Method for repairing heavy metal-contaminated soil by using oilseed rape-oil sunflower crop rotation technology

Abstract

The invention relates to a plant restoration technology for heavy metal-contaminated soil, specifically to a method for repairing heavy metal-contaminated soil by using oilseed rape-oil sunflower crop rotation technology. The method overcomes the problems of seasonal restriction, slow growth, low biomass of an overground part, low total absorption and accumulation amount of heavy metals, tolerance and enrichment capability to only one single heavy metal, bad economic benefits and poor comprehensive effects in practical application of plants used in conventional heavy metal-contaminated soil restoration technology. According to the method provided by the invention, oilseed rape and oil sunflower are planted in soil contaminated by compound heavy metals according to the natural growing periods of the oilseed rape and the oil sunflower, and conventional cultivation is carried out; the oilseed rape and the oil sunflower both grow normally in the contaminated soil, no obvious symptom of toxicity appears, and the outputs of the oilseed rape and the oil sunflower are not affected; and since the biomass of the overground parts of the oilseed rape and the oil sunflower is great, a great amount of various heavy metals can be absorbed and accumulated, and in particular, the contents of Cu, Zn, Cd and Hg in the plants of the oilseed rape and the oil sunflower are obviously higher than soil background values, reaching an enrichment level.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, and relates to a method for remediating heavy metal pollution in soil by utilizing rapeseed-oil sunflower rotation technology. Background technique [0002] With the development of industry, the intensification of urban pollution and the continuous progress of agricultural production, the pollution of soil by heavy metals accompanied by exotic organic compounds has become increasingly serious (Pambrun V, Marquot A, Racault. Characterization of the toxic effects of cadmium and 3.5-dichlorophenol on nitrifying activity and mortality in biologically activated sludge systems-effect of low temperature [J]. Environ Science Pollution Resource. 2008, 15:592–599). At present, there are different degrees of heavy metal pollution in the soil of various countries in the world. The average annual emission of Hg is about 15,000 t, Cu is 3.4 million t, Pb is 5 million t, Mn is 15 million...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for remediating heavy metal pollution in soil using the rapeseed-oil sunflower rotation technology, so as to solve the problems of seasonal restrictions, slow growth, low biomass of aboveground parts, and total absorption and accumulation of heavy metals in the existing heavy metal contaminated soil remediation technology. The amount is small, it only has resistance and enrichment ability to a single heavy metal, it does not have good economic benefits, and the comprehensive effect of practical application is not great, etc.

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