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| Effects of pH,Eh,Fe,and flooded time on available-Cd content after flooding of different kinds of soil |
| Received:November 23, 2016 |
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| KeyWord:pH;Eh;Fe;available Cd;flooding |
| Author Name | Affiliation | E-mail | | ZHU Dan-mei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Yan | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHANG Li | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China | | | WANG Xiu-mei | 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 |
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| Abstract: |
| Based on collected and arranged data, the following variables were assessed after flooding:the trend in the change of soil pH values, Eh values, Fe(Fe(Ⅱ) and amorphous iron oxide) content, and available Cd content under different pH values in southern soil; the trend in the change of available Cd content in soil with different organic matter contents; and the effect of the trend in the change of pH, Eh, and Fe on the content of available Cd in soils. Several conclusions were drawn based on these analyses. All pH values tended to be neutral, the Eh decreased, and the Fe content increased in three kinds of soil with different pH values after 60 days of flooding. The content of available Cd in acid and neutral soils showed a continuous decreasing trend, decreasing 42% and 38%, respectively. In alkaline soil, it decreased 27%, and it increased on the first 15 days of flooding and then decreased gradually. In soil with different organic matter content after flooding, the content of available Cd in the soil with medium-high organic matter(≥ 20 g·kg-1) showed a continuous decreasing trend and decreased 78%. In the soil with medium-low organic matter(≤ 20 g·kg-1), it decreased 52% and increased on the flooded 15~30 days; the content of available Cd in the soil with the 15-day flooded treatment was lower than that for the 60-day treatment. After flooding, the content of available Cd in soil decreased with the increase in pH value, and the change rate was consistent; when the increase rate of the pH value increased, the decrease rate of the content of available Cd also increased, and vice versa. The content of available Cd in soil increased with the increase in the Fe content on the first 15 days of flooding, and then decreased with increase in Fe content. The content of available Cd decreased with the decrease in the Eh value during the flooding. In conclusion, the content of available Cd in soil could be effectively reduced in acid soil and medium-high organic soil after flooding. In alkaline soil, the available Cd content could only be reduced by flooding of not less than 30 days. In the medium-low organic soil, flooding should be conducted for less than 15 days in order to reduce the content of available Cd in soil. |
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