丰水期乌江上游干流水库—河流体系硫同位素组成  

SULFUR ISOTOPE COMPOSITION OF RIVER CHANNEL AND RESERVOIR WATER IN UPPER REACHES OF WUJIANG RIVER IN HIGH FLOW SEASON

作　　者：李干蓉[1] 刘丛强[2] 陈椽[1] 汪福顺[3] 王宝利[2] 李军 灌瑾[2] 

机构地区：[1]贵州师范大学生命科学学院,贵州贵阳550001 [2]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,贵州贵阳550002 [3]上海大学环境与化工学院,上海201800

出　　处：《长江流域资源与环境》2009年第4期350-355,共6页Resources and Environment in the Yangtze Basin

基　　金：中国科学院海外合作伙伴计划项目;国家自然科学基金项目(90610037,40603004,40721002);国家重点基础发展研究计划(2006CB403205)

摘　　要：2007年7月对乌江上游河流、乌江干流上的3座不同库龄的梯级水库(洪家渡水库、东风水库、乌江渡水库)表层及垂直剖面水体的可溶性硫酸盐的硫同位素组成进行了研究。在垂直剖面上,洪家渡水库硫同位素值(δ34S)介于+0.3‰^+3.1‰,下泄水为-0.7‰;东风水库δ34S值介于-7.5‰^-5.5‰,下泄水为-6.8‰;乌江渡水库δ34S值介于-4.3‰^-0.6‰,下泄水为-2.9‰。上述结论表明,硫同位素组成变化反映了水库硫的不同来源及生物地球化学过程。不同水库表层和垂直剖面水体的硫同位素平均值有差别,水库表层的硫同位素比值主要受输入水体的控制,垂直剖面由表层向下硫同位素比值偏负,主要是由于生物作用以及有机硫的氧化造成的。The compositions of sulfur isotopes were investigated in cascade reservoirs with different running ages （Hongjiadu Reservoir, Dongfeng Reservoir and Wujiangdu Reservoir） along Wujiang River. Water samples in the front of dams were collected along water column, and other river water samples were collected at 0.5m below water surface in July, 2007. The sulfur isotopic compositions （334S） along water column varied from ＋0.3‰ to ＋3.1‰ in Hongjiadu Reservoir, --7.5‰ to --5.5‰ in Dongfeng Reservoir, and --4.3‰ to --0.6‰ in Wujiangdu Reservoir, respectively. The 334S in the release water of these three reservoirs were --0.7 ‰, --6.8‰, and --2.9‰ respectively. The results indicate that the changes in sulfur isotopic compositions mainly reflect the biogeochemical processes and the different sources of sulfur entering into reservoirs. Sulfur isotopic compositions in surface water and along water column showed a variation in different reservoirs. The δ^34 S in surface layer was controlled by the sulfur isotopic compositions of the input water, while the δ^34 S along water column decreased with the increase in depth, reflecting an influence of biological function and organic sulfur oxidation.

关 键 词：硫同位素 乌江流域 丰水期 梯级水库 

分 类 号：X513[环境科学与工程—环境工程] TV697.11[水利工程—水利水电工程]