• Effects of Humic Acids on Growth of Herbaceous Plants in Soil Contaminated with High Concentration of Petroleum Hydrocarbons and Heavy Metals
  • Kim, Ki-Seob;Sung, Ki-June;
  • Department of Ecological Engineering, Pukyong National University;Department of Ecological Engineering, Pukyong National University;
  • 고농도 유류와 중금속으로 복합 오염된 토양에서 식물성장에 미치는 부식산의 영향
  • 김기섭;성기준;
  • 부경대학교 생태공학과;부경대학교 생태공학과;
Abstract
Germination tests were conducted to determine the practical concentration levels at which plants can reproduce naturally during the phytoremediation of soils contaminated with a high concentration of petroleum hydrocarbons and heavy metals. The effects of humic acids on plant growth and soil physicochemical properties were also investigated. The results show that phytoremediation can be applied in soils contaminated by multiple contaminants at the former soil contamination potential level of Korean soil quality standards considering successful natural reproduction. It was observed that germination rates of Helianthus annuus and Festuca arundinacea were high after all treatments, and transplantation was more appropriate for Phragmites communis in phytoremediation. Humic acids had a positive effect on the growth of both aboveground and belowground biomass of herbaceous plants. Growth inhibition by multiple contaminants is more severe in the case of aboveground biomass. Germination and growth tests suggest that Helianthus annuus is a suitable phytoremediation plant for soils contaminated with a high concentration of petroleum hydrocarbons and heavy metals. The addition of humic acids also caused changes in the physicochemical properties of contaminated soils. An increase in the carbon and nitrogen content due to the addition of humic acids and a correlation between cation exchange capacity(CEC) and the organic matter content were observed.

Keywords: Phytoremediation;Co-contamination;Growth inhibition;Soil physicochemical properties;Natural reproduction;

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