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Phytostabilization of Cd and Pb in Highly Polluted Farmland Soils Using Ramie and Amendments

Author

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  • Mo-Ming Lan

    (School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China)

  • Chong Liu

    (School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China)

  • Shi-Jiao Liu

    (School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China)

  • Rong-Liang Qiu

    (School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
    Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou 510275, China)

  • Ye-Tao Tang

    (School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
    Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou 510275, China)

Abstract

In-situ remediation of heavy-metal-contaminated soil in farmland using phytostabilization combined with soil amendments is a low-cost and effective technology for soil pollution remediation. In this study, coconut shell biochar (CB, 0.1% and 0.5%), organic fertilizer (OF, 3.0%), and Fe-Si-Ca material (IS, 3.0%) were used to enhance the phytostabilization effect of ramie ( Boehmeria nivea L.) on Cd and Pb in highly polluted soils collected at Dabaoshan (DB) and Yangshuo (YS) mine sites. Results showed that simultaneous application of CB, OF, and IS amendments (0.1% CB + 3.0% OF + 3.0% IS and 0.5% CB + 3.0% OF + 3.0% IS, DB-T5 and DB-T6) could significantly increase soil pH, reduce the concentrations of CaCl 2 -extractable Cd and Pb, and increase the contents of Ca, P, S, and Si in DB soil. Under these two treatments, the growth of ramie was significantly improved, its photosynthesis was enhanced, and its levels of Cd and Pb were reduced, in comparison with the control (DB-CK). After applying DB-T5 and DB-T6, the concentrations of Cd and Pb in roots were decreased by 97.7–100% and 64.6–77.9%, while in shoots they were decreased by up to 100% and 92.9–100%, respectively. In YS-T4 (0.5% CB + 3.0% OF), the concentrations of Cd and Pb in roots were decreased by 39.5% and 46.0%, and in shoots they were decreased by 44.7% and 88.3%. We posit that phytostabilization using ramie and amendments could reduce the Cd and Pb bioavailability in the soil mainly through rhizosphere immobilization and plant absorption. In summary, this study suggests that the use of tolerant plant ramie and simultaneous application of coconut shell biochar, organic fertilizer, and Fe-Si-Ca materials is an effective stabilization strategy that can reduce Cd and Pb availabilities in soil. Ultimately, this strategy may reduce the exposure risk of crops to heavy metal pollution in farmland.

Suggested Citation

  • Mo-Ming Lan & Chong Liu & Shi-Jiao Liu & Rong-Liang Qiu & Ye-Tao Tang, 2020. "Phytostabilization of Cd and Pb in Highly Polluted Farmland Soils Using Ramie and Amendments," IJERPH, MDPI, vol. 17(5), pages 1-12, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:5:p:1661-:d:328197
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    References listed on IDEAS

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    1. Lige Huang & Yuanyuan Li & Man Zhao & Yuanqing Chao & Rongliang Qiu & Yanhua Yang & Shizhong Wang, 2018. "Potential of Cassia alata L. Coupled with Biochar for Heavy Metal Stabilization in Multi-Metal Mine Tailings," IJERPH, MDPI, vol. 15(3), pages 1-15, March.
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    Cited by:

    1. Changming Li & Tianpeng Gao & Xueying Wang & Shipeng Qu & Yingli Yang & Mingbo Zuo & Juan Wang & Haoming Wang & Guixiang Zhou & Yubing Liu, 2022. "Phytoremediation Potential and Physiological Mechanisms Underlying Metallic Extraction of Suaeda glauca , Artemisia desertorum , and Atriplex canescens," IJERPH, MDPI, vol. 19(23), pages 1-14, November.

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