Method for restoring cadmium and lead polluted farmlands through enriched sunflower varieties

Abstract

The invention provides a method for restoring cadmium and / or lead polluted farmlands through enriched sunflower varieties. The method includes the steps of sowing sunflowers into moderately or slightly cadmium and / or lead polluted soil, absorbing cadmium and / or lead in the polluted soil through root systems of the sunflowers and transferring the cadmium and / or lead to the over-ground part; and harvesting the sunflowers absorbing the cadmium and / or lead. After harvested, the sunflowers can be transported to a special site uniformly and receive innocent treatment. According to the method, the sunflowers can absorb and accumulate the cadmium and / or lead in the polluted farmland soil and transfer the cadmium and / or lead to the over-ground part according to the characteristics of high stress resistance, fast growth, large biomass and co-enrichment of the cadmium and / or lead of the sunflowers, and therefore the content of the cadmium and / or lead in the polluted soil can be lowered. The method is suitable for treating and restoring the moderately or slightly cadmium and / or lead polluted farmland soil. Because the stress resistance of the sunflowers is high and management of the sunflowers is extensive in the growth process, the cost is low, the operability is high, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal pollution in the environment, in particular to a method for remediating cadmium and / or lead polluted farmland by using enrichment sunflower varieties. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. The health of the soil environment is related to the quality of agricultural products and human health. In recent years, soil heavy metal pollution has become a serious environmental problem facing the world. At present, my country's farmland soil is seriously polluted by heavy metals. According to the results of the first national soil pollution survey, the rate of soil points exceeding the standard in my country's cultivated land is 19.4%, of which the proportions of slightly, lightly, moderately and heavily polluted points are 13.7%, 2.8%, 1.8% and 1.1%; and from the perspective ...

AI Technical Summary

Problems solved by technology

[0004] In phytoremediation technology, it is common to use hyperaccumulator plants to absorb cadmium and / or lead heavy metals in polluted soil. Minor problems limit its repair efficiency and promotion value

Moreover, hyperaccumulator plants usually need to grow in spring and summer in the south where the climate is suitable. When they are applied to farmlands polluted by medium and low heavy metals in the north, they will not only occupy farmland resources, but also limit their promotion, thereby affecting the restoration of farmland soil environmental quality.

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