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    Author(s): Jiaxin Wang; Xuening Lu; Jiaen Zhang; Ying Ouyang; Guangchang Wei; Yue Xiong
    Date: 2020
    Source: Journal of Hazardous Materials
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (3.0 MB)

    Description

    Phytoremediation has been employed as a cost-effective technique to remove the cadmium (Cd) from soil and
    water in several ecosystems. However, little is known about whether intercropping the remediating plants with
    rice (Oryza sativa) crop could reduce Cd accumulation in rice grains. We conducted greenhouse pot and concrete
    pond trials to explore the effects of intercropping alligator flag (Thalia dealbata, Marantaceae) on soil Cd remediation,
    paddy soil and microbial properties, and rice production. Our results suggest that intercropping with
    alligator flag significantly decreased Cd absorption, transportation, and accumulation from the soil to the rice
    grains (under 0.2 mg kg–1 at a soil Cd content below 2.50 mg kg–1). This decrease was due to the lowered Cd
    availability and higher soil pH in the rice-alligator flag intercropping system. Although planting alligator flag
    resulted in the reduction of soil NH4-N and NO3-N, Cd content in the rhizosphere was the main factor restricting
    microbial biomass, species, and community composition. Alligator flag could tolerate higher Cd contamination, and accumulate and stabilize more Cd in its tissues than rice. Our study suggests that alligator flag intercropped
    with rice has potential as a phytostabilization plant to produce rice safely for human consumption in moderately
    Cd-contaminated soils.

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    Citation

    Wang, Jiaxin; Lu, Xuening; Zhang, Jiaen; Ouyang, Ying; Wei, Guangchang; Xiong, Yue. 2020. Rice intercropping with alligator flag (Thalia dealbata): A novel model to produce safe cereal grains while remediating cadmium contaminated paddy soil. Journal of Hazardous Materials. 394: 122505-. https://doi.org/10.1016/j.jhazmat.2020.122505.

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    Keywords

    Heavy metal pollution, Phytostabilization, Phytoremediation, Oryza sativa, Fe plaque

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https://www.fs.usda.gov/treesearch/pubs/60642