Method for repairing soil heavy metal cadmium pollution through endive-oil sunflower crop rotation mode

Abstract

The invention provides a method for repairing soil heavy metal cadmium pollution through an endive-oil sunflower crop rotation mode. According to the method, endives and oil sunflowers are planted in the soil of heavy metal compound pollution in the endive-oil sunflower crop rotation mode according to the natural growing periods of the endives and the oil sunflowers, and conventional cultivation is conducted. Both the endives and the oil sunflowers can grow normally in the cadmium-polluted soil, no obvious toxic symptom occurs, and the yield of the endives and the oil sunflowers is not influenced. In addition, the biomass of the overground part is large, a large quantity of various heavy metals can be absorbed and accumulated, especially the content of the heavy metal cadmium in the plants is obviously larger than the soil background value, and the enrichment level is reached. By the adoption of the method, cultivation is easy, the management cost is low, the oil sunflowers have quite high edible value and medicinal value, the endives contain a large amount of protein and have quite high feeding value, the heavy metals can be prevented from entering the food chain again through simple treatment, and high economic income can be obtained while pollution treatment is achieved.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating heavy metal cadmium pollution in soil by using a chicory-oil sunflower rotation pattern. Background technique [0002] With the deterioration of environmental quality and the increasing dependence on agrochemicals, soil heavy metal pollution has become a hot spot of concern all over the world. It is estimated that the currently polluted arable land area in China is nearly 20 million hm 2 , accounting for about 1 / 5 of the cultivated land area, and the area of ​​farmland sewage irrigation has reached more than 1.3 million hm 2 . Every year, 10 million tons of grain production is reduced due to land pollution, and the direct economic loss is more than 10 billion yuan. [0003] In northern France, due to the rapid development of the metallurgical industry in the 20th century, the soil was seriously polluted by heavy metals. Accordi...

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Problems solved by technology

[0007] The purpose of the present invention is to, aiming at the deficiencies in the above-mentioned prior art, provide a kind of method that utilizes chicory-oil sunflower rotation mode to remediate soil heavy metal cadmium pollution, to solve the seasonal restriction, slow growth, and The biomass of the aboveground part is low, the total amount of heavy metals absorbed and accumulated is small, it does not have good economic benefits, and the comprehensive effect of practical application is not great.

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