[Bioremediation of mineral oil and polycyclic aromatic hydrocarbons (PAHs) in soils with two plant species].
With alfalfa (Medicago sativa) and paddy rice as test plants, and with pollutant level, specific bacteria, fungi and organic fertilizer as control factors, the bioremediation of mineral oil and polycyclic aromatic hydrocarbons (PAHs) in soils with two plant species was conducted. The results showed that the degradation rate of mineral oil was promoted by fertilization in alfalfa soil, but not in paddy rice soil. The degradation rate of total PAHs (11 PAH listed in USEPA) was increased by fertilization both in alfalfa and in paddy rice soil, and the promotion effect of fertilizer was better in paddy rice soil than in alfalfa soil. The fertilization rate was positively related to the rhizospheric indigenous fungi and bacteria's CFU in alfalfa soil, but only to the indigenous bacteria's CFU in paddy rice soil. The fungi and bacteria's CFU in both test soils had no positive relation with the amount of specific bacteria and fungi spiked. The degradation rate of 3-ring PAHs was enhanced in both alfalfa and paddy rice soil by fertilization, and the effect was stronger in paddy rice soil than in alfalfa soil. However, fertilization had no positive effect on the degradation of 4-ring PAHs.
Song
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Y
Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016. songyufang@hotmail.com
Xu
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H
Ren
L
L
D001419:Bacteria / Q000378:metabolism; D017753:Ecosystem; D005658:Fungi / Q000378:metabolism; D029902:Medicago / Q000378:metabolism* / Q000502:physiology; D008899:Mineral Oil / Q000378:metabolism*; D012275:Oryza / Q000378:metabolism* / Q000502:physiology; D011084:Polycyclic Aromatic Hydrocarbons / Q000378:metabolism*; D012987:Soil; D012988:Soil Microbiology
D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D008899:Mineral Oil