Method for improving phytoremediation efficiency of heavy metal hyperaccumulation by using spraying agent

Abstract

The invention relates to the technical field of soil remediation, in particular to a method for improving the phytoremediation efficiency of heavy metal hyperaccumulation by using a spraying agent. The spraying agent is prepared from 25 mg*L<-1> of heteroauxin and 20 mg*L<-1> of kinetin, firstly, the spraying agent is cooperatively irrigated to plant leaves and soil around rhizosphere, and then the spraying agent is applied on the leaf surface every time after harvesting. The method for improving the phytoremediation efficiency of the heavy metal hyperaccumulation by using the spraying agent has the advantages that the investment and maintenance cost is low, the method is environmentally friendly, and can be widely used in the remediation of soil containing higher heavy metal, the cultivation use of subsequent soil is not affected, the phytoremediation efficiency is improved, the effect is quick, for medium-and-low pollution soil, the heavy metal pollution can be reduced to an ideal state through only several very short growth cycles, for example, the arsenic content in the soil can be reduced by 25% during first harvesting and can be reduced by 50% after one year; and lead and cadmium content in the soil can be reduced by 18% and 27% respectively after harvesting twice, so that the effect is significant.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for improving the remediation efficiency of heavy metal hyperaccumulation phytoremediation by using a spraying agent. Background technique [0002] Soil heavy metal pollution is one of the major environmental hazards in the world. China's first soil survey shows that nearly 20% of my country's arable land has heavy metals such as cadmium, arsenic, mercury, lead, nickel, and copper exceeding the standard. Soil heavy metal pollution is concealed, long-term and irreversible. Pollutants stay in the soil for a long time and cannot be degraded by plants or microorganisms. The main hazards include soil degradation, affecting the development of plant roots and leaves, and affecting crop yield and quality. It may also enter the food chain through crop absorption, seriously affecting food safety and endangering human health. Therefore, all countries in the world attach g...

AI Technical Summary

Problems solved by technology

[0005] (2) Chemical remediation, specifically adding modifiers or active agents to the soil to change the acidity and alkalinity, redox conditions or ion composition of the soil, thereby affecting the adsorption, redox, antagonism or precipitation of heavy metals , and finally reduce the pollution of heavy metals, but this method can only improve the degree of soil pollution without reducing the total amount of heavy metals, or it is only suitable for lightly polluted soils, and there are still problems that are not easy to control

[0008] At present, most of the researches on phytoremediation focus on this kind of single phytohormone, and there are few studies on the combined application of different hormones to improve the extraction efficiency of heavy metals in hyperaccumulator plants.