MERCURY CYCLING IN THE ALLEQUASH CREEK WATERSHED, NORTHERN WISCONSIN
MERCURY CYCLING IN THE ALLEQUASH CREEK WATERSHED, NORTHERN WISCONSIN
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DOI：
10.1007/bf01189692
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发表时间：
1995-02-01
影响因子：
2.9
通讯作者：
ANDREN, AW
中科院分区：
文献类型：
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作者：
KRABBENHOFT, DP;BENOIT, JM;ANDREN, AW
尽管最近我们对水环境中汞循环的理解有了重大进展，但很少有研究涉及流域尺度上的汞循环。特别是，对流域成分（高地土壤、地下水、湿地、溪流和湖泊）之间汞物种转移的关注一直缺乏。本研究描述了美国威斯康辛州北部Allequash Creek流域各组成部分中总汞和甲基汞的时空分布。总汞和甲基汞的大量增加被观察到，因为地下水通过泥炭排放，形成流入溪流的泉水，或流经湿地表面的小溪。这种增加伴随着DOC的增加。在秋季，当Allequash Creek湿地向溪流释放大量DOC时，沿整个溪流长度观察到总汞浓度增加了2-3倍。然而，甲基汞没有表现出类似的反应。总汞含量（0.9至6.3）和甲基汞含量(
Although there have been recent significant gains in our understanding of mercury (Hg) cycling in aquatic environments, few studies have addressed Hg cycling on a watershed scale. In particular, attention to Hg species transfer between watershed components (upland soils, groundwater, wetlands, streams, and lakes) has been lacking. This study describes spatial and temporal distributions of total Hg and MeHg among watershed components of the Allequash Creek watershed (northern Wisconsin, USA). Substantial increases in total Hg and MeHg were observed as groundwater discharged through peat to form springs that flow into the stream, or rivulets that drain across the surface of the wetland. This increase was concomitant with increases in DOC. During fall, when the Allequash Creek wetland released a substantial amount of DOC to the stream, a 2-3 fold increase in total Hg concentrations was observed along the entire length of the stream. Methylmercury, however, did not show a similar response. Substantial variability was observed in total Hg (0.9 to 6.3) and MeHg (