Method for repairing cadmium-polluted soil through mulberry trees

Abstract

The invention discloses an efficient repair method for treating cadmium-polluted soil through mulberry trees. Repair of the cadmium-polluted soil is completed on the aspects of conducting soil preparation and fertilization, selecting the mulberry tree variety high in cadmium pollution resistance, reasonably planting young mulberry tree seedlings in a closed mode at the right moment, constructing and managing a mulberry tree seedling garden, adding a chelating agent and the like. By selecting the specific mulberry tree variety and completing the normal production cycle in the cadmium-polluted soil, the content of cadmium in the soil is effectively lowered; silkworms are fed through mulberry leaves to produce silkworm cocoons, and therefore cadmium in the soil can be prevented from harming health of human body through food chains; meanwhile, repair of the cadmium-polluted soil is completed within a short time period. The method is a plant repair technology high in economical value; compared with other applicable repair plants, mulberry trees have higher resistance to cadmium pollution, higher adsorption capacity, shorter repair time and safe and efficient economic benefits, and have wide application prospects in vast areas polluted by heavy metal mainly including cadmium.

Description

technical field [0001] The invention belongs to the technical field of soil pollution treatment and restoration, and in particular relates to an efficient restoration method for treating cadmium-contaminated soil by using mulberry trees. Background technique [0002] Soil heavy metal pollution has the characteristics of concealment, irreversibility, long-term and serious consequences. The treatment of heavy metal pollution in the soil system is currently an international problem and research hotspot. Countries around the world have conducted extensive research on soil heavy metal pollution remediation technology, and achieved made some progress. Specifically, there are several restoration measures as follows: (1) Engineering measures, mainly including foreign soil, soil replacement and deep plowing; (2) Physical and chemical restoration, mainly including electric restoration, electrothermal restoration and soil leaching; (3) )Chemical remediation, adding amendments to the s...

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the use of mulberry in soil heavy metal pollution control and remediation, especially in the treatment of heavy metal cadmium-contaminated soil, there are still many technical bottlenecks and technical obstacles: (1) Although there are many varieties of mulberry, but the real The mulberry species used to control metal cadmium is not yet clear. The applicant found that some mulberry species are difficult to complete the growth cycle in soil contaminated by metal cadmium in the research results and practical effects. At the same time, mulberry species with underdeveloped root systems directly affect soil restoration. Therefore, it is necessary to select specific varieties with obvious tolerance to cadmium when treating cadmium-contaminated soil.

(2) The planting of common mulberry trees is mainly used to obtain mulberry leaves, but the main issue that needs to be considered when treating cadmium-contaminated soil is the effect of the development of mulberry root system on the restoration of cadmium in the soil without affecting the yield of mulberry leaves. Reasonable dense planting is a specific technical issue that determines the effect of soil restoration and high yield of mulberry leaves