Method for restoring heavy-metal-contaminated soil by utilizing oil sunflower planting

Abstract

The invention discloses a method for restoring heavy-metal-contaminated soil by utilizing oil sunflower planting. The method comprises the following steps of planting oil sunflower in the heavy-metal-contaminated soil according to a natural growing period, and conventionally culturing the oil sunflower. The oil sunflower rapidly grows and has strong root systems, biomass of the overground part of oil sunflower is large, the oil sunflower is drought-resisting and barren-resisting property, has strong tolerance and enrichment property to heavy metal, can grow normally in the heavy-metal-contaminated soil and no obvious poison symptoms appear. The method provided by the invention has the advantages that the selected oil sunflower can absorb and accumulate a large quantity of multiple heavy metals, and particularly, the contents of heavy metals such as Cu, Pb, Cd and As in the plant reach a high enrichment level, and the problems in the existing heavy-metal-contaminated soil restoring technology that the plants slowly grow, the biomass is low, the total quantity of absorbed and accumulated heavy metals is small, the plants only have the tolerance and enrichment capacity to a single heavy metal, does not have the good economic benefits, and has poor practical application comprehensive result.

Description

technical field [0001] The invention relates to a phytoremediation technology for soil polluted by heavy metals, in particular to a method for repairing soil polluted by heavy metals by planting oil sunflowers. Background technique [0002] Phytoremediation of heavy metal-contaminated soil refers to removing, volatilizing or stabilizing heavy metal pollutants in the soil environment through plant systems and their roots, or reducing the toxicity of heavy metals in pollutants, in order to achieve the goal of removing pollution, repairing or treating soil. A technique for the purpose. For example, in 2003, Feng Ruotao used indoor cultivation of castor, sunflower, and corn seedlings to remove cadmium in water. The analysis showed that the stems and leaves of the seedlings had a very good effect on the accumulation of cadmium. Phytoremediation of cadmium-contaminated water in some traditional crop seedlings has good application prospects, so phytoremediation will be a major res...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for repairing heavy metal-contaminated soil by using oil sunflower planting to solve the problems of slow plant growth, low biomass and absorption The total amount of accumulated heavy metals is small, only a single heavy metal has resistance and enrichment ability, it does not have good economic benefits, and the actual application effect is poor. At the same time, safe edible oil can also be obtained by processing the harvested sunflower

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