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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。
In July 2007, the sulfur isotopic composition of soluble sulfates in the surface and vertical sections of three upstream cascade reservoirs (Hongjiadu, Dongfeng and Wujiangdu reservoirs) on the upper Wujiang River and the Wujiang River was studied . In the vertical section, the sulfur isotope value (δ34S) of Hongjiadu Reservoir ranges from + 0.3 ‰ to + 3.1 ‰, and the discharge water is -0.7 ‰. The δ34S value of Dongfeng Reservoir ranges from -7.5 ‰ to -5.5 ‰, 6.8 ‰. The δ34S value of Wujiangdu Reservoir ranged from -4.3 ‰ to -0.6 ‰, and the discharge water was -2.9 ‰. The above conclusion shows that the variation of sulfur isotope composition reflects different sources and biogeochemical processes of reservoir sulfur. The average sulfur isotope values of water bodies in different reservoir surface and vertical section are different. The sulfur isotope ratio of reservoir surface is mainly controlled by the input water body, while the vertical section is negative from the subsurface sulfur isotope ratio, which is mainly due to the biological effect and the oxidation of organic sulfur Caused.