Abstract
Purpose
A major challenge to phytoremediation of co-contaminated soils is developing strategies for efficient and simultaneous removal of multiple pollutants. A pot experiment was conducted to investigate the potential for enhanced phytoextraction of cadmium (Cd) by Sedum alfredii and dissipation of polycyclic aromatic hydrocarbons (PAHs) in co-contaminated soil by application of pig manure vermicompost (PMVC).
Materials and methods
Soil contaminated by Cd (5.53 mg kg−1 DW) was spiked with phenanthrene, anthracene, and pyrene together (250 mg kg−1 DW for each PAH). A pot experiment was conducted in a greenhouse with four treatments: (1) soil without plants and PMVC (Control), (2) soil planted with S. alfredii (Plant), (3) soil amended with PMVC at 5 % (w/w) (PMVC), and (4) treatment 2 + 3 (Plant + PMVC). After 90 days, shoot and root biomass of plants, Cd concentrations in plant and soil, and PAH concentrations in soil were determined. Abundance of PAH degraders in soil, soil bacterial community structure and diversity, and soil enzyme activities and microbial biomass carbon were measured.
Results and discussion
Application of PMVC to co-contaminated soil increased the shoot and root dry biomass of S. alfredii by 2.27- and 3.93-fold, respectively, and simultaneously increased Cd phytoextraction without inhibiting soil microbial population and enzyme activities. The highest dissipation rate of PAHs was observed in Plant + PMVC treatment. However, neither S. alfredii nor PMVC enhanced PAH dissipation when applied separately. Abundance of PAH degraders in soil was not significantly related to PAH dissipation rate. Plant + PMVC treatment significantly influenced the bacterial community structure. Enhanced PAH dissipation in the Plant + PMVC treatment could be due to the improvement of plant root growth, which may result in increased root exudates, and subsequently change bacterial community structure to be favorable for PAH dissipation.
Conclusions
This study demonstrated that remediation of Cd and PAHs co-contaminated soil by S. alfredii can be enhanced by simultaneous application of PMVC. Long-term evaluation of this strategy in co-contaminated field sites is needed.
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Acknowledgments
This study was financially supported by “863” Target Goal Projects from Ministry of Science of China (#2012AA101405-1; #2009AA06Z316), a key project from Ministry of Education of China (#310003), a project from Ministry of Environmental Protection of China (#2011467057) and Fundamental Research Funds for the Central Universities.
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Wang, K., Zhang, J., Zhu, Z. et al. Pig manure vermicompost (PMVC) can improve phytoremediation of Cd and PAHs co-contaminated soil by Sedum alfredii . J Soils Sediments 12, 1089–1099 (2012). https://doi.org/10.1007/s11368-012-0539-4
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DOI: https://doi.org/10.1007/s11368-012-0539-4