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Ruiz, E.; Alonso-Azcárate, J.; Rodríguez, L.
Environmental pollution (1987), 03/2011, Letnik: 159, Številka: 3Journal Article
The effect of the earthworm Lumbricus terrestris L. on metal availability in two mining soils was assessed by means of chemical extraction methods and a pot experiment using crop plants. Results from single and sequential extractions showed that L. terrestris had a slight effect on metal fractionation in the studied soils: only metals bound to the soil organic matter were significantly increased in some cases. However, we found that L. terrestris significantly increased root, shoot and total Pb and Zn concentrations in maize and barley for the soil with the highest concentrations of total and available metals. Specifically, shoot Pb concentration was increased by a factor of 7.5 and 3.9 for maize and barley, respectively, while shoot Zn concentration was increased by a factor of 3.7 and 1.7 for maize and barley, respectively. Our results demonstrated that earthworm activity increases the bioavailability of metals in soils. ► Lumbricus terrestris L. activity increases the bioavailability of metals in soils. ► Earthworm activity can significantly increase total, shoot and root metal concentrations for crop plants. ► Both bioassays and chemical extraction methods are necessary for assessing the bioavailability of metals in contaminated soils. Lumbricus terrestris L. activity increases the bioavailability of metals in soils and total, shoot and root metal concentrations for maize and barley.
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