Blackwell Bradley D, Driscoll Charles T
Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, USA.
Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, USA.
Environ Pollut. 2015 Jul;202:126-34. doi: 10.1016/j.envpol.2015.02.036. Epub 2015 Mar 26.
We evaluated spatial patterns of mercury (Hg) deposition through analysis of foliage and forest floor samples from 45 sites across Adirondack Park, NY. Species-specific differences in foliar Hg were evident with the lowest concentrations found in first-year conifer needles and highest concentrations found in black cherry (Prunus serotina). For foliage and forest floor samples, latitude and longitude were negatively correlated with Hg concentrations, likely because of proximity to emission sources, while elevation was positively correlated with Hg concentrations. Elemental analysis showed moderately strong, positive correlations between Hg and nitrogen concentrations. The spatial pattern of Hg deposition across the Adirondacks is similar to patterns of other contaminants that originate largely from combustion sources such as nitrogen and sulfur. The results of this study suggest foliage can be used to assess spatial patterns of Hg deposition in small regions or areas of varied topography where current Hg deposition models are too coarse to predict deposition accurately.
我们通过分析纽约阿迪朗达克公园45个地点的树叶和林地样本，评估了汞（Hg）沉积的空间模式。叶汞含量存在物种特异性差异，一年生针叶树针叶中的汞浓度最低，黑樱桃（Prunus serotina）中的汞浓度最高。对于树叶和林地样本，纬度和经度与汞浓度呈负相关，这可能是因为靠近排放源，而海拔与汞浓度呈正相关。元素分析表明汞与氮浓度之间存在中等强度的正相关。阿迪朗达克地区汞沉积的空间模式与其他主要源自燃烧源的污染物（如氮和硫）的模式相似。本研究结果表明，在当前汞沉积模型过于粗略而无法准确预测沉积的小区域或地形多样的地区，树叶可用于评估汞沉积的空间模式。
