Method for remediating cadmium contaminated soil by using ornamental plant smooth joyweed

Abstract

The invention relates to phytoremediation technology in a heavy metal contamination environment, in particular to a method for remediating cadmium contaminated soil by using an ornamental plant smooth joyweed. In the method, the smooth joyweed (preserved in National Crop Germplasm Conservation Center, and the variety name is J589193) is planted on cadmium contaminated soil (including wet land), and a great amount of cadmium in the contaminated soil is absorbed through the root system of the smooth joyweed and is transferred to an overground part of the plant. When the plant grows to the end of the growing period or the biomass of the overground part is maximum, the overground part of the plant is moved away from the contaminated soil and is subjected to proper treatment, and the aim of continuously extracting and removing cadmium from the soil is fulfilled by repeatedly planting the plant and repeating the process. By remediating and treating the cadmium contaminated soil by using theenriched plant smooth joyweed, the method has the advantages of high efficiency, low cost, high operability, easy popularization and application, no damage to soil structure, no secondary contamination and the like, and also has good effect on soil erosion prevention and landscaping in contaminated fields.

Description

【Technical field】 [0001] The invention belongs to the technical field of phytoremediation of heavy metal-polluted environments, and in particular relates to a plant which has tolerance to heavy metal cadmium and efficiently absorbs and enriches the plant and its application method on cadmium-polluted soil. 【Background technique】 [0002] Heavy metal pollution is the main form and one of the most prominent problems of soil pollution, which seriously threatens crop yield, quality and food chain safety. Its pollution mainly comes from waste water, waste gas, and waste residue discharged from industries such as mining, smelting, electroplating, chemical industry, and waste incineration, as well as vehicle exhaust emissions, and the application of pesticides and fertilizers. According to reports, the area of ​​cultivated land polluted by heavy metals such as cadmium (Cd), chromium (Cr), and lead (Pb) in my country is nearly 20 million hm 2 , accounting for about 1 / 5 of the total...

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Problems solved by technology

However, some enrichment / hyperaccumulation plants found at present have problems such as lack of species, small biomass, slow growth, difficult cultivation and strong specificity, and are difficult to operate in actual use and difficult to promote and apply on a large scale (Document 5: Zhou Dongmei , Hao Xiuzhen, Xue Yan, etc. Research Progress on Remediation Technology of Contaminated Soil. Ecological Environment, 2004, 13(2): 234-24)

For the heavy metal cadmium, the hyperaccumulator plants found are quite limited, and there is even a lack of plants with independent intellectual property rights in my country.

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