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| Heavy-metal pollution and safety production technologies of soil-vegetable crop systems in China |
| Received:June 15, 2018 Revised:September 25, 2018 |
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| KeyWord:cadmium (Cd);lead (Pb);mercury (Hg);arsenic (As);variety screening;water and fertilizer management;passivation agent;leaf surface resistance control agent;bioavailability |
| Author Name | Affiliation | | FENG Ying | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | MA Lu-yao | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | WANG Qiong | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | WU Ying-jie | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | HUANG Lu-kuan | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | ZHOU Qi-yao | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | YANG Xiao-e | Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China |
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| Abstract: |
| In recent years, there have been great breakthroughs in safe utilization technologies for heavy-metal polluted farmlands. However, there are few studies on the coupling of these key technologies with traditional highly intensive vegetable planting patterns. There are also few reports on their large-scale popularization and application. Therefore, in this work, based on the latest literature, the heavy-metal pollution status of the soil-vegetable crop system in China, the characteristics of heavy-metal uptake and accumulation in vegetable crops, and the research progress of comprehensive agronomic regulation technologies for safe production of heavy-metal contaminated vegetable fields are summarized. Presently, the heavy-metal pollution of vegetable soils in China is mild and moderate, but the regional differentiation is pronounced. The phenomenon of heavy metals exceeding food-safety standards in vegetable crops has been found nationwide and has brought great harm to both the vegetable industry and human health. The ability of vegetable crops to accumulate heavy metals varies by species, variety, and tissue parts. It is also restricted to certain genotypes, soil features, chemical properties, and other environmental conditions. Comprehensive agronomic regulation technologies, such as adjusting planting layout, screening low heavy-metal accumulation varieties, utilizing reasonable round-planting and intercropping, applying soil amendments and passivators, and optimizing water and fertilizer management are important methods of achieving safe utilization of mild heavy-metal pollution. In the future, studies on the transport and translocation of heavy metals in the soil-vegetable system will be still needed. Studies on the technical standards for safe production, planting -pattern coupling with comprehensive agronomic regulation technologies,, long-term positioning tests, and risk assessments should be strengthened to realize the safe utilization of heavy-metal contaminated vegetable fields and the safe production of agricultural products. |
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