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Mercury uptake by Paspalum distichum L. in relation to the mercury distribution pattern in rhizosphere soil

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Abstract

Paspalum distichum L. was tested to evaluate their phytoremediation capacity for Hg contaminated soil through analyzing the dissipation of Hg in soil through a greenhouse study by using self-made rhizos box. Original soil samples were collected at Hg mining site with serious Hg contamination and a control site, respectively. Planting of P. distichum. L last for 60 days. Soil and plant samples were collected from four periods (0 d, 20 d, 40 d, and 60 d) and soil samples were collected from five different rhizosphere distance in horizontal direction (0–2 cm, 2–4cm, 4–6cm, 6–8cm, 8–10cm). The results showed that the presence of P. distichum. L significantly accelerated the Hg dissipation in soil compared with control. Hg concentration in the rhizospheric soil was affected by the plant growth period and the distance to the plant roots. The closer of soil to the root of P. distichum. L, the lower mercury concentration in soil. During the 60-day growing period, the concentrations of total Hg (THg) and methylmercury (MeHg) reduced by 45% and 64%, respectively, in the rhizosphere (0–2cm) of Hg contaminated soil. However, MeHg concentration was increased near the roots (0–4 cm) during the initial growing period (0–20 d), which may be attributed to the influence of root exudates. Root is the major part for Hg accumulation in P. distichum. L. The low ratio between Hg concentrations in underground and aboveground tissues indicated that it seemed difficult for Hg translocation from root to shoot. The highest THg (9.71 ± 3.09 μg·g-1) and MeHg (26.97 ± 0.98 ng·g-1) value in root of P. distichum. L were observed at the 20th day when P. distichum. L grown in Hg contaminated soil. The results of chemical fractions analyses showed that elemental Hg and residual Hg were the two major speciations followed by organic bound Hg in the Hg contaminated soil, which indicated the high bioavailability and ecological potential risk of Hg in Hg contaminated soil.

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Acknowledgements

Financial support from the Natural Science Foundation of Zhejiang Province (No. LY21D030001) and the National Natural Science Foundation of China (No. 21677131).

Availability of data and materials

All data generated or analyzed during this study are included in this manuscript and its supplementary information files.

Funding

Financial support from the Natural Science Foundation of Zhejiang Province (No. LY21D030001) and the National Natural Science Foundation of China (No. 21677131).

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Authors and Affiliations

  1. School of Environmental and Resource Sciences, Zhejiang A&F University, Lin’an, 311300, Zhejiang Province, China

    Su Xu, Ping Gong, Wen Ding, Shengchun Wu & Peng Liang

  2. Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Lin’an, 311300, Zhejiang Province, China

    Shengchun Wu & Peng Liang

  3. Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhoushan Municipal Center for Disease Control and Prevention, Zhoushan, 316021, China

    Xinwei Yu

Authors
  1. Su Xu
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  2. Ping Gong
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  3. Wen Ding
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  4. Shengchun Wu
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  5. Xinwei Yu
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  6. Peng Liang
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Contributions

Su Xu, Ping Gong, and Wen Ding analyzed and interpreted the data regarding this experiment. Shengchun Wu, Xinwei Yu, and Peng Liang performed the explanation of the results. All authors read and approved the final manuscript.

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Correspondence to Xinwei Yu or Peng Liang.

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Samples of this study only including soil and plant. Therefore, this manuscript did not require the ethical approval.

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Xu, S., Gong, P., Ding, W. et al. Mercury uptake by Paspalum distichum L. in relation to the mercury distribution pattern in rhizosphere soil. Environ Sci Pollut Res 28, 66990–66997 (2021). https://doi.org/10.1007/s11356-021-15093-w

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  • DOI: https://doi.org/10.1007/s11356-021-15093-w

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