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| Effects of chicken manure-derived biochar on Cu and Zn speciation in soil and uptake by plant |
| Received:March 24, 2018 Revised:May 09, 2018 |
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| KeyWord:chicken manure-derived biochar;available copper;available zinc;chernozem;deer manure;bok choy |
| Author Name | Affiliation | E-mail | | ZHANG Yi-teng | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | FAN Yu-bo | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | XU Xiao-tian | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | ZHANG Xiu-fang | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Ming-tang | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | limtdoc2008@163.com |
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| Abstract: |
| The chicken manure-derived biochar at 300℃ can immobilize carbon and heavy metals, and decrease the environmental problems caused by improper treatment of chicken manure. However, with the higher content of Cu and Zn in chicken manure, there may be a potential risk of heavy metal pollution owing to the use of biochar. Soil culture and pot experiments using bok choy (Brassica chinensis) in a greenhouse were performed to investigate the effect of chicken manure-derived biochar on Cu and Zn speciation in soil and their uptake by plants. The results showed that the application of chicken manure-derived biochar significantly increased the pH of soil and reduced the content of available Cu in soil. The available Cu content increased by 6.19 mg·kg-1 by adding chicken manure-derived biochar to blank soil, whereas the increase of the available Cu content could be prevented by adding deer manure. With time, the proportions of acid-soluble and reducible Cu were reduced, and the proportion of residual Cu was increased owing to chicken manure-derived biochar addition. For all the treatments with biochar, the proportions of oxidizable and residual Zn in soil were increased. At high temperature and humidity, the application of 2% biochar promoted the growth of bok choy, increased the dry weight, reduced the content of Cu and Zn in the roots, and reduced the accumulation coefficient of Cu and Zn in the roots. In the second pot experiment, the application of biochar reduced the content of Cu and Zn in the stems and leaves of bok choy. These results indicate that the application of chicken manure-derived biochar would cause pollution risk in the short term, and that Zn would cause greater pollution risk than Cu. However, with time, biochar application can promote the growth of bok choy, reduce the release of Zn, and immobilize Cu and Zn. Eventually, the uptake of Cu and Zn by the plants is reduced. |
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