean Soil DNA Isolation Kit (MoBio Laboratories, Solana Beach, CA,USA)을 이용하여 분석하였다. 메탄 생성균 및 산화균의 풍부도는 RT-qPCR방법을 이용해 측정하였으며, CFX96TM Real-time PCR Detection System(Bio-Rad, Hercules, CA, USA)과 SYBR Green (Bio-Rad, Hercules, CA, USA) 검출 용액이 사용되었다. 토성별 평균 메탄발생량 및 메탄산화균의 풍부도는 sand 함량이 가장 많고(77%) clay 함량이 적은(2% 미만) 양질사토(loamy sand)에서 가장 크게 나타났으며, 대체로 clay 함량이 많은 토양에서 메탄 발생량이 작은 경향이었다.
자동 샘플링 및 분석 시스템에 의한 벼논 메탄 농도 측정불확도 평가
강남구 ( Nam-gu Gang ),주옥정 ( Ok Jung Ju ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0
온실가스 배출량의 정확한 평가와 배출량 감소 검증을 위해서는 불확도 추정이 필수적이다. 챔버에 의한 수동 가스 샘플링 및 가스크로마토그래피는 논토양으로부터 온실 가스 배출량을 측정하는 데 가장 일반적으로 사용된다. 논토양에서 발생하는 메탄 배출량에 영향을 미치는 불확도 요인의 평가는 산포 특성을 고려하는 것이 필요하지만 현재까지 이러한 불확도 요인에 대한 연구는 매우 드물다. 본 연구는 벼논에서 자동화된 챔버 가스 샘플링과 GC-FID 분석에 의한 메탄 농도의 측정 불확도에 대한 영향 요인을 설명하는 것을 주요 목표로 한다. 본 연구에서 조사된 메탄 농도에 영향을 미치는 주요 측정 불확도 요인은 메탄 샘플링 시스템 및 가스분석시스템과 연관되어 있다. 본 연구에서는 메탄 측정 농도에 미치는 각 불확도 요인의 상대표준불확도의 크기를 정량하였다. 그리고 이 개별 상대표준불확도를 합성하여 메탄 농도의 상대측정불확도를 산정하였다. 또한 메탄 농도의 상대표준불확도에 영향을 미치는 각 불확도 요인의 상대적인 기여도를 산정하였다. 이 연구 결과는 벼논 메탄 플럭스 산정치의 불확도를 추정하고 신뢰성을 보증하기 위한 기초 정보로 활용하고자 한다.