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| Effects of Enterobacter sp. M5-biochar composite material on cadmium and arsenic accumulation in rice |
| Received:September 01, 2024 |
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| KeyWord:cadmium（Cd）;arsenic（As）;rice;sulfate reduction;magnetic coconut shell biochar |
| Author Name | Affiliation | E-mail | | LI Nan | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, China | | | LIU Yuling | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Academy of Agricultural Sciences, Institute of Agricultural Environment and Ecology of Hunan Province, Changsha 410125, China | | | ZHANG Puxin | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, China | | | YAO Junfan | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, China | | | YIN Xuefei | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Academy of Agricultural Sciences, Institute of Agricultural Environment and Ecology of Hunan Province, Changsha 410125, China | | | TIE Boqing | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, China | tiebq@qq.com |
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| Abstract: |
| This study was designed to investigate the impact of the Enterobacter sp. M5-biochar composite material on cadmium（Cd）and arsenic（As）accumulation in rice. We established six treatments using a pot experiment method, including Enterobacter sp. M5, biochar, and Enterobacter sp. M5-biochar composite material：control（CK）, Enterobacter sp. M5（M5）, coconut shell biochar（B）, magnetic coconut shell biochar（MB）, Enterobacter sp. M5-coconut shell biochar composite material（BM5）, and Enterobacter sp. M5-magnetic coconut shell biochar composite material（MBM5）. The results showed that the single and combined applications of Enterobacter sp. M5 and biochar could reduced Cd and As concentration of rice grains. The M5, MB, BM5, and MBM5 treatments resulted in rice contained levels of Cd and inorganic arsenic（IAs）that comply with national food safety standards. Compared to the treatments with single application of Enterobacter sp. M5 and biochar, Enterobacter sp. M5-biochar composite material were more effective in reducing the Cd and As contents in brown rice, husk and various parts of the plant, among which MBM5 treatment has the best effect on reducing the contents of Cd and As in rice, resulting in reductions Cd content in early and late rice grains by 25.49% and 74.00%, respectively, and decreases in As content by 39.83% and 30.95%, respectively. The BM5 and MBM5 treatments significantly increased the contents of Cd, As, S and Fe in root surface iron plaque, among which the contents of Cd, As, S and Fe in MBM5 treatment were increased by 171.82%, 139.94%, 72.52% and 140.20%, respectively. The B, MB, BM5, and MBM5 treatments significantly reduced the contents of available Cd and As in rhizosphere and non-rhizosphere soil. Enterobacter sp. M5-biochar composite material treatment improve the abundance and diversity of the microbial community, with the relative abundance of the Enterobacter genus increasing by 9.99, and 17.26 times in the BM5, and MBM5 treatments, respectively. Research indicate that the application of MBM5 was an effective method to simultaneously reduce the absorption and accumulation of Cd and As in rice. |
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