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Published in:
2010 | OriginalPaper | Chapter
Dynamics of Dissolved Organic Carbon in the Rhizosphere of Ryegrass (Lolium multiflorum L.) Induced by PCBs Pollution
Authors : Na Ding, Malik Tahir Hayat, Yan He, Haizhen Wang, Jianming Xu
Published in: Molecular Environmental Soil Science at the Interfaces in the Earth’s Critical Zone
Publisher: Springer Berlin Heidelberg
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The objective of this study was to examine ryegrass for phytoremediation of polychlorinated biphenyls (PCBs)-contaminated soils. A rhizobox was designed to allow the harvest of an intact layer of rhizosphere soil from plant root without the removal of the root material itself. Ryegrass was grown under controlled conditions in rhizobox for 45, 90 and 135 days. Results indicated that dissipation of PCBs in the rhizosphere were much higher at various layers compared to the no-plant control soils. The DOC concentrations suggested a trend over time. Dissolved organic carbon (DOC) concentrations at 45 days occurred as high as 11.63 mg·L
−1
in the rhizosphere, then decrease rapidly to 7.86 mg·L
−1
at 90 days after sowing. Finally, there was no significant change from 90 days to 135 days in DOC concentration. Moreover, dissipation rates of PCBs correlated positively with DOC concentrations at 45 days and 90 days after sowing. In this study, an average 6.8% loss of PCBs occurred due to the biotic activity without ryegrass planted.