Author(s)

Miao Yining ¹, Bao Yuhang ², Zhao Hang ¹

Affiliation(s)

¹ College of Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China
² College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China

Corresponding Author

Miao Yining

ABSTRACT

In recent years, with the rapid development of industrialisation, soil heavy metal pollution is increasing, of which cadmium pollution is particularly prominent. Cadmium pollution not only leads to crop root damage, photosynthesis inhibition, but also indirectly affects the safety of human life, remediation of cadmium contaminated soil is urgent. As one of the phytoremediation materials, tall fescue is effective in remediating cadmium-contaminated soil.In this study, we used the cadmium-resistant tall fescue variety "Airey 3" as the material. It was subjected to various concentrations of cadmium stress, and within the same cadmium concentration, different concentrations of citric acid, oxalic acid, and acetic acid were applied. We conducted a comprehensive investigation into the impact of cadmium pollution on the soil environment, aiming to explore the remediation capacity and mechanism of tall fescue in cadmium-contaminated soil. Additionally, we analyzed the relationship between low-molecular-weight organic acids and the root-associated microbiota.The correlation between low molecular organic acids and inter-root microbial community structure, soil enzyme activity and other indicators was analysed. The results showed that all the physical and chemical indicators of the soil were under different degrees of stress under the adversity, and the total microbial amount decreased by 60.12%, the community structure changed, and the enzyme activity, soil nutrient and organic matter content decreased significantly. And certain low molecular organic acid can effectively enhance the repair ability of tall fescue, the maximum average increase in soil organic matter was 119.12%~142.55%, effective phosphorus and quick-acting potassium content increased by 32.87% and 34.58%. In summary, tall fescue has a certain role in the remediation of cadmium-contaminated soil, and the application of exogenous organic acids can effectively enhance the soil remediation capacity of tall fescue in cadmium-stressed environments, which provides a theoretical basis for promoting the management of cadmium pollution in soils and improving the value of cadmium-contaminated soil development and utilisation.

KEYWORDS

Tall fescue; cadmium pollution; phytoremediation; low molecular organic acids

CITE THIS PAPER

Miao Yining, Bao Yuhang, Zhao Hang, Research on the impact of exogenous pollutants on the soil environment and their remediation mechanisms and models. Journal of Modern Crop Science (2024) Vol. 3: 44-54. DOI: http://dx.doi.org/10.23977/jmcs.2024.030106.

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