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首页> 外文期刊>Environmental Science & Technology >Fractions Transformation and Dissipation Mechanism of Dechlorane Plus in the Rhizosphere of the Soil-Plant System
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Fractions Transformation and Dissipation Mechanism of Dechlorane Plus in the Rhizosphere of the Soil-Plant System

机译：脱氯加入在土壤植物系统根际馏分转化及耗散机制

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摘要

The fractions transformation and dissipation mechanism of Dechlorane Plus (DP) in the rhizosphere of soil-plant system were investigated and characterized by a 150-day experiment using a rhizobox system. The depuration, accumulation, and translocation of DP in rice plants were observed. The contributions of plant uptake, microbial degradation, and bound-residue formation to DP dissipation under the rhizosphere effect were modeled and quantified. The gradients of DP concentrations correlated well with microbial biomass in the rhizosphere (R~2 = 0.898). The rhizosphere facilitated the bioavailability of DP (excitation) and modified the bound-residue formation of DP (aging). DP concentrations in roots were positively correlated with the labile fraction of DP in soil (R~2 = 0.852-0.961). There were spatiotemporal variations in the DP fractions. Dissolved and soil organic carbon were important influences on fraction transformation. Contributions to total DP dissipation were in the following ranges: microbial degradation (8.33-54.14%), bound-residue formation (3.64-16.43%), and plant uptake (0.54-3.85%). With all of these processes operating, the half-life of DP in the rhizosphere was 105 days. The stereoselectivity of DP isomers in both rice and DP fractions in soil were observed, suggesting a link between stereoselective bioaccumulation of DP in terrestrial organisms and dissipation pathways in soil.
机译：研究了土壤 - 植物系统根际（DP）在土壤 - 植物系统根际的级分转化和耗散机制，并采用Rhizobox系统进行了150天的实验。观察到DP在水稻植物中的钙，积累和易位。模拟和量化植物摄取，微生物降解和结合残基形成对DP耗散的贡献。 DP浓度的梯度与根际中的微生物生物量相关（R〜2 = 0.898）。根际促进了DP（激发）的生物利用度，并改性了DP（老化）的结合残留物形成。根系中的DP浓度与土壤中DP的不稳定部分正相关（R〜2 = 0.852-0.961）。 DP级分有时态变化。溶解和土壤有机碳是对级分转化的重要影响。对总DP耗散的贡献在以下范围内：微生物降解（8.33-54.14％），含余残留物形成（3.64-16.43％）和植物摄取（0.54-3.85％）。随着所有这些过程运行，根际DP的半衰期为105天。观察到土壤中水稻和DP分数中DP异构体的立体选择性，表明DP在土壤中DP的立体选择性生物累积与土壤中的耗散途径的联系。

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  • 来源
    《Environmental Science & Technology》 |2020年第11期|6610-6620|共11页
  • 作者

    Yu Cheng; Jue Ding; Xiuyu Liang; Xiaowen Ji; Ling Xu; Xianchuan Xie; You-Kuan Zhang;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse School of Earth Sciences and Engineering School of the Environment Nanjing University Nanjing 210023 P. R. China;

    College of Environment Hohai University Nanjing 210098 P. R. China;

    State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China;

    State Key Laboratory of Pollution Control and Resource Reuse School of Earth Sciences and Engineering School of the Environment Nanjing University Nanjing 210023 P. R. China;

    Nanjing Innovation Center for Environmental Protection Industry Company Limited Nanjing 210042 P. R. China;

    State Key Laboratory of Pollution Control and Resource Reuse School of Earth Sciences and Engineering School of the Environment Nanjing University Nanjing 210023 P. R- China Nanjing Innovation Center for Environmental Protection Industry Company Limited Nanjing 210042 P. R. China;

    State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China;

  • 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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