Journal
ECOLOGICAL ENGINEERING
Volume 107, Issue -, Pages 56-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2017.06.052
Keywords
Phytoaccumulation; Hydrological regimes; Fe plaque; Radial oxygen loss; Wetland plant species; Rhizosphere
Funding
- National Natural Science Foundation of China [30570345, 41201312]
- Special Funding for Guangxi 'BaGui scholars' Construction Projects
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Wetland plants have been widely used in constructed wetlands to remove metal contaminants from water and soil. This study aimed to investigate radial oxygen loss (ROL) rate, metal (Pb, Zn, and Cd) uptake, Fe plaque formation, and their relationships in a pot trial with 10 emergent wetland plant species grown in metal-contaminated soil under flooded and non-flooded conditions. The results showed that biomass, ROL rates, metal (Pb, Zn, and Cd) uptake, and Fe plaque formation on root surfaces and in the rhizospheres of the wetland plant species were remarkably higher under flooded conditions than under non-flooded conditions. Generally, flooding mainly increased metal accumulation in the roots and Fe plaque on the root surface of wetland plant species. The wetland plant species with higher ROL rates had higher biomass, Fe plaque formation and metal adsorption on the roots and in the rhizospheres under flooded conditions. These results suggest the wetland plant species with higher ROL rates, biomass and metal accumulation ability, e.g. C. alternifolius, has the potential for use in phytoremediation of metal-contaminated wetlands. (C) 2017 Elsevier B.V. All rights reserved.
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