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Field crops (Ipomoea aquatica Forsk. and Brassica chinensis L.) for phytoremediation of cadmium and nitrate co-contaminated soils via rotation with Sedum alfredii Hance

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Abstract

Phytoremediation coupled with crop rotation (PCC) is a feasible strategy for remediation of contaminated soil without interrupting crop production. The objective of this study was to develop a PCC technology system for greenhouse fields co-contaminated with Cd and nitrate using hyperaccumulator Sedum alfredii. In this system, endophytic bacterium M002 inoculation, CO2 fertilization, and fermentation residue were continuously applied to improve the growth of S. alfredii, and low-accumulator Ipomoea aquatica and low-accumulator Brassica chinensis were rotated under reasonable water management. These comprehensive management practices were shown to increase S. alfredii biomass and Cd uptake and reduce Cd and nitrate concentration in I. aquatica and B. chinensis. This crop rotating system could remove 56.5% total Cd, 62.3% DTPA extractable Cd, and 65.4% nitrate, respectively, from the co-contaminated soil in 2 years of phytoremediation, and is an effective way of remediating moderately co-contaminated soil by Cd and nitrate.

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Acknowledgments

This study was financially supported by the Key Projects from Ministry of Science and Technology of China (#2016YFD0800805), Zhejiang Provincial Science and Technology Bureau (#2015C02011-3; #2015C03020-2), and from the Fundamental Research Funds for the Central University.

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  1. Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People’s Republic of China

    Lin Tang, Weijun Luo, Weikang Chen, Hanumanth Kumar Gurajala, Yasir Hamid, Meihua Deng & Xiaoe Yang

  2. Institute of Food and Agricultural Sciences, Indian River Research and Education Center, University of Florida, Fort Pierce, Florida, 34945, USA

    Zhenli He

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  1. Lin Tang
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  2. Weijun Luo
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Tang, L., Luo, W., Chen, W. et al. Field crops (Ipomoea aquatica Forsk. and Brassica chinensis L.) for phytoremediation of cadmium and nitrate co-contaminated soils via rotation with Sedum alfredii Hance. Environ Sci Pollut Res 24, 19293–19305 (2017). https://doi.org/10.1007/s11356-017-9146-7

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