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首页> 外文期刊>Environmental Pollution >Protozoan predation in soil slurries compromises determination of contaminant mineralization potential
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Protozoan predation in soil slurries compromises determination of contaminant mineralization potential

机译：泥浆中的原生动物捕食会影响污染物矿化潜力的确定

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摘要

Soil suspensions (slurries) are commonly used to estimate the potential of soil microbial communities to mineralize organic contaminants. The preparation of soil slurries disrupts soil structure, however, potentially affecting both the bacterial populations and their protozoan predators. We studied the importance of this "slurry effect" on mineralization of the herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA, ~(14)C-labelled), focussing on the effects of protozoan predation. Mineralization of MCPA was studied in "intact" soil and soil slurries differing in soil:water ratio, both in the presence and absence of the protozoan activity inhibitor cycloheximide. Protozoan predation inhibited mineralization in dense slurry of subsoil (soil:water ratio 1:3), but only in the most dilute slurry of topsoil (soil: water ratio 1:100). Our results demonstrate that protozoan predation in soil slurries may compromise quantification of contaminant mineralization potential, especially when the initial density of degrader bacteria is low and their growth is controlled by predation during the incubation period.
机译：土壤悬浮液（泥浆）通常用于估算土壤微生物群落矿化有机污染物的潜力。土壤泥浆的制备会破坏土壤结构，但是，可能会影响细菌种群及其原生动物的捕食者。我们研究了这种“浆液效应”对除草剂2-甲基-4-氯苯氧基乙酸（MCPA，〜（14）C标记）矿化的重要性，重点是原生动物捕食的影响。在存在和不存在原生动物活性抑制剂环己酰亚胺的情况下，在“完整的”土壤和土壤/水比例不同的泥浆中研究了MCPA的矿化作用。原生动物的捕食抑制了在深层土壤（土壤：水的比例为1：3）中的矿化作用，但仅在最稀薄的表层土壤（土壤：水的比例为1：100）中抑制了矿化作用。我们的结果表明，土壤浆液中的原生动物捕食可能会损害污染物矿化潜力的量化，特别是当降解细菌的初始密度较低且其生长在孵化期受到捕食控制时。

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  • 来源
    《Environmental Pollution》 |2012年第11期|p.32-38|共7页
  • 作者

    Nora Badawi; Anders R. Johnsen; Kristian K. Brandt; Jan Sorensen; Jens Aamand;

  • 作者单位

    Department of Geochemistry, Geological Survey of Denmark and Greenland, Φster Voldgade 10, DK-1350 Copenhagen K, Denmark,Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    Department of Geochemistry, Geological Survey of Denmark and Greenland, Φster Voldgade 10, DK-1350 Copenhagen K, Denmark;

    Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;

    Department of Geochemistry, Geological Survey of Denmark and Greenland, Φster Voldgade 10, DK-1350 Copenhagen K, Denmark;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cycloheximide; protozoan inhibition; small volume samples; MCPA; MPN;

    机译：环己酰亚胺原生动物抑制;少量样品;MCPA;MPN;

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