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首页> 外文期刊>Environmental Science & Technology >Empirical Models for Estimating Mercury Flux from Soils
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Empirical Models for Estimating Mercury Flux from Soils

机译：估算土壤中汞通量的经验模型

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摘要

Multiple parameters have been suggested to influence the exchange of mercury (Hg) between the atmosphere and soils. However, models applied for estimating soil Hg flux are simple and do not consider the potential synergistic and antagonist relationships between factors controlling the exchange. This study applied a two-level factorial experimental design in a gas exchange chamber (GEC) to investigate the individual and combined effects of three environmental factors (temperature, light and soil moisture) on soil Hg flux. It was shown that individually irradiation, soil moisture, and air temperature all significantly enhance Hg evasive flux (by 90-140%). Synergistic effects (20-30% of additional flux enhancement) were observed for all two-factor interactions, with airtemperature/soil moisture and air temperature/irradiation being the most significant Results from the factorial experiments suggest that a model incorporating the second-order interactions can appropriately explain the flux response to the changes of the studied factors. Based on the factorial experiment results and using the flux data for twelve soil materials measured with a dynamic flux chamber (DFC) at various temperatures, soil moisture contents, solar radiation exposures, and soil Hg contents, two empirical models for estimating Hg flux from soils were developed. Model verification with ambient flux data not used to develop the models suggested that the models were capable of estimating dry soil Hg flux with a high degree of predictability (r～0.9).
机译：已经提出了多个参数来影响大气与土壤之间汞（Hg）的交换。但是，用于估算土壤汞通量的模型很简单，没有考虑控制交换的因素之间潜在的协同和拮抗关系。这项研究在气体交换室（GEC）中应用了两级析因实验设计，以研究三种环境因素（温度，光照和土壤湿度）对土壤汞通量的单独影响和综合影响。结果表明，单独照射，土壤湿度和空气温度都显着提高了汞逸出通量（提高了90-140％）。在所有两因素相互作用中均观察到协同效应（额外的通量增强的20-30％），其中最重要的是气温/土壤湿度和气温/辐照度。析因实验的结果表明，包含二阶相互作用的模型可以适当地解释通量对研究因素变化的响应。基于阶乘实验结果，并使用动态通量室（DFC）在不同温度，土壤湿度，太阳辐射暴露和土壤汞含量下测量的十二种土壤材料的通量数据，估算出土壤中汞通量的两个经验模型被开发。未使用模型开发的环境通量数据进行的模型验证表明，该模型能够以较高的可预测性估算干燥土壤中的汞通量（r〜0.9）。

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  • 来源
    《Environmental Science & Technology》 |2010年第22期|p.8522-8528|共7页
  • 作者

    CHE-IEN LIN; MAE S. GUSTIN; PATTARAPORN SINGHASUK; CHRIS ECKLEY; MATTHIEU MILLER;

  • 作者单位

    Department of Civil Engineering, Lamar University,Beaumont, Texas 77710, United States;

    Department of Natural Resources & Environmental Science, University of Nevada, Reno, Nevada 89557, United States;

    Department of Industrial Engineering, Lamar University,Beaumont, Texas 77710, United States;

    Department of Natural Resources & Environmental Science, University of Nevada, Reno, Nevada 89557, United States,Environment Canada, Vancouver, BC V6C 3S5, Canada;

    Department of Natural Resources & Environmental Science, University of Nevada, Reno, Nevada 89557, 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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