夜郎湖水库水体不同形态汞的时空分布  

Spatial and temporal distribution of mercury species in water in Yelanghu Reservoir

作　　者：张军方 冯新斌[3] 闫海鱼[3] 郭艳娜[3] 孟博[3] 姚珩[3] 

机构地区：[1]贵州省水污染控制与资源化技术研究重点实验室,贵阳550081 [2]贵州省环境科学研究设计院,贵阳550081 [3]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《生态学杂志》2011年第5期969-975,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金重点项目(40532014);贵州省2008年度科学技术基金项目(黔科合J字[2008]2032号)资助

摘　　要：于2006年7月(夏季)、2007年1月(冬季)和3月(春季)采集了贵州省夜郞湖水库水样,研究了不同形态汞(总汞、溶解态汞、颗粒态汞)的时空分布特征及其影响因素。结果表明,夏季水体总汞、溶解态汞、颗粒态汞平均含量分别为4.48±2.59、2.37±1.40、2.11±1.86 ng.L-1,均显著高于冬季和春季(P<0.001),而冬春2季不同形态汞含量无明显差异。水质参数悬浮颗粒物(SPM)和硝酸盐(NO3-)与不同形态汞之间均存在显著的正相关关系,表明这些参数对于不同形态汞的季节分布起着重要作用。夏季农业耕作活动相对活跃,表层土壤的扰动增加,雨水冲刷农田土壤,带进大量的外源颗粒物,致使夜郞湖水体夏季总汞水平较高。空间分布表明,夜郞湖水库夏季总汞平均浓度从水库入库河流至大坝方向、出库河流呈现总体下降的分布趋势,但水体各采样剖面没有明显的分布规律。A study was conducted during July 2006,January 2007 and March 2007 to determine the distribution of mercury species（total Hg（THg）,dissolved Hg（DHg）,particulate Hg（PHg）） and the impacts of some major controlling factors in the Yelanghu Reservoir,Guizhou,China.By comparison,the average concentrations of THg（4.48±2.59 ng·L-1）,DHg（2.37±1.40 ng·L-1）,PHg（2.11±1.86 ng·L-1） in the summer campaign are significantly higher（P0.001） than those in the winter and spring campaigns,while no significant differences of concentrations of different mercury species are found between the latter two campaigns.Our investigation revealed that SPM and NO-3 may play an important role in controlling the seasonal distribution of mercury species in the reservoir.It is assumed that higher concentrations of mercury species in the summer could be a result of runoff impact.High runoff volume due to abundant precipitation in the summer carried Hg-containing particulates eroded from the agriculture-dominated watershed into the reservoir.Spatial distribution reveals that mercury concentrations generally decreased from the reservoir inlet to the outlet,while no notable vertical trends were found at each sampling site.

关 键 词：夜郞湖水库 总汞 时空分布 控制因素 

分 类 号：X131.2[环境科学与工程—环境科学]