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Contemporary Mobilization of Legacy Pb Stores by DOM in a Boreal Peatland

机译：DOM在北方泥炭地中对传统Pb商店的当代动员

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摘要

We examined how different landscape areas in a catchment containing a northern ombrotrophic peatland and upland mineral soils responded to dramatic decreases in atmospheric deposition of lead (Pb). Pb concentrations in the outflow stream from the peatland measured from 2009–2015 indicated continued mobilization and export of Pb derived from historic inputs to the bog. In contrast, Pb concentrations in surface peat and runoff from upland mineral soils have declined in response to reductions in atmospheric deposition. Relative to the early 1980s, Pb concentrations in the streamflow decreased only ∼50%, while Pb in surface peat and upland subsurface runoff decreased by more than 90%. Water level fluctuations in the slow-accumulating peat have allowed dissolved organic matter (DOM) to continue mobilizing Pb deposited in the peatland decades earlier. Strong correlations between dissolved organic carbon (DOC) and Pb concentrations in outflow from the peatland and in bog porewaters demonstrate Pb mobility related to DOM production. Peat stores of Pb in 2016 were less than or equal to those reported in the early 1980s despite the dry mass inventory increasing by 60–80%. Much of the loss in Pb stored in peat can be accounted for by stream runoff from the peatland.
机译：我们研究了包含北部非营养性泥炭地和高地矿物土壤的流域中不同的景观区域如何响应大气中铅（Pb）沉积的急剧下降。从2009年至2015年测得的泥炭地流出流中的Pb浓度表明，从沼泽的历史投入中提取的Pb仍在继续动员和出口。相比之下，高地矿物土壤中表层泥炭和径流中的Pb浓度响应于大气沉积的减少而下降。相对于1980年代初，水流中的Pb浓度仅下降了约50％，而表层泥炭和山地地下径流中的Pb下降了90％以上。缓慢积累的泥炭中的水位波动使溶解的有机物（DOM）继续移动几十年前沉积在泥炭地中的Pb。从泥炭地和沼泽孔隙水中流出的溶解有机碳（DOC）与Pb浓度之间的强相关性表明Pb的迁移与DOM产生有关。尽管干物质库存增加了60-80％，但2016年铅的泥炭储量仍小于或等于1980年代初的储量。泥炭中的铅流失大部分可以通过泥炭地的径流来解释。

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  • 来源
    《Environmental Science & Technology》 |2018年第6期|3375-3383|共9页
  • 作者

    Jeff D. Jeremiason; Erin I. Baumann; Stephen D. Sebestyen; Alison M. Agather; Emily A. Seelen; Benjamin J. Carlson-Stehlin; Meghan M. Funke; James B. Cotner;

  • 作者单位

    Gustavus Adolphus College, St Peter, Minnesota 56082, United States;

    Gustavus Adolphus College, St Peter, Minnesota 56082, United States;

    Northern Research Station, Forest Service, U.S. Department of Agriculture (USDA), Grand Rapids, Minnesota 55744, United States;

    Gustavus Adolphus College, St Peter, Minnesota 56082, United States;

    Gustavus Adolphus College, St Peter, Minnesota 56082, United States;

    Gustavus Adolphus College, St Peter, Minnesota 56082, United States;

    Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota 55108, United States;

    Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota 55108, 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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