Research on Phytoremediation of Heavy Metal Contaminated Soil
Phytoremediation is a low-cost and simple method for in-situ remediation of heavy metal contaminated soils,but its large-scale popularization is limited by its low efficiency and long remediation cycle.At present,exogenous chelating agents,microorganisms and plant hormones are used to enhance the phytoremediation effect of heavy metal contaminated soil.In order to understand the research progress of phytoremediation of heavy metal contaminated soil enhanced by exogenous substances,the effects of typical plants such as ryegrass,castor and Ramie on the remediation of heavy metal contaminated soil were summarized,the mechanism of exogenous substances to improve the effect of phytoremediation of heavy metal pollution in soil was expounded,and the limitations of current strengthening methods were discussed.Exogenous application of chelating agents,microbial agents and plant hormones can improve the ability of phytoremediation of heavy metal contaminated soil by activating heavy metal ions,promoting heavy metal ion transport,stimulating plant growth and development,improving plant stress resistance,strengthening the partition function of heavy metal regions in cells and regulating metabolic response pathways.However,a single strengthening method is difficult to meet the requirements of improving the efficiency of phytoremediation of heavy metal contaminated soil.in the future,the research on chelating agent-microbial agent-plant hormone compound reinforcers should be strengthened,and the mechanism of synergistic enhancement of phytoremediation of heavy metal contaminated soils by compound reinforcers should be explored.
NETL
NSTL
万方数据
