Abstract
To improve the remediation of heavy metal pollution by typical wetland vegetation and maintain the health of wetland ecosystems under the water-sediment regulation scheme (WSRS) application, we evaluated the potential ecological risk of heavy metals in surface sediment in the Yellow River estuary affected by the WSRS. The ranges of Cr, Cu, Zn, Cd, and Pb content in surface sediment were 52.44–100.80 mg·kg−1 dry weight (DW), 16.38–21.19 mg·kg−1 DW, 64.77–255.50 mg·kg−1 DW, 0.12–0.24 mg·kg−1 DW, and 5.40–8.63 mg·kg−1 DW, respectively, and potential ecological risk coefficients showed that Cd was associated with moderate potential risk. We further examined effects of Cd in a greenhouse experiment to explore the influence of short-term Cd input and water logging condition changes induced by WSRS on the Cd absorption characteristics of Suaeda salsa (L.) Pall in the Yellow River estuary. The results showed that total biomass decreased but Cd content in tissue of S. salsa increased with increasing Cd input and the accumulation factor reached maximum values at 100 μg·L−1 of Cd, indicating that S. salsa efficiently accumulated Cd. Water logging depth significantly affected S. salsa growth and Cd absorption with deeper water logging being detrimental to growth. The interaction effect of Cd input and water logging depth on Cd content and accumulation factor was significant. These results suggest that WSRS caused short-term heavy metal input and changes in water conditions affect wetland vegetation growth and heavy metal absorption in the downstream estuary.
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The datasets used for the current study are available from the corresponding author on reasonable request.
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This work was supported by the Natural Science Foundation of Shandong Province (grant numbers: ZR2021MD003, ZR2021MD045, ZR2020MD102), Innovation and Entrepreneurship Training Program for College Students (202210452013), and the National Natural Science Foundation of China (grant number: 41601086; 41977067).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Hongli Song, Juan An, and Lizhi Wang. The first draft of the manuscript was written by Hongli Song and Lin Kuang, and the multi-way ANOVA analysis was performed by Wanni Yu. Yuanzhi Wu and Xiyuan Wu commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Song, H., Kuang, L., Wang, L. et al. Potential ecological risks of heavy metals and Cd accumulation characteristics of Suaeda salsa under different Cd input and water logging conditions in the Yellow River estuary, China. Environ Sci Pollut Res 30, 85170–85183 (2023). https://doi.org/10.1007/s11356-023-28373-4
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DOI: https://doi.org/10.1007/s11356-023-28373-4