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    Phytostabilization of mine tailings using compost-assisted direct planting: Translating greenhouse results to the field

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    Name:
    Phytostabilization_of_Mine_Tai ...
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    Description:
    Final Accepted Manuscript
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    Author
    Gil-Loaiza, Juliana
    White, Scott A
    Root, Robert A
    Solís-Dominguez, Fernando A
    Hammond, Corin M
    Chorover, Jon cc
    Maier, Raina M
    Affiliation
    Univ Arizona, Dept Soil Water & Environm Sci
    Issue Date
    2016-09-15
    Keywords
    Direct planting
    Fertility islands
    Mine tailings
    Phytoremediation
    Phytostabilization
    
    Metadata
    Show full item record
    Publisher
    ELSEVIER SCIENCE BV
    Citation
    Gil-Loaiza, J., White, S. A., Root, R. A., Solís-Dominguez, F. A., Hammond, C. M., Chorover, J., & Maier, R. M. (2016). Phytostabilization of mine tailings using compost-assisted direct planting: Translating greenhouse results to the field. Science of the Total Environment, 565, 451-461.
    Journal
    SCIENCE OF THE TOTAL ENVIRONMENT
    Rights
    © 2016 Elsevier B.V. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Standard practice in reclamation of mine tailings is the emplacement of a 15 to 90 cm soil/gravel/rock cap which is then hydro-seeded. In this study we investigate compost-assisted direct planting phytostabilization technology as an alternative to standard cap and plant practices. In phytostabilization the goal is to establish a vegetative cap using native plants that stabilize metals in the root zone with little to no shoot accumulation. The study site is a barren 62-hectare tailings pile characterized by extremely acidic pH as well as lead, arsenic, and zinc each exceeding 2000 mg kg(-1). The study objective is to evaluate whether successful greenhouse phytostabilization results are scalable to the field. In May 2010, a 0.27 ha study area was established on the Iron King Mine and Humboldt Smelter Superfund (IKMHSS) site with six irrigated treatments; tailings amended with 10, 15, or 20% (w/w) compost seeded with amix of native plants (buffalo grass, arizona fescue, quailbush, mountain mahogany, mesquite, and catclaw acacia) and controls including composted (15 and 20%) unseeded treatments and an uncomposted unseeded treatment. Canopy cover ranging from 21 to 61% developed after 41 months in the compost-amended planted treatments, a canopy cover similar to that found in the surrounding region. No plants grew on unamended tailings. Neutrophilic heterotrophic bacterial counts were 1.5 to 4 orders of magnitude higher after 41 months in planted versus unamended control plots. Shoot tissue accumulation of various metal(loids) was at or below Domestic Animal Toxicity Limits, with some plant specific exceptions in treatments receiving less compost. Parameters including % canopy cover, neutrophilic heterotrophic bacteria counts, and shoot uptake of metal(loids) are promising criteria to use in evaluating reclamation success. In summary, compost amendment and seeding, guided by preliminary greenhouse studies, allowed plant establishment and sustained growth over 4 years demonstrating feasibility for this phytostabilization technology. (C) 2016 Elsevier B.V. All rights reserved.
    Note
    24 month embargo; published online: 13 May 2016
    ISSN
    1879-1026
    PubMed ID
    27183459
    DOI
    10.1016/j.scitotenv.2016.04.168
    Version
    Final accepted manuscript
    Sponsors
    NIEHS Superfund Research Program [2 P42 ES04940]
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0048969716308701?via%3Dihub
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.scitotenv.2016.04.168
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