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| Effects of biochar derived from corn-straw on cadmium bioavailability, and lettuce growth under cadmium stress |
| Received:November 08, 2020 |
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| KeyWord:corn-straw biochar;cadmium;isothermal adsorption;rhizotoxicity;bioavailability |
| Author Name | Affiliation | E-mail | | LI Ming | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | WANG Lei | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | FAN Ting-ting | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | SHI Jia-qi | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | GAO Shang | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | JI Tao | College of Environment, Hohai University, Nanjing 210098, China | | | WAN Jin-zhong | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | | | LONG Tao | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Key Laboratory of Soil Environmental Management and Pollution Control, Ministry of Ecology and Environment, Nanjing 210042, China | longtao@nies.org | | YUAN Xu-yin | College of Environment, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| In order to clarify the effects of corn-straw biochar application on cadmium（Cd）bioavailability and plant growth under Cd stress, 0% and 2%（m/V）corn-straw biochar were added to the simulated soil solutions in this study. At different pH values（4.3 and 7.0）, the adsorption behavior of Cd2+ on biochar was analyzed using isothermal adsorption experiments. The correlations between Cd bioavailability and its environmental behavior（as affected by biochar）were analyzed together with the data of growth, rhizotoxicity, and root Cd accumulation of lettuce seedlings（Lactuca sativa var. longifolia）. The negative charge of biochar increased with the increase in solution pH, and Cd2+ was adsorbed by corn-straw biochar through an electrostatic effect; the Langmuir equation fitted the adsorption behavior of Cd2+ by biochar optimally, and the maximum adsorption capacity（Qm）of Cd2+ predicted by the Langmuir equation increased with the increase of pH values. Root length, and dry weight of lettuce seedlings increased with the increasing rate of biochar application, while the content of Cd in the roots decreased with the application of biochar. When compared to the content of total Cd in simulated soil solutions （Cdtotal）, and Cd content in roots, the concentration of Cd2+ in solutions was more strongly correlated to relative root elongation RRE（r2= 0.80, P<0.001）, and dry weight（r2=0.88, P<0.001）. The application of corn-straw biochar could therefore effectively be used to reduce the bioavailability and ecological risks of heavy metals. |
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