In recent years, heavy metal pollution in the soil has been a frequent problem in China, and the problem of heavy metals exceeding the standard in rice and wheat crops is also worrying. Therefore, the prevention and remediation of soil heavy metal pollution needs to be strengthened.
There are many foreign work on the investigation of large-scale pollution conditions and cause analysis, and the use of portable heavy metal detectors for long-term dynamic monitoring. In recent years, China has also conducted several large-scale pollution surveys and conducted detailed investigations of soil pollution. However, it still lacks authoritative source list of soil and food crops based on historical big data and source analytical techniques. Soil and food crops The comprehensive analysis of heavy metal content and the work on model simulation also need to be strengthened.
At present, most of the relevant research work is limited to the pot experiment or field plot test, and the control conditions are quite different from the actual production environment and production operation in Daejeon. Because of the lack of large data volume and multivariate monitoring and analysis, it is difficult to perform statistical correlation analysis between the national soil pollution survey results and the food crops with heavy metals exceeding the standard. In particular, the spatially quantitative relationship between the two is unclear. The soil pollution monitoring results may be consistent with the food crop pollution assessment results. There may also be phenomena where the heavy metals in the soil exceed the standards and the corresponding heavy metals do not exceed the standard, or the heavy metals in the crops where the soil heavy metals do not exceed the standards exceed the standard. At present, the academic community pays more attention to soil pollution problems, but there are relatively few studies on the heavy metal pollution in the soil-grain crop system and the quantitative relationship between the two.
Nowadays, what needs to be done is to focus on the characteristics of mild to heavy metal-contaminated farmland in China, and adhere to the principle of prevention, priority protection, management and control, repair supplementation, demonstration guidance, and adaptation to local conditions. The development of portable heavy metal detectors for field testing is By means of measures to strengthen the support and repair and restoration of technical support, a farmland soil pollution control management system consisting of laws and regulations, standards systems, management systems, public participation, scientific research, and public education will be formed.
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