Phytoremediation combination method for severe-plumbum-pollution paddyfield soil

Abstract

The invention relates to a phytoremediation combination method for severe-plumbum-pollution paddyfield soil, and belongs to the technical field of prevention of heavy metal pollution of soil. The method is characterized in that (1), the phytoremediation combination comprises five plants as follows: barnyard grass, alternanther philoxeroides, wild rice shoots, monochoria vaginalis and red-knees herb; (2), the planting method is as follows: plants of different types and different heights are planted alternately, and the interval between two plants is 20 cm; (3), the plant harvesting time and the harvesting method are as follows: 50 days after planting, when the quantity of absorbed and extracted Pb reaches a saturation condition, harvesting is carried out at one time, and whole plants are pulled up by the roots, and then centralized processing is carried out. In areas with severe-plumbum-pollution paddyfield soil (the Pb concentration of the soil is 300mg / kg and reaches more than three times of the Pb prohibitive content of soil in agricultural producing areas for edible agricultural products), through six turns and about 300 days of phytoremediation, the Pb content of the paddyfield soil can be restored to be up to the quality standard of the soil in agricultural producing areas for edible agricultural products (the Pb concentration of soil is less than 80mg / kg).

Description

technical field [0001] The invention relates to a phytocombination restoration method for severely lead-polluted paddy field soil, which belongs to the soil heavy metal pollution prevention and control technology. Background technique [0002] Among various heavy metal pollutants, lead (Pb) has received high attention because Pb is widely used and has become the metal element with the largest pollution area. On the earth, there is almost no place that is not polluted by Pb, and even the Pb content of the Arctic ice is 10-100 times that of prehistoric ice, and the Pb content of the Antarctic ice is 10 times higher than that of the Arctic ice. [0003] Excessive Pb has toxic effects on various organs such as the central nervous system, red blood cells, kidneys, cardiovascular and reproductive systems of men and women. Long-term experiments have shown that exposure to lower doses of Pb (blood Pb concentration of 10-20 μg / dl) during pregnancy and early childhood will cause irre...

AI Technical Summary

Problems solved by technology

At present, in the field of phytoremediation of heavy metal-contaminated soil, there is still a lack of research on plant species selection, configuration and growth control, which severely limits the application of phytoremediation technology in heavy metal-contaminated soil.

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