Remediation aspect of microbial changes of plant rhizosphere in mercury contaminated soil |
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Authors: | Aleksandra Sas-Nowosielska Regina Galimska-Stypa Rafa? Kucharski Urszula Zielonka Eugeniusz Ma?kowski Laymon Gray |
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Institution: | (1) Institute for Ecology of Industrial Areas, Kossutha Str.6, 40-033 Katowice, Poland;(2) Department of Microbiology, University of Silesia, Katowice, Poland;(3) Department of Plant Physiology, University of Silesia, Katowice, Poland;(4) Florida State University, Tallahassee, USA |
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Abstract: | Phytoremediation, an approach that uses plants to remediate contaminated soil through degradation, stabilization or accumulation,
may provide an efficient solution to some mercury contamination problems. This paper presents growth chamber experiments that
tested the ability of plant species to stabilize mercury in soil. Several indigenous herbaceous species and Salix viminalis were grown in soil collected from a mercury-contaminated site in southern Poland. The uptake and distribution of mercury
by these plants were investigated, and the growth and vitality of the plants through a part of one vegetative cycle were assessed.
The highest concentrations of mercury were found at the roots, but translocation to the aerial part also occurred. Most of
the plant species tested displayed good growth on mercury contaminated soil and sustained a rich microbial population in the
rhizosphere. The microbial populations of root-free soil and rhizosphere soil from all species were also examined. An inverse
correlation between the number of sulfur amino acid decomposing bacteria and root mercury content was observed. These results
indicate the potential for using some species of plants to treat mercury contaminated soil through stabilization rather than
extraction. The present investigation proposes a practical cost-effective temporary solution for phytostabilization of soil
with moderate mercury contamination as well as the basis for plant selection. |
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Keywords: | Mercury Phytostabilization Metal uptake Rhizosphere Microbial population |
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