Repair method for cadmium polluted soil by arbuscular mycorrhiza-alfalfa symbiont

Abstract

The invention discloses a repair method for cadmium polluted soil by an arbuscular mycorrhiza-alfalfa symbiont. The repair method comprises the following steps: S1, preparing an arbuscular mycorrhizafungi fungicide; S2, treating alfalfa seeds; and S3, inoculating the arbuscular mycorrhiza fungi fungicide to the surface sol layer of the cadmium polluted soil; then planting the alfalfa seeds for field management; and after growth, harvesting plant materials, airing and transferring the plant materials, and incinerating the plant materials in a centralized manner to repair the cadmium polluted soil. By combining a microbial repair technology with a plant repair technology, the repair method solves the problem that the repair method is prevented from being popularized and applied on a large scale as a green repair technology because the microbial repair speed is slow, the responding time is long and the soil environmental requirement is high, is low in cost by plant repair, good in comprehensive ecological benefit, suitable for being popularize on a large scale and the like, and has the characteristics of being economical and convenient to repair microbially, not changing the inherentphysical and chemical properties of soil and the like. The obtained repair method is high in treatment capacity, economic, convenient and suitable for being popularized on a large scale.

Description

technical field [0001] The invention relates to a method for repairing cadmium-contaminated soil, in particular to a method for repairing cadmium-contaminated soil by arbuscular mycorrhiza-alfalfa symbionts. Background technique [0002] At present, the problem of my country's cultivated land being polluted by heavy metals such as cadmium, arsenic, and lead is becoming more and more serious, and the resulting economic losses are also increasing. It is reported that the economic losses caused by heavy metal pollution in my country are at least 20 billion yuan every year. Among all heavy metal pollution, cadmium pollution is the most serious. In recent years, with the development of industries such as mining, metallurgy, and cadmium treatment, agricultural soil in my country has become increasingly polluted by cadmium. Since cadmium cannot be degraded by microorganisms in the soil, its half-life exceeds 20 years, and its pollution is an irreversible accumulation process; cadm...

AI Technical Summary

Problems solved by technology

[0003] The complexity and difficulty of remediation of cadmium-contaminated soil means that there is currently no truly stable and efficient remediation technology that can meet the needs of actual production; physical remediation and chemical remediation can quickly reduce the cadmium content in soil, but they only change The existing form of cadmium in the soil has not been completely removed, and there are often problems of high cost, huge engineering volume, and secondary environmental pollution; animal remediation and microbial remediation, as a green remediation technology, are economical, It is convenient and does not change the inherent physical and chemical properties of the soil, but its slow repair speed, long effective time, and high requirements on the soil environment limit its large-scale application

The use of plants to repair the environment polluted by cadmium is not only low cost, but also has good comprehensive ecological benefits, especially suitable for large-scale promotion, but its effect on cadmium-contaminated soil cannot be maximized