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生态学杂志 ›› 2011, Vol. 30 ›› Issue (05): 969-975.

• 汞的生物地球化学专辑 • 上一篇    下一篇

夜郎湖水库水体不同形态汞的时空分布

张军方1,2**,冯新斌3,闫海鱼3,郭艳娜3,孟博3,姚珩3   

  1. 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
  • 出版日期:2011-05-08 发布日期:2011-05-08

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

ZHANG Jun-fang1,2**, FENG Xin-bin3, YAN Hai-yu3, GUO Yan-na3, MENG Bo3, YAO Heng3   

  1. 1Guizhou Provincial Key Laboratory of Water Pollution Control &|Resource Reuse, Guiyang 550081, China|2Guizhou Institute of Environmental Science and Designing, Guiyang 550081, China|3State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
  • Online:2011-05-08 Published:2011-05-08

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(NO-3)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。

关键词: 植物乙醇提取物, 蚜虫, 蚜茧蜂, 忌避率, 干扰作用控制指数(IIPC)

Abstract: 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 (P<0.001) 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.

Key words: Plant alcohol extracts, Aphids, Parasitoids, Interferential index of population control(IIPC)