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| A comprehensive evaluation of remediation effects on cadmium contamination in paddy fields based on soil quality |
| Received:December 03, 2020 |
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| KeyWord:amendment;Cd-contaminated paddy fields;remediation effect evaluation;soil quality;dynamic weighted comprehensive evaluation method |
| Author Name | Affiliation | E-mail | | LI Yi-chun | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | WANG Yan-hong | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | CHEN Yong | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | TANG Ming-deng | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | LI Qi | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | LI Lin-feng | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | | | LIN Xiao-yang | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | YIN Yi-long | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | AI Shao-ying | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China | ycli724@hotmail.com,aishaoying@gdaas.cn |
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| Abstract: |
| At present, it is overly important and urgent to carry out a comprehensive evaluation of the effects of some current remediation technologies against cadmium（Cd）contamination in paddy fields in China, which play a key role in promoting the control and remediation of soil pollution. In this study, a self-developed amendment was selected, and a field experiment was carried out in a rice-growing region in South China to investigate the effects of the amendment application on the soil environment, fertility, and health. Additionally, DTPA extractable Cd, organic matter, alkaline hydrolytic nitrogen, available phosphorus and potassium, cation exchange capacity（CEC）, brown rice Cd, and rice yield were selected to construct a comprehensive evaluation index system, which was used to comprehensively evaluate the remediation effect of the amendment application in Cd-contaminated paddy fields according to a dynamic weighted comprehensive evaluation method. The results showed that the concentrations of DTPA extractable Cd in treatments of 6 000 kg·hm-2 and 7 500 kg·hm-2 were reduced by 10.5% and 8.8% from the control treatment, respectively. The soil organic matter content in the 6 000 kg·hm-2 treatment decreased by 6.3% compared with the control. Amendment application did not significantly affect alkaline hydrolytic nitrogen and available phosphorus contents and CEC but significantly increased available potassium content. Application at a rate of 1 500 kg·hm-2 significantly increased brown rice Cd content by 23.9%. When the application rate was ≥4 500 kg·hm-2, brown rice Cd content was significantly lower than the National Food Safety Standard. Moreover, the remediation efficiency（RE）was more than 40%. The 4 500 kg·hm-2 treatment significantly elevated the rice yield, representing an 18.7% increase from the control treatment. The dynamic weighted comprehensive evaluation method’ s results showed that the comprehensive remediation effect of amendment application at a rate of 6 000 kg·hm-2 on Cdcontaminated paddy fields was optimal. |
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