Method for improving cadmium-contaminated soil restoring ability of galinsoga parviflora by the aid of hyperaccumulation plants

Abstract

The invention discloses a method for improving the cadmium-contaminated soil restoring ability of galinsoga parviflora by the aid of hyperaccumulation plants, and belongs to the field of restoration for environments contaminated by heavy metal. The method includes directly applying dried stalks of cut red-fruit youngia japonica into orchard soil in autumn, directly transplanting galinsoga parviflora seedlings or directly broadcasting seeds to prepare galinsoga parviflora seedlings; watering field soil to guarantee the water retention capacity of 80%, and performing daily management on the galinsoga parviflora; harvesting above-ground portions of the galinsoga parviflora after 50 days. Each directly transplanted galinsoga parviflora seedling has two pairs of spread true leaves. The dried stalks of the red-fruit youngia japonica is applied to the soil, so that the cadmium extraction quantity of the unit area of the galinsoga parviflora can be effectively increased by 13.8% by the aid of the method as compared with a non-application (contrast) method. The method has the advantages of low cost, high operability, environmental friendliness and capability of effectively restoring the soil contaminated by cadmium which is heavy metal.

Description

technical field [0001] The invention belongs to the field of remediation of environmental heavy metal pollution, in particular to a method for phytoremediation of cadmium pollution in orchards. Background technique [0002] Since the 20th century, the rapid development of science and technology has promoted economic development and improved people's living standards. As well as the development of the mining industry, it has seriously polluted the soil, water quality and atmosphere. However, cadmium (Cd), one of the "five poisons" of heavy metals, has the characteristics of concealment, long-term and irreversible pollution in the environment. Great influence. The "cadmium rice" incident was caused by soil pollution by cadmium. Therefore, cadmium-contaminated soil urgently needs to be treated. This year, my country will start the comprehensive treatment of heavy metal-contaminated farmland restoration. The Ministry of Agriculture advocates scientifically and rationally det...

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Problems solved by technology

[0002] Since the 20th century, the rapid development of science and technology has promoted economic development and improved people's living standards. As well as the development of the mining industry, it seriously pollutes the soil, water quality and atmosphere

Because the aboveground biomass o

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