Plant combination repairing method for severely-cadmium-polluted paddy soil

Abstract

The invention relates to a plant combination repairing method for severely-cadmium-polluted paddy soil, and belongs to the technical field of prevention of soil heavy metal pollutions. The method is characterized in that firstly, a plant combination for repairing comprises six plants including reeds, herbs of alligator alternanthera, wild rice shoots, panicum crus, sheathed monochoria herbs and globose zosasa; secondly, according to a plant plating method, the plants of different varieties and heights are planted at intervals, and the interval between the plants is 20cm; and thirdly, in the plant harvesting period, according to the harvesting method, after the plants are planted for 50 days, and the amount of absorbed and extracted Cd reaches the saturation condition, harvesting is carried out at one time, and the whole plants are rooted out and are subjected to centralized treatment. In the paddy soil heavy Cd polluted area (the Cd concentration of the soil is 1mg / kg, and reaches more than three times of the limiting value of the soil Cd content of the edible agricultural product producing area), through three-turn plant repairing which lasts about 150 days, the Cd content of the paddy soil can be repaired to meet the edible agricultural product producing area soil quality standard (the Cd concentration of the soil is smaller than 0.3mg / kg) of the China.

Description

technical field [0001] The invention relates to a phytocombination restoration method for heavily cadmium-polluted paddy field soil, which belongs to the soil heavy metal pollution prevention and control technology. Background technique [0002] Since the 1950s, with the substantial increase in population, the rapid development of industries such as mining, smelting and manufacturing, the extensive use of agricultural chemicals and the discharge of urban sewage and sewage, resulting in the harmful effects of Cd, Pb, Hg, Cu, etc. Biotoxic metal elements are rapidly and excessively accumulated in the environment. This environmental pollution problem caused by human activities has attracted widespread attention. Most of these metal elements are summarized together and are called "heavy metals". element. Among the various heavy metal elements, cadmium (Cd) is one of the most concerned elements, because Cd is easily absorbed by plants and is often enriched in the human body thro...

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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