Accumulation and phytoavailability of benzo[a]pyrene in an acid sandy soil |
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Authors: | Weiqin Xing Yongming Luo Longhua Wu Jing Song Peter Christie |
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Affiliation: | (1) Soil and Environmental Bioremediation Research Center, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China;(2) Agricultural and Environmental Science Department, Queen’s University Belfast, Newforge Lane, BT9 5PX Belfast, UK |
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Abstract: | Effects of benzo[a]pyrene (B[a]P) on ryegrass (Lolium perenne L.) growth, plant accumulation and dissipiation of B[a]P in a red sandy soil (Hapli-Udic Argosol) were studied in a pot experiment. The plants were grown for 61 days in soil spiked with B[a]P at 0, 12.5, 25 and 50 mg kg−1. Control pots without plants were also set up. Soil extractable B[a]P, plant shoot and root biomass, and concentrations of B[a]P in plant shoots and roots were determined. Ryegrass biomass was increased by addition of B[a]P and root B[a]P concentrations were significantly correlated with B[a]P application rate, but no such correlation was found for shoot B[a]P concentrations. This indicates that B[a]P enhanced the growth of the ryegrass. The extractable B[a]P concentration in the planted soil was significantly lower than that in the unplanted control soil at the rate of 50 mg B[a]P kg−1. This indicates that ryegrass may help to dissipate B[a]P in soil at concentrations over 50 mg kg−1 soil although the mechanism for this is not understood. |
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Keywords: | acidic sandy soil PAHs phytoavailability polycyclic aromatic hydrocarbons ryegrass |
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