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| Ability of herbaceous plants to remove heavy metals from non-point sources of pollution in riparian buffer zones |
| Received:April 15, 2017 |
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| KeyWord:herbs;heavy metals;micropollutants;purification ability;riparian buffer zone |
| Author Name | Affiliation | E-mail | | CHEN Dong-xia | School of Forestry, Northeast Forestry University, Harbin 150040, China | | | LIU Hong-wei | School of Forestry, Northeast Forestry University, Harbin 150040, China | | | LIANG Hong | School of Forestry, Northeast Forestry University, Harbin 150040, China
School of Environment, Harbin Institute of Technology, Harbin 150090, China | | | SHEN Hai-long | School of Forestry, Northeast Forestry University, Harbin 150040, China | | | GAO Da-wen | School of Forestry, Northeast Forestry University, Harbin 150040, China
School of Environment, Harbin Institute of Technology, Harbin 150090, China | dawengao@gmail.com |
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| Abstract: |
| To study the ability of herbaceous plants to remove heavy metal micropollutants in the northeastern region of China, Medicago sativa, Poapretensis, and Lolium perenne were selected. The ability of these three species to remove Cu, Cd, and Pb was studied using hydroponic experiments. The results showed that each of these three herbs displayed the ability to remove Cu, Cd and Pb. The removal rate of Cu and Pb increased with increasing exposure levels, while the removal rate of Cd decreased with increasing exposure levels for all three herbs. The removal efficiencies of Cu, Cd and Pb from synthetic rainwater were different for different stages of growth. Lolium perenne had a highest removal rates at the growth stage, with a removal efficiency of Cu, Cd and Pb up to 56.85%, 63.72%, and 55.03%, respectively. Medicago sativa had the highest removal rate at the seedling stage, with a removal efficiency of Cu, Cd and Pb up to 41.98%, 45.37%, and 68.41%, respectively. Poapretensis also had the highest removal rate in the growth stage, with a removal efficiency of Cu, Cd and Pb up to 51.25%, 33.83%, and 26.55%, respectively. These results demonstrate that these three species may be used as alternative herbaceous plants for riparian buffer zones. |
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