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| Effect of biochar on farmland soil and planting security of soybean in mining area |
| Received:February 27, 2018 |
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| KeyWord:safe cultivation;As;Pb;biochar;mining field restoration;soybean |
| Author Name | Affiliation | E-mail | | JIANG Shao-jun | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | | | LIU Jun-guang | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | | | LIU Ling-ling | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | | | LIU Yue-hong | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | | | HUANG Ren-long | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | | | SHU Yue-hong | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | hongershu@163.com |
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| Abstract: |
| Experiments were carried out to study the effects of lychee wood biochar addition(T1, 10 t·hm-2; T2, 20 t·hm-2; T3, 30 t·hm-2) on the safe cultivation of soybean in the acidic farmland soil of a mining area with moderate As and Pb pollution. The effects of biochar on soil physicochemical properties, and the content and speciation distribution of As and Pb were investigated.The impact of biochar addition on soybean production and uptake of As and Pb were also discussed. The results showed that the application of biochar significantly increased soil pH(P<0.01), and the content of soil CEC and organic matter(P<0.05),by 6.9%~21.4%, 0.7%~4.8%, and 21%~44%, respectively, compared with the control. With the increase in biochar addition, the total amount and ratio of bioavailable portion of As(except for T1) and Pb in soil decreased gradually. The addition of biochar significantly increased soybean yield with the highest obtained from T3, which increased soybean yield by of about 9.44 times that of the control. As and Pb uptake by soybean also decreased with biochar addition and T3 treatment might guarantee the safe cultivation of soybean in the tested soil. Overall, the results of this study provide a scientific basis for safe cultivation in a mining area. |
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