Method for simultaneous producing and repairing of mild cadmium contaminated soil

Abstract

The invention relates to the technical field of soil heavy metal pollution phytoremediation, and provides a method for simultaneous producing and repairing of mild cadmium contaminated soil. The method includes the steps of S1, successively sowing a variety of cadmium-rich plants with large plant height differences in the form of intercropping in soil with mild cadmium contamination according to seasons; S2, interplanting cucurbitaceae climbing herbaceous plants with low cadmium enrichment on the cadmium-rich plants, and picking at the time of fruit ripening; S3, timely conducting mowing and stubble remaining on the cadmium-rich plants, and removing all plants in the soil from roots between September and October; S4, detecting the cadmium content of the soil, if not qualified, repeating S1-S3 steps, carrying out the next batch of planting, and if qualified, stopping planting. The cadmium-enriched plants with high plant height differences are sown, the cucurbitaceae climbing herbaceousplants with the low cadmium enrichment is inter-planted thereon, and the above plants can effectively treat cadmium pollution in the soil due to the fact that there is no competition in the growth space, and can also bring economic income.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of soil heavy metal pollution, in particular to a method for production while repairing medium-light cadmium-contaminated soil. Background technique [0002] Soil cadmium pollution is one of the ten serious environmental problems facing society today. In nature, soil cadmium pollution has the characteristics of long decomposition period, high mobility, high toxicity, and refractory degradation. In my country, the cadmium-contaminated area of ​​farmland soil alone has exceeded 20×10 4 hm 2 , the annual production of agricultural products with excessive cadmium content reaches 14.6×10 8 kg. [0003] At present, the commonly used soil cadmium pollution remediation technologies mainly include physical remediation technology, chemical remediation technology and biological remediation technology (phytoremediation and microbial remediation, etc.). Among them, phytoremediation technology can...

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Problems solved by technology

[0004] However, there are still some difficulties in the practical application of phytoremediation technology, such as the hyperaccumulation plant species of heavy metals are few, the biomass is not large, the extraction rate is not high, and some plants have poor stress resistance in the field growth process. The management process is relatively complex, etc.

In addition, phytoremediation generally requires a long period of time, and most of the plants used for remediation do not have high agricultural utilization value, cannot bring a certain economic income to local farmers, and are not easily accepted by local farmers.

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