| 项目编号: | 1353850
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| 项目名称: | Collaborative Proposal: "SG" Identifying Sources and Degradation Mechanisms of Methylmercury in Temperate Forest Ecosystems |
| 作者: | Joel Blum
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| 承担单位: | University of Michigan Ann Arbor
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| 批准年: | 2013
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| 开始日期: | 2014-04-01
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| 结束日期: | 2018-03-31
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| 资助金额: | USD59782
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | methylmercury
; source
; forest food web
; human source
; methylmercury bio-accumulate
; forest organism
; soil
; methylmercury accumulation
; different temperate forest
; forest soil
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| 英文摘要: | This project is aimed at understanding the cycling of mercury, including the mechanisms of its transformation into the highly-toxic form, methylmercury, in terrestrial systems. Mercury is naturally present in ecosystems, but also comes from human sources. Methylmercury bio-accumulates in food webs and can threaten forest organisms such as songbirds. This research will examine mercury cycling in four different temperate forests across the United States using mercury stable isotope analysis of forest food webs. This technique can fingerprint the methylmercury in forest organisms and help determine the pathways and sources including rain, soil and tree leaves. After obtaining the isotope fingerprint of all samples, statistical models will be used to estimate the relative contribution of each source (precipitation, soil and tree leaves) to methylmercury accumulation in forest food webs. The investigators are basing this research on two surprising findings: 1) that methylmercury is high in soils (surprising because forest soils are not anoxic); and 2) that methylmercury is being degraded in soils, and thus the mercury loading is much higher than previously predicted.
The proposed work will provide unique training opportunities for undergraduate and graduate students of different academic backgrounds from both the University of North Carolina at Greensboro and the University of Michigan. The principal investigators will integrate this research into classes at both institutions, including field visits and case studies. The principal investigators will also carry out public outreach in the form of a website intended to highlight the findings and impacts of mercury on wildlife to non-scientific audiences. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/97131
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Joel Blum. Collaborative Proposal: "SG" Identifying Sources and Degradation Mechanisms of Methylmercury in Temperate Forest Ecosystems. 2013-01-01.
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