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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Inputs, storage, and transport of total and methyl mercury in two temperate forest wetlands
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Inputs, storage, and transport of total and methyl mercury in two temperate forest wetlands

机译：在两个温带森林湿地中的总汞和甲基汞的投入，储存和运输

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摘要

The fluxes and pools of total mercury (THg) and methyl mercury (MeHg) were evaluated for two northern temperate forest wetlands: an abandoned beaver meadow and a riparian wetland. Mass balance calculations reveal that the wetlands are net sources of THg and MeHg, although, the magnitude of the source is a function of wetland connectivity to stream water. The volatilization rate of elemental mercury (Hgo) in 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 Hgo fluxes exhibited net transfer from the atmosphere to soil at the riparian wetland possibly because volatilization rates were retarded by slower diffusion of Hgo 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.
机译：对北部的两个温带森林湿地：废弃的海狸草地和河岸湿地，评估了总汞（THg）和甲基汞（MeHg）的通量和库。质量平衡计算表明，湿地是THg和MeHg的净源，尽管该源的大小是湿地与河流水连通性的函数。海狸草甸湿地中元素汞的挥发速率与大气中汞的总沉积量相近，是每年汞总预算的重要组成部分。相反，在河岸湿地，每年的Hgo通量表现出从大气到土壤的净转移，这可能是由于Hgo通过土壤扩散到水饱和土壤中的空气-水界面较慢而阻碍了挥发速率。湿地土壤中THg和MeHg的存储量很大，似乎与碳和硫的积累有关。在当前减少汞排放和大气沉积的情况下，湿地中大量的“活跃”土壤库是下游水生生态系统潜在的短期和长期汞和甲基汞来源。

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