Inputs, storage, and transport of total and methyl mercury in two temperate forest wetlands
Inputs, storage, and transport of total and methyl mercury in two temperate forest wetlands
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DOI：
10.1029/2008jg000739
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发表时间：
2008-06
影响因子：
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通讯作者：
P. Selvendiran;C. Driscoll;M. Montesdeoca;J. Bushey
中科院分区：
文献类型：
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作者：
P. Selvendiran;C. Driscoll;M. Montesdeoca;J. Bushey
与溪流连通。元素汞（Hg O）在海狸草甸湿地的挥发率与大气汞沉积总量相似，是全年汞收支的重要组成部分。与此相反，每年的HgO通量表现出净转移从大气到土壤中的河岸湿地可能是因为挥发速率减缓了HgO通过土壤的扩散到空气-水界面在水饱和的土壤。湿地土壤中总汞和甲基汞的储存是一个与碳、硫积累耦合的大库。在目前汞排放和大气沉降不断减少的情况下，湿地中的大型“活性"土壤库是汞和甲基汞向下游水生生态系统的潜在短期和长期来源。
connectivity to stream water. The volatilization rate of elemental mercury (Hg o )i n the beaver meadow wetland is of similar magnitude compared to total atmospheric Hg deposition and constitutes an important component of the overall annual Hg budget. In contrast, annual Hg o fluxes exhibited net transfer from the atmosphere to soil at the riparian wetland possibly because volatilization rates were retarded by slower diffusion of Hg o through soil to the air-water interface in water-saturated soil. The storage of THg and MeHg in wetland soil is a large pool which appears coupled with carbon and sulfur accumulation. In the current scenario of decreasing Hg emissions and atmospheric deposition, the large ‘‘active’’ soil pool in wetlands is a potential short-term and long-term source of Hg and MeHg to downstream aquatic ecosystems.