Arid
DOI10.1016/j.scitotenv.2005.11.025
Mercury distribution in two Sierran forest and one desert sagebrush steppe ecosystems and the effects of fire
Engle, Mark A.; Gustin, Mae Sexauer; Johnson, Dale W.; Murphy, James F.; Miller, Wally W.; Walker, Roger F.; Wright, Joan; Markee, Melissa
通讯作者Gustin, Mae Sexauer
来源期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
EISSN1879-1026
出版年2006
卷号367期号:1页码:222-233
英文摘要

Mercury (Hg) concentration, reservoir mass, and Hg reservoir size were determined for vegetation components, litter, and mineral soil for two Sierran forest sites and one desert sagebrush steppe site. Mercury was found to be held primarily in the mineral soil (maximum depth of 60 to 100 cm), which contained more than 90% of the total ecosystem reservoir. However, Hg in foliage, bark, and litter plays a more dominant role in Hg cycling than the mineral soil. Mercury partitioning into ecosystem components at the Sierran forest sites was similar to that observed for other US forest sites. Vegetation and litter Hg reservoirs were significantly smaller in the sagebrush steppe system because of lower biomass. Data collected from these ecosystems after wildfire and prescribed burns showed a significant decrease in the Hg pool from certain reservoirs. No loss from mineral soil was observed for the study areas but data from fire severity points suggested that Hg in the upper few millimeters of surface soil may be volatilized due to exposure to elevated temperatures. Comparison of data from burned and unburned plots suggested that the only significant source of atmospheric Hg from the prescribed burn was combustion of litter. Differences in unburned versus burned Hg reservoirs at the forest wildfire site demonstrated that drastic reduction in the litter and above ground live biomass Hg reservoirs after burning had occurred. Sagebrush and litter were absent in the burned plots after a wildfire suggesting that both reservoirs were released during the fire. Mercury emissions due to fire from the forest prescribed burn, forest wildfire, and sagebrush steppe wildfire sites were roughly estimated at 2.0 to 5.1, 2.2 to 4.9, and 0.36 +/- 0.13 g ha(-1), respectively, with litter and vegetation being the most important sources. (c) 2005 Elsevier B.V All rights reserved.


英文关键词fire mercury emission ecosystem forest desert
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000240179700021
WOS关键词ATMOSPHERIC MERCURY ; FOLIAR EXCHANGE ; GASEOUS MERCURY ; SOIL ; VEGETATION ; EMISSIONS ; BIOMASS ; CARBON ; METHYLMERCURY ; ACCUMULATION
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/153016
作者单位(1)Univ Nevada, Dept Nat Resources & Environm Sci, Mail Stop 370, Reno, NV 89557 USA
推荐引用方式
GB/T 7714
Engle, Mark A.,Gustin, Mae Sexauer,Johnson, Dale W.,et al. Mercury distribution in two Sierran forest and one desert sagebrush steppe ecosystems and the effects of fire[J],2006,367(1):222-233.
APA Engle, Mark A..,Gustin, Mae Sexauer.,Johnson, Dale W..,Murphy, James F..,Miller, Wally W..,...&Markee, Melissa.(2006).Mercury distribution in two Sierran forest and one desert sagebrush steppe ecosystems and the effects of fire.SCIENCE OF THE TOTAL ENVIRONMENT,367(1),222-233.
MLA Engle, Mark A.,et al."Mercury distribution in two Sierran forest and one desert sagebrush steppe ecosystems and the effects of fire".SCIENCE OF THE TOTAL ENVIRONMENT 367.1(2006):222-233.
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