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The Effect of Mycorrhizal Fungi on the Fate of Aldrin: Phytoremediation Potential

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The objective of this study was to investigate the phytoremediation potential of mycorrhizal systems for the remediation of aldrin-contaminated soils. Feltleaf willow ( Salix alaxensis ) and balsam poplar ( Populus balsamifera ) were grown in soil spiked with 0.8 mg/kg aldrin- (1,2,3,4,10- 14 C). Daconil 2787 ® was employed to suppress indigenous mycorrhizal infection. After 100 days of greenhouse incubation, mycorrhizal infection in the fungicide-amended willows was found to be 2.5 fold lower than in controls. Mycorrhizal infection in the poplar systems was unaffected by fungicide addition. Mycorrhizae were correlated with radiolabel uptake in the willow systems (r = 0.79), and not as strongly in the poplar systems (r = 0.58). Most of the radiolabel in the root material was bound product regardless of mycorrhizal infection, but 12 to 21% was found to be extractable dieldrin. Aldrin was not detected in any vegetative matrix. Dieldrin constituted less than 1% of the radiolabel in the willow leaf material, accumulating to approximately 5 μg/kg. Dieldrin was not detected in the poplar leaves (MDL ≈ 1 μg/kg), although the poplars took up approximately the same amount of radiolabel as the willows. Water-soluble transformation products were formed in the vegetated soils (6 to 12%) and nonvegetated controls (1 to 2%).
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Keywords: Populus balsamifera; Salix alaxensis; dieldrin; ectomycorrhizae; organochlorine pesticides

Document Type: Research Article

Affiliations: Department of Civil and Environmental Engineering, 248 Duckering University of Alaska Fairbanks, Fairbanks, AK, 99775-5900

Publication date: April 1, 2001

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