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| Effects of biochar application on cadmium transformation in brown soil and uptake by baby bokchoi |
| Received:December 13, 2016 |
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| KeyWord:biochar;Cd;transformation;bioaccumulation factor;translocation factor |
| Author Name | Affiliation | E-mail | | WANG Feng | 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, Shenyang 110866, China | | | WANG Meng-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, Shenyang 110866, China | | | XU Kun | 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, Shenyang 110866, China | | | DONG Xu | 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, Shenyang 110866, China | | | YU Na | 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, Shenyang 110866, China | | | ZHANG Yu-long | 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, Shenyang 110866, China | | | DANG Xiu-li | 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, Shenyang 110866, China | dangxiuli@163.com |
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| Abstract: |
| An incubation experiment was conducted to investigate the effects of biochar derived from rice husk on cadmium (Cd) transformation in brown soil. Biochar was applied at four rates (0, 1%, 3%, and 5% m/m) to the soil. The effect of biochar application on Cd uptake by baby bokchoi was studied by measuring the Cd contents underground and aboveground of baby bokchoi plants every 10 days in a pot experiment. The bioaccumulation factor of Cd underground and the translocation factor of Cd from underground to aboveground were also calculated. Results showed that the contents of the exchangeable fraction of Cd significantly decreased and the organically bound fraction of Cd significantly increased, with the increase of biochar application (P<0.05). Compared with no biochar addition, 3% and 5% biochar application increased the soil pH. There was negative correlation between soil pH and the exchangeable form of Cd (P<0.01). There was positive correlation between soil pH and the organically bound form of Cd, the Fe and Mn oxide bound forms of Cd, and the residual form of Cd (P<0.05). The Cd contents aboveground of the baby bokchoi plants for the 1%, 3%, and 5% biochar application decreased 8.86%, 64.22%, and 68.40%, respectively, compared with no biochar addition, and the Cd contents underground decreased 11.0%, 57.9%, and 60.6%, respectively. The Cd bioaccumulation factor underground decreased 0.01~1.26 and the Cd translocation factor from underground to aboveground decreased 0.22~0.32. Thus, 5% biochar application should be considered a suitable soil amendment for Cd. |
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