Release of mercury from Rocky Mountain forest fires
Release of mercury from Rocky Mountain forest fires
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DOI：
10.1029/2006gb002696
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发表时间：
2007-01-09
影响因子：
5.2
通讯作者：
Keeler, Gerald J.
中科院分区：
文献类型：
--
作者：
Biswas, Abir;Blum, Joel D.;Keeler, Gerald J.
汞（Hg）在土壤剖面和植被中的浓度进行了检查，在未燃烧的地区，并在最近烧毁的地区，在西部怀俄明州的低，中，高火灾的严重性野火。研究了具有相似树种组成、林分年龄、气候和地质基质的成对未燃烧和燃烧取样点。结果表明，汞释放的森林火灾是依赖于树种组成的森林，影响火灾前汞积累，以及森林火灾的严重程度。根据美国每年平均烧毁2.7x10（6）公顷森林和灌木林的数据，我们估计美国的野火和规定的焚烧每年释放19x10（6）克至64x10（6）克汞。这相当于美国人为汞通量（150x10（6）g）的13%至42%。
Concentrations of mercury (Hg) in soil profiles and vegetation were examined in unburned areas and in areas recently burned by wildfires of low, medium, and high fire severities in western Wyoming. Paired unburned and burned sampling sites with similar tree species composition, forest stand age, climate, and geological substrate were studied. Results indicate that Hg release from forest fires is dependent on the tree species composition of the forest, which affects prefire Hg accumulation, as well as the forest fire severity. On the basis of an average of 2.7x10(6) ha of forest and shrubland burned annually in the United States we estimate that wildfires and prescribed burns in the United States release 19 to 64x10(6) g of Hg annually. This represents between 13 and 42% of the estimated United States anthropogenic Hg flux of 150x10(6) g.