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| Effects of biochar on the properties of soil lightly contaminated with lead in Southern Hunan and bioaccumulation and translocation of lead in rice plants |
| Received:August 11, 2017 Revised:December 01, 2017 |
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| KeyWord:soil;lead contamination;biochar derived from corn straw;rice;accumulation and translocation |
| Author Name | Affiliation | E-mail | | XU Ji-min | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | | | ZHANG Ping | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | zhyp2008@163.com | | LIAO Bo-han | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | | | GENG Qin | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | | | LI Qian | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | | | PENG Pei-qin | College of Environmental Science and Engineering, Central South University of Forestry and Technology
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China | |
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| Abstract: |
| The objective of the present study was to investigate the remediation effect of biochar derived from corn straw(BC) at application rates of 0, 0.5%, 1.0%, and 2.0% on the properties of lead-contaminated soil and bioaccumulation and translocation of lead in rice plants by means of a pot experiment. The results showed that application of BC increased soil pH values by 0.50~0.67, soil organic matter(OM) by 6.9%~25.1%, and soil cation exchange capacity(CEC) by 24.7%~41.3% and decreased contents of soil TCLP-extractable Pb by 4.4%~25.9%. The contents of soil TCLP-extractable Pb were found to have significant negative correlations with OM and with soil CEC values. When applying the same amount of BC, there were obvious differences in soil pH values, OM contents, soil CEC values, and contents of soil TCLP-extractable Pb between the rice seedling stage and the mature stage. At the rice seedling stage, soil pH values and OM were relatively higher; whereas at the rice mature stage, soil CEC values and contents of soil TCLP-extractable Pb were relatively higher. Among different rice parts, iron plaques accumulated the most Pb, and husks had the highest Pb-transferring capacity. The experiment indicated that applying BC increased Pb bioaccumulation in iron plaques and husks and decreased Pb contents in rice roots, straw, and brown rice. When the amounts of BC applied were higher than 1%, the Pb contents in brown rice were lower than 0.2 mg·kg-1, which met the safety standard in the National Food Standards(GB 2762-2017). It was obvious that BC could effectively ameliorate light Pb contaminated soil in the Southern Hunan mining area and significantly reduced Pb accumulation in brown rice. |
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