탑라이스 생산지역 논 토양 중 잔류중금속의 벼 흡수이행
Uptake and Translocation of Heavy Metals to Rice Plant on Paddy Soils in “Top-Rice” Cultivation Areas
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Heavy metal residues in soil, rice straw, unhulled rice, rice hull, polished rice, and rice barn on the rice paddy in the "Top rice production complex which is non-contaminated area were evaluated. It was observed that the average concentrations of As, Cd, Cu, Pb, and Hg in the paddy soils were 1.235, 0.094, 4.412, 4.728 and 0.0279 mg/kg, respectively. There were no cultivation areas exceeded of the threshold for soil contamination designated by "The Soil Environment Conservation Law" in Korea. For the polished rice, there were no samples exceeded of a permissible level of heavy metal residues such as 0.051 mg/kg of As, 0.040 mg/kg of Cd, 0.345 mg/kg of Cu, 0.065 mg/kg of Pb and 0.0015 mg/kg of Hg. For the uptake and translocation of heavy metals to rice plant, a main part of heavy metal accumulation was rice straw, and then rice bran. Furthermore, it shown that accumulation of heavy metals in unhulled rice, rice hulls, brown rice, and polished rice was approximately similar as low. The slopes of translocation of heavy metals from soil to polished rice were following order as Cd, 0.4321 > Cu, 0.054 ≒ Hg, 0.052 > As, 0.021 > Pb, 0.008. It was observed that potential ability of Cd uptake in rice plant and then its translocation into polished rice was very high. Concentrations of copper and mercury absorbed in the rice plant were moderate for translocating into the polished rice, while the arsenic and lead in the plant were scarcely translocated into the polished rice. The distribution of heavy metals absorbed and translocated into aboveground parts of rice plant was appeared that there were remained at 63.3-93.4% in rice straw, 6.6-36.9% in unhulled rice, 0.6-5.7% in rice hulls, 3.2-31.3% in brown rice, 0.8-4.6% in rice bran and 1.1-26.7% in polished rice. The accumulation ratio of Cd in the aboveground parts of rice plant was remained at 26.7-31.3% in brown and polished rice.
Abstract
Heavy metal residues in soil, rice straw, unhulled rice, rice hull, polished rice, and rice barn on the rice paddy in the "Top rice production complex which is non-contaminated area were evaluated. It was observed that the average concentrations of As, Cd, Cu, Pb, and Hg in the paddy soils were 1.235, 0.094, 4.412, 4.728 and 0.0279 mg/kg, respectively. There were no cultivation areas exceeded of the threshold for soil contamination designated by "The Soil Environment Conservation Law" in Korea. For the polished rice, there were no samples exceeded of a permissible level of heavy metal residues such as 0.051 mg/kg of As, 0.040 mg/kg of Cd, 0.345 mg/kg of Cu, 0.065 mg/kg of Pb and 0.0015 mg/kg of Hg. For the uptake and translocation of heavy metals to rice plant, a main part of heavy metal accumulation was rice straw, and then rice bran. Furthermore, it shown that accumulation of heavy metals in unhulled rice, rice hulls, brown rice, and polished rice was approximately similar as low. The slopes of translocation of heavy metals from soil to polished rice were following order as Cd, 0.4321 > Cu, 0.054 ≒ Hg, 0.052 > As, 0.021 > Pb, 0.008. It was observed that potential ability of Cd uptake in rice plant and then its translocation into polished rice was very high. Concentrations of copper and mercury absorbed in the rice plant were moderate for translocating into the polished rice, while the arsenic and lead in the plant were scarcely translocated into the polished rice. The distribution of heavy metals absorbed and translocated into aboveground parts of rice plant was appeared that there were remained at 63.3-93.4% in rice straw, 6.6-36.9% in unhulled rice, 0.6-5.7% in rice hulls, 3.2-31.3% in brown rice, 0.8-4.6% in rice bran and 1.1-26.7% in polished rice. The accumulation ratio of Cd in the aboveground parts of rice plant was remained at 26.7-31.3% in brown and polished rice.
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