Method for repairing cadmium polluted farmland through Sedum Spectabile Boreau

Abstract

The invention provides a method for repairing cadmium polluted farmland through Sedum Spectabile Boreau. The method comprises the steps that the Sedum Spectabile Boreau is planted on cadmium polluted farmland in a cuttage mode, and a large amount of cadmium in the cadmium polluted farmland is absorbed through the root system of the Sedum Spectabile Boreau, the Sedum Spectabile Boreau is transferred to the ground to be accumulated; when the overground part of the Sedum Spectabile Boreau grows to 30-50 cm, defoliation is conducted and needs to reserve 4-5 cm of the overground part of the Sedum Spectabile Boreau, and the overground part of the Sedum Spectabile Boreau is transferred away so as to remove cadmium in the polluted soil; and the rest of the Sedum Spectabile Boreau can continue to grow and absorb cadmium in the soil, secondary defoliation is conducted when the overground part of the Sedum Spectabile Boreau grows to 30-50 cm, and the content of cadmium in the soil can be reduced continuously. The method for repairing the cadmium polluted farmland through the Sedum Spectabile Boreau has the advantages of being easy to operate and manage, low in expense, high in cadmium removal efficiency, good in repairing effect and the like; meanwhile, the Sedum Spectabile Boreau is a kind of ornamental plant, the function of beautifying the environment can be achieved while the polluted soil is repaired, and a certain economic value is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and relates to a phytoremediation technology polluted by heavy metals in soil, in particular to a method for remediating cadmium-contaminated farmland by using Sedum sedum babao, a plant of the sedum family. 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...

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Problems solved by technology

[0004] In phytoremediation technology, it is relatively common to use hyperaccumulator plants to absorb heavy metal cadmium in polluted soil. However, the hyperaccumulator plants found so far usually have problems such as poor adaptability to soil climate, slow growth, and small biomass. It limits its repair efficiency and promotion value, and has become a bottleneck that needs to be broken through in phytoremediation technology

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