【摘 要】
：
In order to explore the contributions of wet deposition and surface runoff formed by rainfall events to the water body mercury burden in Three Gorges Reserv
【机 构】
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College of Resources and Environment,Southwest University,Chongqing,400715,China
【出 处】
：
The 17th International Conference on Heavy Metals in the Env
论文部分内容阅读
In order to explore the contributions of wet deposition and surface runoff formed by rainfall events to the water body mercury burden in Three Gorges Reservoir,we conducted a one-year successive study on the deposition fluxes and runoff output characteristics of total mercury(THg)and methylmercury(TMeHg)in a typical small agricultural watershed in Three Gorges Reservoir area.The results showed that the annual average values and annual deposition fluxes of THg and TMeHg in rainfall were 34.35±27.31 ng?L-1 and 0.347±0.218 ng?L-1,12.43 ?g m-2 yr-1 and 174.00 ng m-2 yr-1,respectively.Moreover,both THg and TMeHg were dominated by the particulate phase.The annual average concentrations and output fluxes of THg and TMeHg in surface runoff were 10.40±6.48 ng?L-1 and 0.154±0.146 ng?L-1,1.17±0.73 ?g m-2 yr-1 and 17.26±16.36 ng m-2 yr-1,respectively.Combining with deposition fluxes,the retention rates of THg and TMeHg in study area were 90.59%and 90.08%,respectively.However,the two sub-catchments exhibited different retention effects,and retention rate was affected by human activities,climate,topography and geomorphology,land use,and other factors.
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