Release of mercury from Rocky Mountain forest fires

被引：86

作者：

Biswas, Abir

Blum, Joel D.

Klaue, Bjoern

Keeler, Gerald J.

机构：

[1] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Air Qual Lab, Ann Arbor, MI 48109 USA

来源：

GLOBAL BIOGEOCHEMICAL CYCLES | 2007年 / 21卷 / 01期

关键词：

D O I：

10.1029/2006GB002696

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

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页数：13

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