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| Effects of different biochar types on Cd and Zn uptake and accumulation by rice |
| Received:March 23, 2022 |
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| KeyWord:rice;cultivar;heavy metal;safe utilization;in-situ remediation;uptake;translocation |
| Author Name | Affiliation | E-mail | | SHEN Xiaogang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | | | ZHANG Afeng | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | zhangafeng@nwafu.edu.cn | | YE Xuezhu | Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | | | CHEN De | Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | chendeabcd@163.com | | ZHANG Qi | Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | | | ZHAO Shouping | Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | | | XIAO Wendan | Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Traceability for Agricultural Products, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China | | | WU Shaofu | Shaoxing Grain and Oil Crop Technology Extension Center, Shaoxing 312000, China | |
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| Abstract: |
| In order to screen biochars with good stabilizing capacity to soil Cd, a field experiment was performed to evaluate the effects of addition of different types of biochar, namely maize straw biochar（MSBC）, rice straw biochar（RSBC）, rice husk biochar（RHBC）, peanut husk biochar（PHBC）, cooking waste biochar（CWBC）, and wheat straw biochar（WSBC）, into soil on Cd and Zn uptake, translocation and accumulation in two rice varieties, including the hybrid cultivar‘Zheyou 18’（ZY-18）and the conventional cultivar‘Zhegeng 96’（ZG- 96）. The Cd content of ZY-18 was significantly higher than that of ZG-96, while the Zn content showed an opposite trend. The Cd/Zn ratio of ZY-18 was significantly higher than that of ZG-96. Biochar addition significantly reduced the Cd content of rice grains（29%-56%）in ZY-18 compared with control（no biochar addition）, with the greatest decrease recorded in the RSBC treatment. MSBC and WSBC addition decreased the Zn content of rice grains in ZY-18 grains by 18% and 16%, respectively. All biochar treatments, except WSBC, decreased the Cd/Zn ratio of rice grains by 28%-51% in ZY-18. There was no significant effects of biochar on Cd, Zn contents and the Cd/Zn ratio in grains of ZG-96. The Cd content of rice grains was significantly correlated with the root-to-shoot translocation factor of Cd（TFS/R-Cd）, while the Zn content of rice grains significantly correlated with the shoot-to-grain translocation factor of Zn（TFG/S-Zn）. The TFS/R-Cd of ZY-18 was 1.8-2.9 times that of ZG-96, while the TFG/S-Zn of the latter was 1.6-2.3 times that of the former. The TFS/R-Cd of ZY-18 decreased by 33% - 40%, but the TFG/S-Zn of ZG-96 increased by 38% - 57% following biochar addition. Soil available Cd and Zn decreased by respectively 38%- 91% and 53%- 96%, soil pH increased by 0.4-1.6 units, and soil organic matter content increased by 26% - 65% following biochar addition. Moreover, the contents of soil total nitrogen, alkali hydrolysable nitrogen, total phosphorus, and available phosphorus increased at varying degrees following biochar addition. Overall, the uptake and translocation of Cd and Zn differed across the cultivars, and their responses to biochar were also different. Biochar application significantly improved soil pH, organic matter content, and nutrient levels but reduced soil Cd availability, and thereby decreased the uptake and translocation of Cd and the Cd/Zn ratio of rice grains in ZY-18, with the best effects recorded under the RSBC treatment. |
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