Method for repairing cadmium-contaminated soil by sedum alfredii hance, soil dressing method and low-absorption corn

Abstract

The invention relates to a method for repairing cadmium-contaminated soil by sedum alfredii hance, a soil dressing method and low-absorption corn, wherein the method comprises the following steps: (1)a cadmium-contaminated farmland in the eastern Guangdong region with the total cadmium content of 0.9-1.5 mg / kg is divided into a farmland A and a farmland B, and constructing a ridge between the twofarmlands; (2), sedum alfredii hance is planted in the farmland A in September, after the sedum alfredii hance grows for six months, earth surface plants are removed, innocent treatment is carried out, and then soil at roots of the sedum alfredii hance plants is dug out and placed in the farmland B; (3) in March of the next year, Jingzhongyu corn seeds are directly sown in the soil in the farmland A, and the soil covers and tread down after sowing is completed; after corn matures in the middle ten days of August, earth surface plants are removed, innocent treatment is carried out, soil at theroots of the plants is taken out and put into the farmland B, and the operation is circulatingly repeated multiple times untill the farmland A is completely repaired; and (4) sedum alfredii hance isplanted in the farmland B all the time, and the operation is circulatingly repeated multiple times until the farmland B is completely repaired. The method is safe, stable, economical and high in repairing efficiency.

Description

technical field [0001] The invention relates to the technical field of soil-polluted phytoremediation, in particular to a method for remediating cadmium-contaminated soil by using Sedum sedum, guest soil method and low-absorbing corn. Background technique [0002] Soil is the material basis for human survival. However, the rapid economic and social development in recent years has caused serious soil cadmium pollution in my country. At present, the cultivated land area polluted by heavy metals in my country is about 2000×10 4 hm 2 , as many as 1200×10 grains are polluted by heavy metals every year 4 t , the economic loss is at least 200×10 8 Yuan. Cadmium (Cd) is one of the most toxic heavy metal elements. It is difficult to degrade and accumulate in metabolism. The toxicity to human tissues and organs is mainly to damage the kidneys and cause osteoporosis and other diseases. Therefore, how to control and reduce cadmium pollution in soil has become an urgent problem ...

AI Technical Summary

Problems solved by technology

However, in the high temperature environment of Guangdong in summer, the roots of Sedum sedum are easy to rot and even die, and the reproduction coefficient is low. Therefore, high temperature and high humidity are the key limiting factors for the growth of Sedum sedum (Zhi Zhongzhen, He Lihong, Yu Tuyuan, et al. Research on propagation of stem cuttings and leaf cuttings[J]. Northern Horticulture, 2011(22):64-67.), which reduces its ability to remediate heavy metal-contaminated farmland

And because the plants grow slowly, the repair process takes a long time, and the repair cost and economic loss will increase with time.

In addition, although chelation induction technology can effectively improve the efficiency of plants in remediating soil heavy metals, most artificial chelators have low degradation ability and can remain in the soil for a long time, posing potential ecological risks.

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