A method for repairing cadmium and lead-contaminated farmland in winter by using cold-resistant winter rapeseed varieties

Abstract

The invention provides a method for utilizing cold-resistant winter rapes for repairing cadmium and / or lead polluted farmland in winter. The method comprises the steps that before winter comes, the winter rapes are sown into the medium or mild cadmium and / or lead polluted soil, sprout, survive and grow, the root systems of the winter rapes absorb heavy metal cadmium and / or lead in the polluted soil, and the heavy metal cadmium and / or lead are / is transferred to the position above the ground; and the winter rapes absorbing the heavy metal cadmium and / or lead are harvested. After the winter rapes are harvested, the winter rapes can be conveyed to an exclusive place to be subjected to harmless treatment in a centralized manner. According to the method, the characteristics that the winter rapes are high in cold resistance and gather the cadmium and / or lead together are utilized, the cadmium and / or lead heavy metal accumulated in the polluted farmland soil are / is absorbed and transferred to the overground part, and therefore the content of cadmium and / or lead in the polluted soil is reduced. The method is suitable for treating and repairing of the medium or mild cadmium and / or lead polluted farmland soil in winter, and meanwhile due to the fact that the winter rapes are high in cold resistance, management is extensive in the growing process, and the farmland resource in summer is not occupied, the cost is low, operability is high, and good actual application prospects are achieved.

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 in winter by using cold-resistant winter rape 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 ...

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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 when the climate is suitable. When they are used to absorb heavy metals in farmland soil, they will definitely occupy farmland resources and affect their production value.

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