Method for repairing soil heavy metal pollution by using ixeris denticulata

Abstract

The invention relates to a phytoremediation technology of heavy metal contaminated soil, and solves such problems as incapability of harvesting plants by many times, season limitation, slow growth, low ground biomass, low total quantity of absorbed and accumulated heavy metal and no possession of better economic benefit in a traditional heavy metal contaminated soil repair technology. The method comprises the following steps: ixeris denticulata is planted in heavy metal compound contaminated soil according to natural growing season for routinely cultivating. No obvious poison symptom is generated; the output of ixeris denticulata is not influenced; the ground biomass is high; 4-6 times of clipping can be performed in the growing season without influencing the growing speed; a lot of various heavy metal can be absorbed and accumulated; and the content of the heavy metal in plants is obviously higher than the background value of heavy metal in soil, and heavy metal in the plants reaches an enrichment level. The method is simple in cultivation; the ixeris denticulata, as conventional grass, is higher in economic value, and is detoxified to prevent the heavy metal from entering a food chain again; and the abundant economic incomes can be obtained while the pollution is treated.

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 using bitter gourd. Background technique [0002] With the development of industry, the aggravation 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 (PambrunV, MarquotA, Racault. 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 in the world is about 15,000 tons, Cu is 3.4 million tons, Pb is 5 million tons, Mn is 15 million tons, and Ni is 1 million tons. [1] . Heavy metal pollution will lead to soil degradation and reduce the yield and quality of crops (Luo Yongming, Teng Ying. my country's soil pollution and degradation status and countermeasures [J]. Soil...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for remediating heavy metal pollution in soil by using Amaranthus chinensis, so as to solve the problems of plants that cannot be harvested multiple times, seasonal restrictions, slow growth, low aboveground biomass, and absorption and accumulation in the existing heavy metal contaminated soil remediation technology. The total amount of heavy metals is small, only has resistance and enrichment ability to a single heavy metal, does not have good economic benefits, and the comprehensive effect of practical application is not great, etc.

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