Method for repairing heavy metal cadmium contaminated soil while producing

Abstract

The invention discloses a method for repairing heavy metal cadmium contaminated soil while producing. The method comprises the following steps that the soil polluted by the cadmium is scarified into acompartment surface, the mode of furrow control irrigation is adopted, and rice seedlings with low cadmium accumulation plants are transplanted to the furrow; before or after the rice is planted, thecadmium-enriched plant black nightshade is planted on the compartment surface; at the period of the rice from being thrown to being mature, the furrow is kept with thin water layer and the water depth is smaller than or equal to 5cm, and the soil layer with the thickness of 5-10cm below the compartment surface is kept not flooded; the black nightshade and the rice are harvested sequentially or simultaneously, when harvesting the black nightshade, the full-plant is harvested or overground part is kept at a height of 2-5cm; and the centralized treatment on the harvested black nightshade or resourceful processing treatment is carried out. According to the method, the capacity for absorbing and enriching the heavy metals by the super-enriched plants is improved, and meanwhile, the amount of the soil and the accumulated heavy metals in the rice is reduced, the effect of repairing the polluted soil while producing safely is achieved, and the efficiency is high, the operation is easy, the secondary pollution is free, the cost is low and the like.

Description

technical field [0001] The invention belongs to the technical field of phytoremediation in soil heavy metal restoration. Specifically, it relates to a method for repairing heavy metal cadmium-contaminated soil while producing; more specifically, it relates to an intercropping cultivation method suitable for low-accumulation rice-hyperaccumulative plant Solanum nigrum in cadmium-contaminated paddy fields and its application in paddy field soil pollution control in the application. Background technique [0002] In recent years, the harm caused by heavy metal pollution in my country has gradually emerged, and environmental risks have become increasingly prominent. Among heavy metal pollution, cadmium pollution is a prominent problem, especially soil cadmium pollution and cadmium rice have attracted much attention. According to relevant data, about one-sixth of my country's rice fields are polluted by arsenic and cadmium to varying degrees, and the polluted area is increasing ...

AI Technical Summary

Problems solved by technology

Therefore, for this kind of real polluted soil, it takes a long time to directly plant the existing enrichment plants, and it is of little significance to achieve the restoration effect. Strengthening measures must be taken to improve the efficiency of phytoremediation.

[0005] CN103109651A discloses a method for repairing cadmium-contaminated vegetable fields while producing. The selected high-accumulation crops are Solanum nigrum, and the ultra-low-accumulation crops are Japanese hardcore onion king. Habitat and different cultivation methods have different adsorption effects on pollutants, which greatly affect the growth of crops.

In addition, the current research and application of phytoremediation of heavy metals is mainly on dry land, not many wetlands and rice fields are involved. It is related to the use of plant and rice box-furrow intercropping systems to achieve biodiversity planting and increase ecological edge effects, and improve ecosystem productivity to achieve The academic research and practice of production-while-remediation of polluted paddy fields have not been reported yet