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Transport Behavior of Cd2+ in Highly Weathered Acidic Soils and Shaping in Soil Microbial Community Structure

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Abstract

The mining and smelting site soils in South China present excessive Cd pollution. However, the transport behavior of Cd in the highly weathered acidic soil layer at the lead–zinc smelting site remains unclear. Here, under different conditions of simulated infiltration, the migration behavior of Cd2+ in acid smelting site soils at different depths was examined. The remodeling effect of Cd2+ migration behavior on microbial community structure and the dominant microorganisms in lead–zinc sites soils was analyzed using high-throughput sequencing of 16S rRNA gene amplicons. The results revealed a specific flow rate in the range of 0.3–0.5 mL/min that the convection and dispersion have no obvious effect on Cd2+ migration. The variation of packing porosity could only influence the migration behavior by changing the average pore velocity, but cannot change the adsorption efficiency of soil particles. The Cd has stronger migration capacity under the reactivation of acidic seepage fluid. However, in the alkaline solution, the physical properties of soil, especially pores, intercept the Cd compounds, further affecting their migration capacity. The acid-site soil with high content of SOM, amorphous Fe oxides, crystalline Fe/Mn/Al oxides, goethite, and hematite has stronger ability to adsorb and retain Cd2+. However, higher content of kaolinite in acidic soil will increase the potential migration of Cd2+. Besides, the migration behavior of Cd2+ results in simplified soil microbial communities. Under Cd stress, Cd-tolerant genera (Bacteroides, Sphingomonas, Bradyrhizobium, and Corynebacterium) and bacteria with both acid-Cd tolerance (WCHB 1-84) were distinguished. The Ralstonia showed a high enrichment degree in alkaline Cd2+ infiltration solution (pH 10.0). Compared to the influence of Cd2+ stress, soil pH had a stronger ability to shape the microbial community in the soil during the process of Cd2+ migration.

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Acknowledgements

The study was supported by the National Key Research and Development Program of China (Grant No. 2018YFC1800400), the National Natural Science Foundation of China (Grant No. 51909282), the Natural Science Foundation of Hunan Province of China (Grant No. 2022JJ40583), and the Hunan Provincial Key Research and Development Plan (Grant No. 2022WK2017).

Funding

This study was supported by the National Key Research and Development Program of China (Grant No. 2018YFC1800400), the National Natural Science Foundation of China (Grant No. 51909282), the Natural Science Foundation of Hunan Province of China (Grant No. 2022JJ40583), and the Hunan Provincial Key Research and Development Plan (Grant No. 2022WK2017).

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All authors commented and provided constructive revisions to the manuscript. The study was conceptualized and designed by authors JX Shi and LH Jiang. Material preparation, experimentation, investigation, data collection, and data analysis were performed by JX Shi, JJ Yang ZW Guo, KW Li, YL Peng. JX Shi wrote the initial draft of the manuscript. The final manuscript was read and approved by all authors.

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Correspondence to Luhua Jiang.

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Shi, J., Jiang, L., Yang, J. et al. Transport Behavior of Cd2+ in Highly Weathered Acidic Soils and Shaping in Soil Microbial Community Structure. Arch Environ Contam Toxicol 86, 73–89 (2024). https://doi.org/10.1007/s00244-023-01046-6

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  • DOI: https://doi.org/10.1007/s00244-023-01046-6

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