title: Screening of plants for phytoremediation of oil-contaminated soil.
abstract: Several species of ornamental flowering plants were evaluated regarding their phytoremediation ability for the cleanup of oil-contaminated soil in Japanese environmental conditions. Thirty-three species of plants were grown in oil-contaminated soil, and Mimosa, Zinnia, Gazania, and cypress vine were selected for further assessment on the basis of their favorable initial growth. No significant difference was observed in the above-ground and under-ground dry matter weight of Gazania 180 days after sowing between contaminated and non-contaminated plots. However, the other 3 species of plants died by the 180th day, indicating that Gazania has an especially strong tolerance for oil-contaminated soil. The total petroleum hydrocarbon concentration of the soils in which the 4 species of plants were grown decreased by 45-49% by the 180th day. Compared to an irrigated plot, the dehydrogenase activity of the contaminated soil also increased significantly, indicating a phytoremediation effect by the 4 tested plants. Mimosa, Zinnia, and cypress vine all died by the 180th day after seeding, but the roots themselves became a source of nutrients for the soil microorganisms, which led to a phytoremediation effect by increase in the oil degradation activity. It has been indicated that Gazania is most appropriate for phytoremediation of oil-contaminated soil.
authors.affiliation: a Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University , Higashimita, Tama-ku, Kawasaki, Kanagawa , Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Ikeura
authors.affiliation: b Graduate School of Agriculture, Meiji University , Higashimita, Tama-ku, Kawasaki, Kanagawa , Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Kawasaki
authors.affiliation: c Department of Environmental Research and Development , Chugai-Technos Corp. , Yokogawasinmachi, Nishi-ku, Hiroshima, Hiroshima , Japan.
authors.forename: Etsuko
authors.initials: E
authors.lastname: Kaimi
authors.affiliation: d College of Agriculture, Ibaraki University , Chuo, Ami, Inashiki, Ibaraki , Japan.
authors.forename: Junko
authors.initials: J
authors.lastname: Nishiwaki
authors.affiliation: e School of Agriculture, Meiji University , Kurokawa, Asao-ku, Kawasaki, Kanagawa , Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Noborio
authors.affiliation: e School of Agriculture, Meiji University , Kurokawa, Asao-ku, Kawasaki, Kanagawa , Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tamaki
mesh_terms: D001673:Biodegradation, Environmental; D007564:Japan; D019684:Magnoliopsida / Q000378:metabolism; D010578:Petroleum / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D010578:Petroleum; D012989:Soil Pollutants
keywords: Gazania; dehydrogenase activity (DHA); phytoremediation; total petroleum hydrocarbon (TPH)