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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Landscape controls on total and methyl Hg in the upper Hudson River basin, New York, USA
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Landscape controls on total and methyl Hg in the upper Hudson River basin, New York, USA

机译：美国纽约哈德逊河上游流域的总汞和甲基汞的景观控制

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摘要

Approaches are needed to better predict spatial variation in riverine Hg concentrations across heterogeneous landscapes that include mountains, wetlands, and open waters. We applied multivariate linear regression to determine the landscape factors and chemical variables that best account for the spatial variation of total Hg (THg) and methyl Hg (MeHg) concentrations in 27 sub-basins across the 493 km ~2 upper Hudson River basin in the Adirondack Mountains of New York. THg concentrations varied by sixfold, and those of MeHg by 40-fold in synoptic samples collected at low-to-moderate flow, during spring and summer of 2006 and 2008. Bivariate linear regression relations of THg and MeHg concentrations with either percent wetland area or DOC concentrations were significant but could account for only about 1/3 of the variation in these Hg forms in summer. In contrast, multivariate linear regression relations that included metrics of (1) hydrogeomorphology, (2) riparian/wetland area, and (3) open water, explained about 66% to >90% of spatial variation in each Hg form in spring and summer samples. These metrics reflect the influence of basin morphometry and riparian soils on Hg source and transport, and the role of open water as a Hg sink. Multivariate models based solely on these landscape metrics generally accounted for as much or more of the variation in Hg concentrations than models based on chemical and physical metrics, and show great promise for identifying waters with expected high Hg concentrations in the Adirondack region and similar glaciated riverine ecosystems.
机译：需要采取各种方法来更好地预测包括山区，湿地和开阔水域在内的异质景观中河流中汞浓度的空间变化。我们应用多元线性回归来确定景观因子和化学变量，这些变量和变量最能说明哈德逊河上游493 km〜2流域27个子流域中总Hg（THg）和甲基Hg（MeHg）浓度的空间变化。纽约阿迪朗达克山脉。 2006年春季和夏季以及2008年春季和夏季，在以中低流量采集的天气样品中，THg浓度变化了六倍，而MeHg浓度变化了40倍。THg和MeHg浓度与湿地面积百分比或DOC浓度很高，但夏季仅能解释这些汞形式的变化的约1/3。相反，多元线性回归关系包括（1）水文地貌学，（2）河岸/湿地面积和（3）开阔水域等指标，解释了春季和夏季每种汞形式的空间变化的约66％至> 90％样品。这些指标反映了盆地形态和河岸土壤对汞来源和迁移的影响，以及开放水作为汞汇的作用。与基于化学和物理指标的模型相比，仅基于这些景观指标的多元模型通常可解释更多或更多的汞浓度变化，并且对于识别阿迪朗达克地区和类似冰川河中的汞含量预计较高的水域具有广阔的前景。生态系统。

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