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首页> 外文期刊>Environmental Science & Technology >Net Degradation of Methyl Mercury in Alder Swamps
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Net Degradation of Methyl Mercury in Alder Swamps

机译：Al木沼泽中甲基汞的净降解

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摘要

Wetlands are generally considered to be sources of methyl mercury (MeHg) in northern temperate landscapes. However, a recent input-output mass balance study during 2007-2010 revealed a black alder (Alnus glutinosa) swamp in southern Sweden to be a consistent and significant MeHg sink, with a 30-60% loss of MeHg. The soil pool of MeHg varied substantially between years, but it always decreased with distance from the stream inlet to the swamp. The soil MeHg pool was significantly lower in the downstream as compared to the upstream half of the swamp (0.66 and 1.34 ng MeHg g~(-1) SOC~(-1) annual average~(-1), respectively, one-way ANOVA, p = 0.0006). In 2008 a significant decrease of %MeHg in soil was paralleled by a significant increase in potential demethylation rate constant (k_d, p < 0.02 and p < 0.004, respectively). In contrast, the potential mefhylation rate constant (k_m) was unrelated to distance (p = 0.3). Our results suggest that MeHg was net degraded in the Alnus swamp, and that it had a rapid and dynamic internal turnover of MeHg. Snapshot stream input-output measurements at eight additional Alnus glutinosa swamps in southern Sweden indicate that Alnus swamps in general are sinks for MeHg. Our findings have implications for forestry practices and landscape planning, and suggest that restored or preserved Alnus swamps may be used to mitigate MeHg produced in northern temperate landscapes.
机译：在北部温带地区，湿地通常被认为是甲基汞（MeHg）的来源。但是，最近的一项2007-2010年投入-产出质量平衡研究显示，瑞典南部的一个黑der（沼泽Al）沼泽是一个持续且重要的MeHg汇，其MeHg损失了30-60％。 MeHg的土壤池在数年之间变化很大，但是随着从溪流入口到沼泽的距离，土壤池总是减少。与沼泽的上游一半相比，下游的土壤MeHg池显着降低（单向分别为0.66和1.34 ng MeHg g〜（-1）SOC〜（-1）年平均〜（-1））。方差分析，p = 0.0006）。在2008年，土壤中％MeHg的显着下降与潜在的脱甲基速率常数的显着增加同时出现（分别为k_d，p <0.02和p <0.004）。相反，潜在的甲酰化速率常数（k_m）与距离无关（p = 0.3）。我们的结果表明，MeHg在Alnus沼泽中净降解，并且MeHg的内部动态快速变化。在瑞典南部另外八个八角nu沼泽地的快照流输入-输出测量结果表明，八角sw沼泽通常是MeHg的汇。我们的发现对林业实践和景观规划具有影响，并表明恢复或保存的Al木沼泽可用于减轻北部温带景观中产生的甲基汞。

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  • 来源
    《Environmental Science & Technology》 |2012年第24期|13144-13151|共8页
  • 作者

    Rose-Marie Kronberg; Ida Tjerngren; Andreas Drott; Erik Bjoern; Ulf Skyllberg;

  • 作者单位

    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden,These authors contributed equally to this work;

    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden,These authors contributed equally to this work;

    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden;

    Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden;

    Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden;

  • 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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