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首页> 外文期刊>Environmental Science & Technology >Response of Key Soil Parameters during Compost-Assisted Phytostabilization in Extremely Acidic Tailings: Effect of Plant Species
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Response of Key Soil Parameters during Compost-Assisted Phytostabilization in Extremely Acidic Tailings: Effect of Plant Species

机译：极端酸性尾矿堆肥辅助植物稳定过程中关键土壤参数的响应：植物物种的影响

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摘要

Phytostabilization of mine tailings acts to mitigate both eolian dispersion and water erosion events which can disseminate barren tailings over large distances. This technology uses plants to establish a vegetative cover to permanently immobilize contaminants in the rooting zone, often requiring addition of an amendment to assist plant growth. Here we report the results of a greenhouse study that evaluated the ability of six native plant species to grow in extremely acidic (pH ~ 2.5) metalliferous (As, Pb, Zn: 2000-3000 mg kg~(-1)) mine tailings from Iron King Mine Humboldt Smelter Superfund site when amended with a range of compost concentrations. Results revealed that three of the six plant species tested (buffalo grass, mesquite, and catclaw acacia) are good candidates for phytostabilization at an optimum level of 15% compost (w/w) amendment showing good growth and minimal shoot accumulation of metal(loid)s. A fourth candidate, quailbush, also met all criteria except for exceeding the domestic animal toxicity limit for shoot accumulation of zinc. A key finding of this study was that the plant species that grew most successfully on these tailings significantly influenced key tailings parameters; direct correlations between plant biomass and both increased tailings pH and neutrophilic heterotrophic bacterial counts were observed. We also observed decreased iron oxidizer counts and decreased bioavailabihty of metal(loid)s mainly as a result of compost amendment. Taken together, these results suggest that the phytoslabilization process reduced tailings toxicity as well as the potential for metal(loid) mobilization. This study provides practical information on plant and tailings characteristics that is critically needed for successful implementation of assisted phytostabilization on acidic, metalliferous mine tailings sites.
机译：矿山尾矿的植物稳定作用可减轻风成岩的分散和水蚀事件的发生，这些事件可在较远的距离散布贫瘠的尾矿。该技术利用植物来建立植物覆盖物，以将污染物永久地固定在生根区，通常需要添加修饰剂以帮助植物生长。在这里，我们报告了一项温室研究的结果，该研究评估了六种本地植物在极酸性（pH〜2.5）含金属（As，Pb，Zn：2000-3000 mg kg〜（-1））矿山尾矿中生长的能力。修改了一系列堆肥浓度后，对铁王矿洪堡冶炼厂超级基金进行了改造。结果表明，所测试的六个植物物种中的三个（水牛草，豆科灌木和长爪金合欢）是植物稳定化的最佳候选者，堆肥（w / w）修正值的最佳水平为15％，表现出良好的生长且金属（胶体）的芽蓄积最少）s。第四个候选者，鹌鹑，除满足家畜对锌枝条积累的毒性限制外，还符合所有标准。这项研究的关键发现是，在这些尾矿上最成功生长的植物物种对关键尾矿参数产生了显着影响。观察到植物生物量与尾矿pH值升高和嗜中性异养细菌数均直接相关。我们还观察到铁氧化剂数量的减少和金属（金属）的生物利用度的降低主要是由于堆肥的改良。综上所述，这些结果表明，植物鳞茎化过程降低了尾矿的毒性以及金属（胶体）动员的潜力。这项研究提供了有关植物和尾矿特性的实用信息，这对于在酸性，含金属矿山尾矿站点成功实施辅助植物稳定至关重要。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.1019-1027|共9页
  • 作者

    Fernando A. Solis-Dominguez; Scott A. White; Travis Borrillo Hutter; Mary Kay Amistadi; Robert A. Root; Jon Chorover; Raina M. Maier;

  • 作者单位

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

    Department of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, Tucson, Arizona 85721, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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