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| Effects of biochar application and water management coupling on cadmium transfer and accumulation in late-season rice |
| Received:December 22, 2019 |
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| KeyWord:rice;water management;biochar;cadmium content in brown rice;transport coefficient |
| Author Name | Affiliation | E-mail | | WANG Yi | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | WANG Bo-ran | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | ZHOU Wen-tao | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | ZHU Zhi-juan | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | LIU Li | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | ZHU Bo-wen | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | | | FU Zhi-qiang | College of Agriculture, Hunan Agricultural University, Changsha 410128, China
Scientific Observation and Experiment Station of Crop Cultivation in Central China, Ministry of Agriculture and Rural Areas, Changsha 410128, China | zqf_cis@126.com |
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| Abstract: |
| In the present study, rice fields with moderate cadmium pollution were selected and the late-rice variety ‘H You 518’ was used as test material to explore the effects of biochar and water management coupling on soil pH and cadmium absorption. Cadmium migration and accumulation in late rice were studied through field split-plot experiments. Four water management methods, namely pre-dry and post-flood(W1), pre-flood and post-dry(W2), long-term flood(W3), and conventional water management(W4), were the main treatments, and biochar with four gradients(C1-5 t·hm-2, C2-7.5 t·hm-2, C3-10 t·hm-2, and C4-0 t·hm-2)was used as the secondary treatments. The results showed that the pH values of all 16 treatments increased with 0.65~1.37 units, and the increase in W3-C3 was the largest, reaching 1.37 units. In each treatment, W3-C3 had the greatest effect on reducing the cadmium content in brown rice:Compared with the control(W4-C4), the cadmium content in brown rice was reduced by 59.10%, with a content of 0.18 mg·kg-1. In the same main treatment, the cadmium content in each organ showed a decreasing trend with increased carbon application. Each treatment could reduce the transport capacity of cadmium between rice organs. Compared with the control, the treatments with the largest decrease in the transport coefficient of cadmium absorbed by rice from root to brown rice and from stem and leaf to brown rice were W3-C3 and W3-C2, with decreases of 38.48% and 27.03%, respectively. After treatment, cadmium accumulation in brown rice decreased significantly, and the lowest accumulation was recorded for W3-C3, with a decrease of 53.44% compared with that of the control. In summary, the coupling of long-term flooding and biochar could effectively inhibit the absorption, migration, and accumulation of cadmium in late rice. Under long-term flooding, the effect of reducing cadmium was most obvious when the biochar application amount was 10 t·hm-2. |
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