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首页> 外文期刊>Environmental Science & Technology >Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests
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Measurement of the Vertical Distribution of Gaseous Elemental Mercury Concentration in Soil Pore Air of Subtropical and Temperate Forests

机译：亚热带温带森林土壤孔隙空气中气态元素汞浓度垂直分布的测量

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摘要

Solid-gas-water phase partitioning of mercury (Hg) and the processes governing its diffiisivity within soils are poorly studied. In this study, landscape and forest species dependences of gaseous elemental Hg (Hg(0)) in soil profiles (0-50 cm) were investigated over four seasons in eight subtropical (130 days) and temperate (96 days) forest plots. The vertical soil pore Hg(0) concentrations differed between subtropical (Masson pine, broad-leaved forest, and open field) and temperate (Chinese pine, larch, mixed broad-leaf forests, and open field) catchments, with annual averages ranging from 6.73 to 15.8 and 0.95 to 2.08 ng m~(-3)respectively. The highest Hg(0) concentrations in soil gas consistently occurred in the upper mineral or organic horizons, indicating immobilization of Hg(0) in mineral soils. A strongly positive relationship between pore Hg(0) concentrations and ratios of Hg to organic matter (SOM) in soils suggests that the vertical distribution of Hg(0) is related to soil Hg(0) formation by Hg(Ⅱ) reduction and sorption to SOM. Temperature was also an important driver of Hg(0) production in soil pores. Based on measurements of soil-air Hg(0) exchange, diffusion coefficients (D_s) of Hg(0) between soil and atmosphere were calculated for field sites, providing a foundation for future development and validation of terrestrial Hg models.
机译：汞（Hg）的固 - 水 - 水相分配和治疗其在土壤中的差异性的过程差异很差。在本研究中，在八个亚热带（130天）和温带温带（96天）森林地块中，在土壤曲线（0-50厘米）中的气态元素Hg（0-50厘米）的景观和森林物种依赖于四季（0-50厘米）。垂直土孔Hg（0）浓度不同于亚热带（Masson Pine，阔叶林和开放场）和温带温带（中国松，落叶松，混合叶片森林和开放场）集水区，年平均值范围从6.73至15.8和0.95至2.08 ng m〜（-3）。土壤气体中最高的Hg（0）浓度在上矿物质或有机视野中始终发生，表明在矿物质土壤中固定Hg（0）。孔隙Hg（0）浓度和Hg对有机物质的比率（Som）之间的强烈阳性关系表明，Hg（0）的垂直分布与Hg（Ⅱ）还原和吸附的土壤Hg（0）形成有关到索姆。温度也是土壤毛孔中Hg（0）生产的重要驾驶员。基于土壤 - 空气HG（0）交换的测量，对土壤和大气之间的汞（0）的扩散系数（d_s）进行了用于现场场地，为未来的发展和验证陆地HG模型提供基础。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|2132-2142|共11页
  • 作者

    Jun Zhou; Zhangwei Wang; Xiaoshan Zhang; Charles T. Driscoll;

  • 作者单位

    State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China Department of Environmental Earth and Atmospheric Sciences University of Massachusetts Lowell Massachusetts 01854 United States;

    State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China;

    Department of Civil and Environmental Engineering Syracuse University Syracuse New York 13244 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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