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| Effects of manganese application on the growth, cadmium uptake and cadmium distribution of maize in cadmium contaminated soil |
| Received:January 26, 2021 |
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| KeyWord:cadmium contamination;manganese;maize;soil remediation |
| Author Name | Affiliation | E-mail | | HU Yanmei | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | Lü Jinshuo | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | SUN Weibing | Shenyang Academy of Environmental Sciences, Shenyang 110167, China | | | ZHANG Xing | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | CHEN Lu | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | GUO Dawei | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | DANG Xiuli | College of Land and Environment, Shenyang Agricultural University, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Northeast Key Laboratory of Conservation and Improvement of Cultivated Land, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | dxl@syau.edu.cn |
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| Abstract: |
| To quantitatively analyze the remediation effect of manganese(Mn) on cadmium(Cd) contaminated soil, the effects of different concentrations of Mn(20, 200, 2 000 mg·kg-1) on Cd fractions in the soil, maize growth, Cd uptake by maize, and Cd subcellular distribution were studied by a pot experiment in low(5 mg·kg-1) and high(10 mg·kg-1) Cd contaminated brown soil. The results showed that:Mn application significantly changed the Cd fractions in the soil. Compared with the control, the concentration of exchangeable Cd decreased by 4.75%~30.81%, and the decreasing proportion of exchangeable Cd increased with increasing Cd concentration. Moderate Mn (20, 200 mg·kg-1) promoted the growth of maize roots, enhanced the biomass of all plant parts, and increased the yield by 11.42%~17.51%. However, excessive Mn(2 000 mg·kg-1) had a toxic effect on maize, resulting in yield reduction. The bioavailability of Cd in the soil was decreased by Mn application, and Cd uptake by maize was also inhibited. The Cd content in the grain in low and high Cd contaminated soil decreased by 46.15%~53.85% and 38.37%~52.33%, respectively. Meanwhile, Mn increased the Cd deposition in the cell wall and vacuolar compartmentation, promoted the fixation of Cd in the root, and reduced the transport of Cd to the shoot. In general, the passivation effect of Mn on low Cd contaminated soil is better than that in the high Cd contaminated soil, and an appropriate Mn application is more conducive to enhancing the growth and development of maize and reducing the Cd uptake. |
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