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Biogeochemical studies of metal uptake and transportation in plants on an urban brownfield.

机译：城市褐地上植物体内金属吸收和运输的生物地球化学研究。

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摘要

Soil metal contamination has been a concern due to the potential ecological and human health risks. In order to assist with the management and sustainable restoration of vegetated metal contaminated land, this dissertation targets at understanding the biogeochemical processes that control the assimilation of metals by plants on urban costal brownfield soils. The dissertation includes: i) micro-scale measurement of metal spatial distribution and speciation using synchrotron techniques to investigate the mechanism of metal uptake and translocation in roots based on the association between metal localizations in plant roots, ii) study on the biogeochemical factors that control plant metal assimilation efficiency and metal distribution in plan, and iii) environmental assessment of the potential ecological risk of metal contaminated brownfield sites. The micro-scale study of metal uptake and transportation were conducted on the root sections of Typha latifolia L. The results indicated that iron plaque on root surface acted as a barrier for Pb root uptake and a buffer for Zn, Mn and Cu root uptake. The accumulation of Zn, Mn and Cu in the vascular bundles and dermal tissues might follow a similar mechanism. This study also identified metal uptake efficiencies by roots, stems and leaves, which varied with soil pH, soil TOC, metal element, metal concentration, growth season, and plant species. In an evaluation of potential ecological risk of metal contaminated soil, criteria such as geoaccumulation index, enrichment factor, and ecological risk index were applied to assess metal enrichment and divided the contaminated sites into three regions with low, moderate, and high potential ecological risks. Overall, this research investigated the transport and behavior of metals in contaminated land at both the micro and macro scales. Results from this dissertation research could be used as a reference for land management agencies and environmental protection agencies in their decision-making efforts toward sustainable redevelopment and restoration of contaminated land.
机译：由于潜在的生态和人类健康风险，土壤金属污染一直是人们关注的问题。为了帮助管理和可持续恢复植被被金属污染的土地，本论文的目标是了解控制地球沿海褐地土壤上植物对金属同化的生物地球化学过程。论文包括：i）利用同步加速器技术对植物的金属空间分布和形态进行微观测量，以基于植物根部金属定位之间的联系，研究根中金属的吸收和转运机制； ii）研究控制植物根系的生物地球化学因素。计划中的植物金属同化效率和金属分布，以及iii）对金属污染的棕地场址的潜在生态风险进行环境评估。对香蒲的根部进行了金属吸收和转运的微观研究。结果表明，根表面的铁斑块是Pb根吸收的障碍和Zn，Mn和Cu根吸收的缓冲剂。锌在血管束和真皮组织中的积累可能遵循类似的机制。这项研究还确定了根，茎和叶对金属的吸收效率，这些效率随土壤pH，土壤TOC，金属元素，金属浓度，生长季节和植物种类而变化。在评估金属污染土壤的潜在生态风险时，采用了地积累指数，富集因子和生态风险指数等标准来评估金属富集程度，并将受污染的地点划分为低，中和高潜在生态风险的三个区域。总体而言，这项研究从微观和宏观两个角度调查了污染土地中金属的运输和行为。论文的研究结果可为土地管理部门和环境保护部门在可持续发展和污染土地恢复方面的决策提供参考。

著录项

  • 作者

    Qian, Yu.;

  • 作者单位

    Montclair State University.;

  • 授予单位 Montclair State University.;
  • 学科 Environmental management.;Biogeochemistry.;Environmental science.;Ecology.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 286 p.
  • 总页数 286
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

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