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| Effects of biochar on Cd bioavailability in rhizosphere microenvironment of cadmium-polluted paddy and Cd content in rice |
| Received:October 26, 2016 |
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| KeyWord:biochar;rice;rhizosphere microenvironment;Cd;bioavailability |
| Author Name | Affiliation | E-mail | | ZHANG Li | College of Resource and Environment, Northeast Agricultural University, Haerbin 150000, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | HOU Meng-yao | College of Resource and Environment, Northeast Agricultural University, Haerbin 150000, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | AN Yi | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LI Yu-jin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIN Da-song | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | lindasong608@126.com | | ZHU Dan-mei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | QIN Li | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | HUO Li-li | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | |
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| Abstract: |
| Rhizobox training experiments were performed to investigate the role of biochar on the pH, Cd bioavailability in rhizosphere and non-rhizosphere soil and the accumulation of Cd in different parts of rice plants. Results showed that the soil pH value has a rising trend with the increasing proportion of biochar. The available forms of Cd were declined under different dosages of biochar in rhizosphere and non-rhizosphere soil, with the maximum reduction of 13.9% under the treatment of 50 g·kg-1 biochar in rhizosphere soil. Cd concentrations in the first and second layer in non-rhizosphere soil were significant decreased under the dosage of 100 g·kg-1 biochar, resulting in 27.4% and 22.9% reduction, respectively in contrast to the control, but for available Cd concentration in the third layer of non-rhizosphere soil, it was significantly declined under the middle dosage of 50 g·kg-1 biochar, and decreased by 29.2 compared with CK. The application of biochar reduced Cd accumulation in different parts of rice. There was a significant difference(P<0.05) in root and rice under the content of 50 g·kg-1 biochar compared with control treatments, and dropped by 49.8% and 81.2% respectively. The maximum reduction of 28.2% and 47.1% in Cd concentrations in the leaf and rice husk was got under the dosage of 100 g·kg-1 and 50 g·kg-1, respectively. It was observed that application of a certain amount of biochar can improve pH value of soil, and reduce the bioavailability of Cd in soil and Cd absorption in rice. |
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