Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Effect of Biosolids on Heavy Metal Bioavailability and Organic Acid Production in Rhizosphere of Zea mays L.

Biosolid 처리가 옥수수 근권의 유기산 생성과 중금속 유효도에 미치는 영향

  • Received : 2005.04.06
  • Accepted : 2005.05.20
  • Published : 2005.08.30
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Abstract

A greenhouse experiment was conducted to evaluate the composition of organic acids on the bioavailability of heavy metals in the rhizosphere of corn (Zea mays L.) over 12 weeks after treatment of biosolids. After planting the plants were sampled at 12th week and analyzed for heavy metals in shoot and root and organic acids in the rhizosphere. Results showed that biomass yields of Zea mays L. grown on biosolids-treated media were significantly higher than those grown on standard media. The effect of biosolids on biomass yields of Zea mays L. was in order of Riverside ${\approx}$ Los Angeles ${\approx}$ MWRDGC > Milorganite > Nu-earth > standard media. Metal uptake by Zea mays L. was closely related with the contents contained on biosolids treated. In the plot treated with Nu-earth the uptake of Cd and Zn by shoot was significantly higher than those at the plots treated with other biosolids. The uptake patterns of Cd and Zn by root were similar to those of shoot. The uptake of Cr and Ni was significantly higher with application of Nu-earth over other biosolids. In all cases, the major organic acids in the rhizoshpere were lactic, acetic, propionic, butyric, and oxalic acids. Other organic acids were glutaric and succinic and occasionally, pyruvic and tartaric acids were also found. And the organic acid compositions did not vary significantly with the treatments of biosolids. Butyric and acetic acids were distinctively dominant both in the standard and the biosolids treatments.

Biosolid 처리는 옥수수의 생장을 촉진시켰으며 중금속 흡수 또한 현저히 증가시켰다. 특히 다른 biosolid와 비교하여 Nu-earth 처리에서 옥수수 지상부의 Cd과 Zn의 흡수가 많은 것으로 나타났다. 옥수수의 중금속 흡수는 biosolid 자체의 중금속 함량과 밀접하게 관련되었는데, 크롬과 납의 흡수는 그 중 상관관계가 가장 낮았다. 근권의 유기산은 주로 lactic acid, acetic acid, propionic acid, butyric acid 및 oxalic acid 인 것으로 나타났다. 그 외 glutaric acid와 succinic acid, pyruvic acid 및 tartaric acid도 일부 발견되었다. Biosolid를 처리한 경우에는 butyric acid가 가장 많았으며 처리하지 않은 경우에는 acetic acid가 가장 많았다.

Keywords

References

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