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Tolerance and Enrichment Characteristics of Moso Bamboo to Complex Heavy Metal–Contaminated Soil

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Abstract

Purpose

With the aim of supplementing resources related to new phytoremediation species to address contaminated soil in tailings areas, this study selected Moso bamboo (Phyllostachys pubescens) as a test material to investigate its enrichment characteristics and tolerance mechanism for heavy metals in contaminated soil in tailings areas.

Methods

The heavy metal enrichment characteristics of Moso bamboo were investigated by ionomics, and the physiological responses of Moso bamboo after remediation were analyzed in terms of photosynthetic parameters, chlorophyll fluorescence parameters, and antioxidant metabolic enzyme activities.

Results

The plant height of Moso bamboo decreased by 22.6%, leaf length by 25.9%, leaf width by 21.3%, and basal diameter by 26.7% under heavy metal contaminated soil conditions (P < 0.05). The photochemical quenching index (qP) and non-chemical quenching index (NPQ) decreased by 29.8% and 42.2%, respectively (P < 0.05). Intracellular CO2 concentration (Ci) and water use efficiency (WUE) decreased by 31.4% and 36.9%, respectively (P < 0.05). The activities of peroxidase (POD) and catalase (CAT) decreased by 39.3% and 22.6%, respectively (P < 0.05). The results of the above-ground and below-ground heavy metal enrichment of Moso bamboo under different treatments showed that the above-ground content of Cr, Mn, Ni, Cu, Zn, and Pb was significantly higher than that of the below-ground roots, with the transfer coefficients reaching 2.92, 3.06, 1.85, 4.95, 7.48, and 2.44 for Moso bamboo in the treatment groups, respectively.

Conclusion

The soil contaminated with heavy metals from the tailings mine has an obvious inhibitory effect on the growth of Moso bamboo, but the Moso bamboo can grow normally and has a certain tolerance ability and a strong enrichment capacity for heavy metals. In summary, planting Moso bamboo in the contaminated area can restore the ecological environment of the soil around the tailing area. Moso bamboo can adopt to the complex heavy metal pollution conditions in mining areas and can be used as a new tailings remediation species that can make a great contribution to the local financial economy and environmental management. It provides a certain reference value for future research in the field of tailings pollution management and phytoremediation.

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Funding

This study was financially supported by the National Defense Basic Research Program (no. 16ZG6101).

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Cai Qi-Hang. The first draft of the manuscript was written by Cai Qi-Hang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yu Zhang.

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Qi-hang Cai and Yu Zhang are co-first authors.

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Cai, Qh., Zhang, Y. & Luo, Xg. Tolerance and Enrichment Characteristics of Moso Bamboo to Complex Heavy Metal–Contaminated Soil. J Soil Sci Plant Nutr 23, 2913–2926 (2023). https://doi.org/10.1007/s42729-023-01275-7

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  • DOI: https://doi.org/10.1007/s42729-023-01275-7

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