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首页> 外文期刊>Environmental Science & Technology >Evidence of a Novel Mechanism of Semivolatile Organic Compound Deposition in Coniferous Forests
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Evidence of a Novel Mechanism of Semivolatile Organic Compound Deposition in Coniferous Forests

机译：针叶林半挥发性有机化合物沉积新机制的证据

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摘要

Atmospheric transport and subsequent deposition of semivolatile organic compounds (SOCs) like PAHs, PCBs, and PCDD/Fs are the processes primarily responsible for the ubiquitous presence of these compounds in the biosphere. While vegetation is known to accumulate these compounds and to be the most important vector for atmospheric SOCs into agricultural food chains, the broader role of vegetation in scavenging SOCs from the atmosphere and the consequences for accumulation in soil have not been extensively investigated. Soils contain the vast majority of persistent SOCs present in the terrestrial environment. Furthermore, forest soils have been found to contain higher levels of SOC than agricultural or grassland soils sampled in the same region . For example, Hagenmaier and Krauss found that forest soils in southwestern Germany contain on average three times more PCDD/Fs [expressed as toxicity equivalents (TE)] per square meter man agricultural soils. Because of the absence of other sources, atmospheric deposition to forest soils must be much larger than to agricultural soils. Hagenmaier and Krauss reported that two-thirds of the total environmental inventory of PCDD/Fs in southwestern Germany is present in forest soils. This implies mat the processes responsible for the higher rates of deposition to forest soils are of critical importance to the environmental fate of SOCs. In this paper, we report on an experiment designed to explore the role of deposition processes in the accumulation of PCDD/Fs in forest soils.
机译：大气传输和随后的半挥发性有机化合物（SOC）（如PAH，PCB和PCDD / F）的沉积是造成这些化合物在生物圈中普遍存在的主要过程。尽管已知植被会积累这些化合物，并且是大气SOC进入农业食物链的最重要载体，但尚未广泛研究植被在从大气中清除SOC方面的广泛作用以及在土壤中积累的后果。土壤包含地球环境中存在的绝大多数持久性有机碳。此外，已发现森林土壤中的SOC含量高于在同一地区采样的农业或草地土壤中的SOC。例如，哈根迈耶（Hagenmaier）和克劳斯（Krauss）发现，德国西南部的森林土壤每平方米人用农业土壤平均含有多于三倍的PCDD / Fs（以毒性当量（TE）表示）。由于没有其他来源，森林土壤的大气沉降必须比农业土壤大得多。 Hagenmaier和Krauss报告说，德国西南部PCDD / Fs环境总清单的三分之二存在于森林土壤中。这意味着导致森林土壤更高沉积速率的过程对SOC的环境命运至关重要。在本文中，我们报告了一项旨在探索沉积过程在森林土壤中PCDD / Fs积累中的作用的实验。

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  • 来源
    《Environmental Science & Technology》 |1996年第5期|p.1794-1796|共3页
  • 作者

    MICHAEL HORSTMANN; MICHAEL S. MCLACHLAN;

  • 作者单位

    Ecological Chemistry and Geochemistry, University of Bayreuth, 95440 Bayreuth, Germany;

  • 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 环境化学;
  • 关键词

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