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首页> 外文学位 >Enhanced bioremediation of waterlogged soil contaminated with phenanthrene and pyrene using wetland plant and PAH-degrading bacteria.
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Enhanced bioremediation of waterlogged soil contaminated with phenanthrene and pyrene using wetland plant and PAH-degrading bacteria.

机译：使用湿地植物和降解PAH的细菌增强对被菲和pyr污染的涝渍土壤的生物修复。

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摘要

The present study aims to investigate the interactions of PAH-degrading bacteria (Acinetobacter sp.) and higher plant (Oryza sativa L.) on enhancing bioremediation of PAH-contaminated waterlogged soil.;The growth of Oryza sativa was adversely affected by 200+200 mg kg -1 phenanthrene (PHE) and pyrene (PYR), with significant decreases of chlorophyll content and shoot and root biomass. Oryza sativa was able to regulate the elevation of superoxide dismutase (SOD) activities and water-soluble protein (WSP) content to counteract the intracellular overproduction of reactive oxygen species (ROS) under PAH stress. Acinetobacter sp. alleviated the toxic effects caused by PAHs on rice growth, and even stimulated the growth of rice by increasing its chlorophyll content and biomass. Addition of Oryza sativa root exudates or extracts stimulated the growth of Acinetobacter sp. substantially on the mixtures of PHE and PYR in both liquid cultures and waterlogged soil, which may be beneficial to maintaining Acinetobacter sp. population during the remediation process.;In soil microcosms containing Oryza sativa and Acinetobacter sp., interactions between Oryza sativa and Acinetobacter sp. greatly accelerated the dissipation of PYR from waterlogged soil, when compared with microcosms containing Oryza sativa or Acinetobacter sp. alone. In addition to stimulating microbial degradation of PAHs, Oryza sativa would also enhance PAH dissipation through elevating peroxidase activities in soil. Root exudates contributed to the formation of dissipation gradients of PHE and PYR along vertical directions of roots, with the highest dissipation in the rhizosphere and near rhizosphere zone. Dissolved organic carbon (DOC) was one of the major factors affecting PAHs dissipation rates of soil in rhizosphere and near rhizosphere zone. In addition to providing a favorable rhizosphere environment for PAH degradation, Oryza sativa roots accumulated PHE and PYR through adsorption and absorption. Using a sequential extraction method, it was found that PAHs were more easily absorbed into the interior rice roots than being adsorbed on root surface. Butanol-extractable PHE and PYR in rhizospheric soil were significantly (p0.05) correlated with their corresponding concentrations in rice roots, indicating the feasibility of using butanol-extractable PAHs for estimating availability of PAHs.;The present results indicated that there is a potential for developing a plant-assisted bioremediation system containing PAH-degrading bacteria and wetland plant to clean up PAHs-contaminated waterlogged soil.
机译：本研究旨在研究降解PAH的细菌（不动杆菌属）和高等植物（Oryza sativa L.）在增强PAH污染的淹水土壤生物修复方面的相互作用。200 + 200对水稻的生长产生不利影响毫克公斤-1菲（PHE）和pyr（PYR），但叶绿素含量以及枝条和根生物量显着降低。水稻能够调节超氧化物歧化酶（SOD）活性和水溶性蛋白（WSP）含量的升高，以抵消PAH胁迫下细胞内活性氧（ROS）的过度生产。不动杆菌属减轻了PAHs对水稻生长的毒性作用，甚至通过增加其叶绿素含量和生物量刺激了水稻的生长。水稻根系分泌物或提取物的添加刺激了不动杆菌的生长。在液体培养和浸水的土壤中，基本上都是PHE和PYR的混合物，这可能有利于维持不动杆菌属。在包含稻和不动杆菌的土壤微观世界中，稻和不动杆菌之间的相互作用。与含有水稻或不动杆菌属的缩影相比，大大加快了水淹土壤中PYR的消散。单独。除了刺激微生物降解多环芳烃外，水稻还可以通过提高土壤中的过氧化物酶活性来增强多环芳烃的消散。根系分泌物有助于根系垂直方向上PHE和PYR的消散梯度的形成，在根际和根际附近的消散率最高。可溶性有机碳（DOC）是影响根际及根际附近土壤中PAHs消散率的主要因素之一。除了为PAH降解提供良好的根际环境外，水稻的根还通过吸附和吸收积累了PHE和PYR。使用顺序提取方法，发现PAHs比在根表面的吸附更容易吸收到水稻内部。根际土壤中丁醇可萃取的PHE和PYR与它们在稻根中的相应浓度显着相关（p <0.05），这表明使用丁醇可萃取的PAHs估算PAHs的可行性。用于开发一种植物辅助的生物修复系统，该系统包含降解多环芳烃的细菌和湿地植物，以清除受多环芳烃污染的涝渍土壤。

著录项

  • 作者

    Gao, Yan.;

  • 作者单位

    Hong Kong Baptist University (Hong Kong).;

  • 授予单位 Hong Kong Baptist University (Hong Kong).;
  • 学科 Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;
  • 关键词

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