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돈분 액비 시용 논에서 양분흡착제 처리에 따른 담수 중 질소, 인, 유기탄소 농도 변화
함종현 ( Jong-hyun Ham ),임상선 ( Sang-sun Lim ),이광승 ( Kwang-seung Lee ),전병준 ( Byeong-jun Jeon ),이세인 ( Se-in Lee ),박현진 ( Hyun-jin Park ),윤광식 ( Kwang-sik Yoon ),김한용 ( Han-yong Kim ),최우정 ( Woo-jung Choi ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-
As liquid pig manure (LM) contains essential macro- and micro-nutrient for crop growth and their availability is high, LM can be used as an alternative nutrients source. However, application of LM may cause water pollution via surface runoff due to a high mobility of nutrients in the LM. In this context, application of fly ash (FA) and zeolite (Z) may reduce water pollution potential of LM-applied paddy as Ca-enriched FA has potential to adsorb P and Z can adsorb various substances including positive charged ions including NH<sub>4</sub> <sup>+</sup>. This study was conducted to investigate the effects of application of FA and Z on the concentration of nitrogen (N), phosphorus (P), and dissolved organic C (DOC) in the floodwater of rice paddy fertilized with LM. Four treatments were laid out including no input (Control), synthetic fertilizer (SF), high-concentration liquid manure (M<sub>H</sub>), and low-concentration liquid manure (M<sub>L</sub>) in triplicates. Both FA and Z were hand-mixed with top soil (20 cm) at 5% (equivalent to 13 kg/m<sup>2</sup>). During rice growth, flood water samples were periodically collected on 1, 3, 5, 7, 10, 25 day after transplanting (DAT). In the early period up to 5 DAT, application of FAZ increased T-N and DOC concentration probably due to soil disturbance by FAZ application; however, thereafter it was decreased by FAZ application, suggesting that application of FAZ at least 5 days before rice transplanting may be helpful in reducing T-N and DOC concentrations of floodwater. On the other hand, concentration of T-P in floodwater consistently increased by FAZ throughout the entire experiment period. It was suspected that adsorption of Ca<sup>2+</sup> in FA, which is responsible for P removal, on to negatively charged sites of Z interrupted Ca-P precipitation. It was concluded that application of FAZ can reduce T-N and DOC concentrations of floodwater particularly when they applied in advance of rice transplanting.
05 포스터 발표 : 토양환경 분야PS-06 ; 액비 농도, 시비량, 분시비율에 따른 벼 생육과 담수 중 양분 함량 변화
함종현 ( Jong Hyun Ham ),임상선 ( Sang Sun Lim ),이광승 ( Kwang Seung Lee ),전병준 ( Byeong Jun Jeon ),이세인 ( Se In Lee ),박현진 ( Hyun Jin Park ),윤광식 ( Kwang Sik Yoon ),최우정 ( Woo Jung Choi ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
돈분 액비는 속효성으로 화학비료를 대체할 수 있지만, 반대로 수계로 쉽게 유출되어 수질오염원으로 작용할 수 있다. 본 연구는 액비 시용 방법(액비 종류, 시용량, 분시비율)에 따른 벼 생육과 논 담수 중 양분 농도를 조사하여 벼 수량과 비점오염 저감을 위한 합리적인 액비 시용 방법을 제안하기 위해 수행되었다. 고농도 액비(MH)와 저농도(ML) 액비를 질소 기준 표준시비량(LS)과 2배(LD) 시비량으로 2가지 방식(5:3:2, 2:4:4)으로 분시하여 벼를 재배하였고, 벼 재배기간 중 주기적으로 담수 농도를 채취하여 분석하였다. 벼 수량은 MLLDS244(570.3 g m-2)와 MLLSS532(538.1 g m-2)가 SF(574.7 g m-2)와 유사하였지만, MLLDS244는 담수 중 평균 T-N, T-P, TOC, COD 농도가 각각 43.2, 0.4, 20.5, 8.7 mg L-1로 MLLSS532(각각 19.2, 0.2, 18.0, 7.4 mg L-1)로 높았다. 한편, 담수 중수질항목 농도가 낮은 MHLS 처리구의 벼 수량은 MHLSS532와 MHLSS244에서 각각 374.9과 204.7 gm-2으로 저조하였다. 따라서, 벼 수량과 담수 중 수질 항목 지표를 모두 고려하면 저농도 액비를 표준시비량 수준에서 5:3:2(기비:1차 추비:2차 추비)로 분시하는 것(처리명: MLLSS532)이 최적 액비시용 방법으로 나타났다. 하지만, 액비에 함유된 유기탄소에 의해 TOC와 COD 농도 상승 가능성이 있는 점을 충분히 고려해야 할 필요가 있다.
구두발표(OA)-농업환경 및 토양,수질 분야 : CO2, 온도, 수분 및 양분 조건에 따른 소나무 엽의 화학성 변화
박현진 ( Hyun Jin Park ),이광승 ( Kwang Seung Lee ),전병준 ( Byeong Jun Jeon ),함종현 ( Jong Hyun Ham ),이세인 ( Se In Lee ),임상선 ( Sang Sun Lim ),최우정 ( Woo Jung Choi ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
As tree litters are an important organic matter source in forest ecosystem, decomposition characteristics of litter direct affect soil C storage of the forest ecosystem. This study was conducted to investigate the effects of multiple environmental variables including atmospheric CO2 concentration ([CO2]), temperature (T), and soil water (W) and nutrient (N) availability of the chemistry of pine ( Pinus densiflora) needles. Pine seedlings were grown under different [CO2], T, and soil W and N conditions, and the needle samples were collected and analyzed for C/N and lignin contents. The C/N ratios were significantly ( P<0.05) affected the four treatments with or without significant interaction between them. Overall, elevated [CO2] increased C/N ratio probably due to more C gain through photosynthesis using a unit N. However, when N and W are limited, the C/N was not increased by elevated [CO2], indicating “CO2 fertilization effect” is not realized when soil resources are limited. In ambient [CO2], increases in T resulted in a decrease in C/N probably reflecting N supply from soil N via enhanced organic matter decomposition under elevated T. However, in elevated [CO2], the effects of increased T were more complicated being affected by soil resources availability. In ambient [CO2], high N availability decreased C/N ratio; whereas, in elevated [CO2], such effect was not consistent through soil W and N treatments. Our study suggests that the change in tree leaves chemistry should be interpreted with full consideration of multiple environment variables.
토양환경 분야PS-05 : 수질 시료 용존유기탄소의 탄소동위원소비 분석 방법: 알칼린 과황산 산화법과 동결건조 연소법 비교
전병준 ( Byeong Jun Jeon ),함종현 ( Jong Hyun Ham ),임상선 ( Sang Sun Lim ),이광승 ( Kwang Seung Lee ),이세인 ( Se In Lee ),박현진 ( Hyun Jin Park ),유서진 ( Seo Jin Yu ),이상모 ( Sang Mo Lee ),박용세 ( Yong Se Park ),윤광식 ( Kwa 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
Dissolved organic carbon (DOC) is a key parameter of water quality assessment as DOC is directly associated with biological oxygen demand (BOD). Carbon isotope composition (δ13C) of DOC can be used as an indicator of the DOC sources since organic materials have distinguished δ13C values affected by their source; for example C3 vs. C4. In this study, we compared two methods (alkaline persulfate oxidation and freeze drying-combustion). For the alkaline persulfate oxidation method, glucose (-12.0‰) was used as a standard material. Glucose solution (10 mg L-1) was oxidized with alkaline persulfate (10 mL) in the presence of SrCl2 (for precipitation of CO2) under a variety experimental conditions, and then the precipitates (SrCO3) were analyzed for δ13C. The measured δ13C were -25∼-17‰ and thus the precision and reproducibility were not satisfied. For the freeze drying-combustion method, five reference materials (-23.3∼-12.0‰) were prepared by mixing glucose (-12.0‰) and compost extracts (-23.3‰). The solutions (150 mL) containing the reference materials were freeze-dried after addition of 700 mg of K2SO4 (for increasing quantity) and then the powder was analyzed for δ13C. There was a linear relationship (y=1.1328x + 6.7348, r2=0.98, P<0.001) between the calculated values (y) and measured values (x). Therefore, our study suggests that freeze drying-combustion can produce more reliable δ13C measurement compared to the conventional alkaline persulfate oxidation method.