State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, 210023, China.
State Key Laboratory of Hydrology and Water Resource and Hydraulic Engineering Science, Nanjing Hydraulic Research Institute, Jiangsu, 210029, China.
Bull Environ Contam Toxicol. 2020 Apr;104(4):538-544. doi: 10.1007/s00128-020-02791-3. Epub 2020 Mar 4.
The Three Gorges Dam (TGD) is the largest hydropower facility in the world, influencing the riverine hydrology and mass flux in the Yangtze River. Little is known about its impact on the riverine dissolved organic matter (DOM) quality. In this work, the water quality and DOM quality for water samples collected from the upstream and downstream sites of TGD were investigated. The presence of TGD significantly affects the quantity and quality of DOM but has no pronounced effect on nutrient concentrations. Upstream DOM had higher concentration but lower average molecular weight and aromaticity than the downstream DOM. The biological processes in the dam reservoir contribute significantly to upstream DOM. In the downstream sites, terrestrial DOM input raises the average molecular weight and aromaticity of the overall DOM pool. These results suggest that TGD will influence not only the mass flux of organic carbon but also its quality and lability, which has both environmental and ecological significance.
三峡大坝是世界上最大的水力发电设施，影响长江的河流水文和物质通量。然而，对于它对河流溶解有机物（DOM）质量的影响，人们知之甚少。在这项工作中，研究了取自三峡大坝上下游站点的水样的水质和 DOM 质量。三峡大坝的存在显著影响 DOM 的数量和质量，但对营养物浓度没有明显影响。上游 DOM 的浓度较高，但平均分子量和芳香度较低。大坝水库中的生物过程对上游 DOM 有重要贡献。在下游站点，陆地 DOM 的输入提高了整个 DOM 库的平均分子量和芳香度。这些结果表明，三峡大坝不仅会影响有机碳的物质通量，还会影响其质量和不稳定性，这具有环境和生态意义。
