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Unique Organic Matter and Microbial Properties in the Rhizosphere of a Wetland Soil

机译：湿地土壤根际的独特有机物和微生物特性

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摘要

Wetlands attenuate the migration of many contaminants through a wide range of biogeochemical reactions. Recent research has shown that the rhizosphere, the zone near plant roots, in wetlands is especially effective at promoting contaminant attenuation. The objective of this study was to compare the soil organic matter (OM) composition and microbial communities of a rhizosphere soil (primarily an oxidized environment) to that of the bulk wetland soil (primarily a reduced environment). The rhizosphere had elevated C, N, Mn, and Fe concentrations and total bacteria, including Anacromyxobacter, counts (as identified by qPCR). Furthermore, the rhizosphere contained several organic molecules that were not identified in the nonrhizosphere soil (54% of the ＞2200 ESI-FTICR-MS identified compounds). The rhizosphere OM molecules generally had (1) greater overall molecular weights, (2) less aromaticity, (3) more carboxylate and N-containing COO functional groups, and (4) a greater hydrophilic character. These latter two OM properties typically promote metal binding. This study showed for the first time that not only the amount but also the molecular characteristics of OM in the rhizosphere may in part be responsible for the enhanced immobilization of contaminants in wetlands. These finding have implications on the stewardship and long-term management of contaminated wetlands.
机译：湿地通过广泛的生物地球化学反应减弱了许多污染物的迁移。最近的研究表明，湿地植物根部附近的根际区域在促进污染物衰减方面特别有效。这项研究的目的是比较根际土壤（主要是氧化环境）与散装湿地土壤（主要是还原环境）的土壤有机质（OM）组成和微生物群落。根际中的C，N，Mn和Fe浓度升高，细菌总数（包括副黏杆菌）计数（通过qPCR鉴定）。此外，根际含有非根际土壤中未发现的几种有机分子（＞ 2200 ESI-FTICR-MS鉴定出的化合物中有54％）。根际的OM分子通常具有（1）较高的总分子量，（2）较低的芳香性，（3）较多的羧酸盐和含N的COO官能团，以及（4）较大的亲水性。后两种OM特性通常促进金属结合。这项研究首次表明，不仅根际中OM的含量而且其分子特性可能部分归因于湿地中污染物的固定化增强。这些发现对受污染湿地的管理和长期管理具有影响。

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  • 来源
    《Environmental Science & Technology》 |2016年第8期|4169-4177|共9页
  • 作者

    Daniel I. Kaplan; Chen Xu; Shan Huang; Youmin Lin; Nikola Tolic; Kristyn M. Roscioli-Johnson; Peter H. Santschi; Peter R. Jaffe;

  • 作者单位

    Savannah River National Laboratory, Aiken, South Carolina 29808, United States;

    Texas A&M University, Galveston, Texas 77553, United States;

    Princeton University, Princeton, New Jersey 08540, United States;

    Texas A&M University, Galveston, Texas 77553, United States;

    Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States;

    Idaho National Laboratory, Idaho Falls, Idaho 83415, United States;

    Texas A&M University, Galveston, Texas 77553, United States;

    Princeton University, Princeton, New Jersey 08540, 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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