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2020년도 우리나라 공업단지 인근 농경지의 중금속 함량 평가
정하일(Ha-il Jung),채미진(Mi-Jin Chae),김혁수(Hyuck-Soo Kim),김성철(Seong-Chool Kim),김기인(Ki In Kim),김권래(Kwon-Rae Kim),이미나(Mi-Na Lee),이태구(Tae-Gu Lee),전상호(Sangho Jeon),김명숙(Myung-Sook Kim) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
2020년도에 조사된 취약농경지(공업단지 인근 농경지) 토양 중금속 모니터링은 강원, 충남, 전남, 경남 지역에서 각도별 15개 공업단지 인근 농경지 토양에 대하여 150지점을 정점으로 지정하고, 총 600지점(표토, 심토)을 대상으로 8종 중금속(Cd, Cu, Pb, Zn, Ni, As, Hg, Cr) 함량을 조사하여 비교‧분석하였다. 토양 중금속 함량은 토양오염공정시험방법에 의거한 전함량 분석법에 따라 조사되었고, 토양화학성 7종(pH, EC, OM, Avail. P₂O<SUB>5</SUB>, Exch. K, Ca, Mg)을 토양화학분석법에 따라 분석하였다. 공업단지 인근 농경지 토양의 중금속 평균함량은 Cd 0.45, Cu 19.1, Pb 16.4, Zn 92.9, Ni 17.1, Cr 44.5, As 6.54, Hg 0.044 mg kg<SUP>-1</SUP>으로 우리나라 논 토양과 비교하여 Pb을 제외하고, 그 외 7종 중금속 모두에서 다소 높은 함량을 나타내었다. 토양환경보전법의 토양오염기준과 비교한 최고함량의 경우, Cu, Zn, As 성분들이 토양오염 우려기준을 초과한 것으로 나타났으며, 조사된 공업단지 인근 농경지의 시료채취 지점으로 부터 반경 3 km 내에 광산 및 폐광산이 위치한 것으로 판단됨으로 오염원 파악을 위한 확대 정밀조사가 필요한 것으로 판단된다. 또한 토양 중금속 함량수준별 분포비율은 Hg 성분이 우려기준의 1/20 농도 이하, Zn와 As 성분이 1/5 농도 이상에서 높은 분포비율을 차지하고 있었다. 토양오염 우려기준을 허용한계값으로 계산한 공업단지 인근 토양의 중금속 오염지수는 0.60(0.11∼3.15)으로 2020년도가 2019년도 이전보다 상대적으로 높은 값을 보였으며, Zn에서 1.0을 초과하는 지점들이 다수 조사되었다. 토양화학성분의 평균값은 pH 6.8, 염농도 1.2 dS m<SUP>-1</SUP>, 유기물 34.7 g kg<SUP>-1</SUP>, 유효인산 892.2 mg kg<SUP>-1</SUP> 이었고, 교환성 양이온인 칼륨, 칼슘 및 마그네슘 함량은 각각 1.5, 8.3, 2.0 cmol<SUB>c</SUB> kg<SUP>-1</SUP>으로 나타났다. 이상의 토양화학성 결과를 일반 논 토양의 적정기준과 비교해 볼 때, pH, 유기물 및 유효인산은 약간 낮았지만, 그 외 다른 성분들은 유의적인 차이가 없었다. 토양 중의 화학성분의 최소값과 최대값 간에는 큰 편차를 나타냈으며, 특히 pH 및 교환성 칼슘의 경우, 논 토양의 적정함량 범위보다 매우 높은 수준이었다. 이는 공업단지 인근 중금속 오염 농경지에 대한 개량대책으로 석회를 과량 시용한 것이 하나의 원인이 될 수 있을 것으로 판단된다.
Changes of Growth Responses, Yields, and Soil Nutrients in Arsenic-exposed Rice
Ha-il Jung(정하일),Mi-Jin Chae(채미진),Tae-Gu Lee(이태구),Sangho Jeon(전상호),Myung-Sook Kim(김명숙) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Arsenic (As) contamination in agricultural soils causes adversly influences crop growth and yield, and serious human health problems. The objectives of this study were to (a) verify the change of chemical properties under As-exposed soils, (b) compare the growth, yield, and soil nutrients of untreated and As-treated rice plants, and (c) investigate the relationship between As total and phytoavailable As concentrations in the soil and As concentrations accumulated in the polished rice. Rice plants were cultivated in a greenhouse under six As concentrations: 6 (control), 25, 34, 42, 50, and 59 mg kg<SUP>-1</SUP>. A significant positive correlation was found between As concentration and NH₄-N, available P₂O<SUB>5</SUB>, and exchangeable K. A significant negative correlation was indicated between As concentration and NO₃-N, whereas no difference was found in total N. As treatment decreased plant heights and number of tillers; caused yield reduction depending on the increasing As concentrations in soils. The yield of As-exposed rice plants was 38-90% less than that of untreated plants. This was mainly due to reduced number of panicles per plant and spikelets per panicle. We also found that total and phytoavailable As concentrations in the soil for the edible limiting concentration of As in polished rice (0.2 mg kg<SUP>-1</SUP>) were 21.851 and 1.035 mg kg<SUP>-1</SUP>, respectively.
정하일 ( Ha-il Jung ),김유학 ( Yoo-hak Kim ),공명석 ( Myung-suk Kong ),채미진 ( Mi-jin Chae ),강성수 ( Seong-soo Kang ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
Cadmium reduces the photosynthetic efficiency and disrupts metabolic reactions in a concentration-dependent manner. Moreover, by replacing the metal ions in metalloproteins that use essential metal ions, such as Cu, Zn, Mn, and Fe, as co-factors, heavy metals finally lead to the formation of reactive oxygen species (ROS) and alteration of antioxidant activities. These, in turn, cause destruction of the cellular membrane through lipid peroxidation of the plant, and ultimately cause the plants to necrosis. Therefore, this research was to elucidate the physiological responses of rice seedlings to cadmium (Cd) toxicity and the effect of sulfur (S) treatment on ROS and antioxidant changes. In order to confirm the level of physiological inhibition caused by Cd toxicity, hydroponically grown rice (cv. Dongjin) plants were exposed with 0 or 30 μM Cd (CdCl2) with or without 3 mM sulfur (S, K2SO4) at 4-leaf stage, and then investigated the contents of malondialdehyde (MDA) and H2O2 after 14 days. MDA and H2O2 contents in shoot and root were more increased in S-untreated seedlings than S-treated ones. Fourteen days after treatment with 30 μM Cd, plant height showed no significant difference between S-treated and -untreated control, with both showing an identical reduction. However, it was observed that Cd caused a more decline than Cd with S for shoot fresh weight. The largest amounts of Cd were found in the roots and also observed a large amount of transport to the stem. Interestingly, in terms of Cd transfer to the shoot parts of the plant, it was a little transported to leaves. However, we observed that Cd was transferred to a less level in S-treated seedlings than in untreated ones. Cd decreased glutathione (GSH) and ascorbate (AsA) contents in both roots and leaves but Cd treatment caused no change in GSH contents in the stem. Based on these results, it is thought that Cd toxicity causes an increase in lipid peroxidation and antioxidant changes. This in turn leads to damage to the conductive tissue connecting the roots, stem, and leaves, which results in a reduction in water content and causes several physiological changes including antioxidative systems. Therefore, future research in association with essential metal ions will be required, in order to elucidate the detoxification mechanisms of plants and to maintain homeostasis of antioxidative systems in the presence of Cd.
유채 식물체 내로의 카드뮴 이행과 산화스트레스 경감에 미치는 아스코베이트 효과구명
정하일 ( Ha-il Jung ),채미진 ( Mi-jin Chae ),이은진 ( Eun-jin Lee ),이태구 ( Tae-gu Lee ),김명숙 ( Myung-sook Kim ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
The role of ascorbate (AsA) in antioxidant defense system-associated resistance to cadmium (Cd) in oilseed rape plants is not clearly demonstrated until recent study. The present study investigated the critical role of exogenous AsA on the biochemical responses of reactive oxygen species (ROS) and antioxidant levels in oilseed rape (Brassica napus L. cv. Tammi) seedlings exposed to Cd. Cadmium (10 uM) alone treatment led to significant reductions in plant growth; increase the level of superoxide, hydrogen peroxide, and malondialdehyde; and increase the uptake and accumulation of Cd by the roots and shoots in hydroponically grown 10-day-old seedlings. Moreover, it reduced AsA content and AsA redox ratios, which have been correlated with the reduction in glutathione (GSH) and/or nicotinamide adenine dinucleotide phosphate (NADPH) redox status. However, the exogenous AsA application to Cd-exposed seedlings decreased Cd-induced ROS, improved antioxidant defense systems by increasing AsA, GSH, and NADPH contents, and increased Cd uptake and accumulation in both roots to shoots of the plants. These results proved that the enhancement in AsA redox status can be linked to an increase in the GSH and/or NADPH redox ratios through induction of the AsA-GSH-NADPH cycle. Thus, these results suggest that exogenous AsA application to oilseed rape seedlings under Cd stress alleviates the overall Cd toxicity by regulating the homeostasis of the AsA-GSH-NADPH cycle, which re-establish the cellular redox status.