title: [Phytoremediation of polychlorinated biphenyls contaminated soil by leguminosae-gramineae intercropping: a field trial].
abstract: Phytoremediation of polychlorinated biphenyls (PCBs) contaminated soil by leguminosae (alfalfa) and gramineae (ryegrass and tall fescue) was studied in a field trial. All planted treatments had significantly higher PCBs removal efficiency compared with those of unplanted control after 270 days of in-situ phytoremediation. Alfalfa monoculture received the highest removal efficiency of soil PCBs by 59.6%. Analysis of PCBs congeners composition showed that the percentage of di-chlorinated biphenyl decreased in all planted treatments. Alfalfa produced the maximum biomass among the 3 plants. Total PCBs concentration in alfalfa roots reached 355.1 microg/kg, which was significantly higher than those in ryegrass and tall fescue. The phytoextraction efficiency of different treatment was in order of alfalfa > alfalfa-ryegrass-tall fescue > alfalfa-ryegrass > ryegrass > alfalfa-tall fescue > tall fescue. The results suggest that alfalfa may be an ideal candidate for the phytoremediation of PCBs contaminated soil.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Sciecne, Chinese Academy of Sciences, Nanjing 210008, China. tchen@issas.ac.cn
authors.forename: Chen
authors.initials: C
authors.lastname: Tu
authors.forename: Ying
authors.initials: Y
authors.lastname: Teng
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Luo
authors.forename: Cheng
authors.initials: C
authors.lastname: Pan
authors.forename: Xiang-Hui
authors.initials: XH
authors.lastname: Sun
authors.forename: Zhen-Gao
authors.initials: ZG
authors.lastname: Li
mesh_terms: D000383:Agriculture / Q000379:methods; D001673:Biodegradation, Environmental; D031751:Festuca / Q000378:metabolism*; D008129:Lolium / Q000378:metabolism*; D000455:Medicago sativa / Q000378:metabolism*; D011078:Polychlorinated Biphenyls / Q000302:isolation & purification* / Q000378:metabolism; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls