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| Study on main controlling factors of available cadmium variation in paddy soil after flooding in Changsha-Zhuzhou-Xiangtan area |
| Received:April 09, 2024 |
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| KeyWord:cadmium;gradient diffusion thin film（DGT）technology;stepwise regression model;Cubist model;release |
| Author Name | Affiliation | E-mail | | LÜ Danlei | Key Laboratory For Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Zhen | Institute of Agricultural Product Quality and Nutrition, Tianjin Academy of Agricultural Sciences, Tianjin 300191, China | | | ZHANG Chuangchuang | Key Laboratory For Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Wenjing | Key Laboratory For Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Tieliang | Key Laboratory For Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | JI Xionghui | Hunan Institute of Agricultural Environment and Ecology, Hunan 410125, China | | | ZHAO Yujie | Key Laboratory For Environmental Factor Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhaoyujie@126.com |
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| Abstract: |
| In Changsha-Zhuzhou-Xiangtan area of China, it is important to evaluate the mechanism of soil properties affecting soil available cadmium（Cd）. In this paper, gradient diffusion film（DGT）technology was used to explore the differences of Cd content in different soils after short-term flooding, and data mining methods such as stepwise regression and mixed linear regression（Cubist）were used to analyze the independent and combined effects of environmental factors controlling Cd release. The results showed that the variation of total Cd content in soil could explain 75% of the variation of Cd release, and other soil factors such as Fe and Mn oxides, organic matter, soil antagonistic cations（such as Cu）and pH had different effects on Cd release under different conditions. Cadmium in manganese binding state is more easily released into soil solution, which promotes the increase of Cd activity. High content of iron inhibits the activity of Cd, and iron-bound Cd is also released into the soil solution to form a part of available Cd. Due to the galvanic effect between Cu and Cd, the increase of Cu content promotes the release of Cd, but the effect is weak. The inhibition effect of organic matter on Cd release is reflected in the soil with high Cd content, the pH variability in the sampling area is weak, and the control effect on Cd release is easily masked by other related factors such as Mn. |
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