Environmental Science and Pollution Research

, Volume 26, Issue 5, pp 4645–4653 | Cite as

Effects of the Three Gorges Dam on spatiotemporal distribution of silicon in the tributary: evidence from the Xiangxi River

  • Yubo Huang
  • Wujuan Mi
  • Zhengyu Hu
  • Yonghong BiEmail author
Research Article


In order to get insight into the impact of Three Gorges Dam construction on silicon distribution pattern due to the altered hydraulic and environmental conditions, the Xiangxi River was chosen as the delegate of the tributaries in the Three Gorges Reservoir; dissolved silica (DSi), biogenic silica (BSi), and lithogenic silica (LSi) were investigated monthly from November 2015 to October 2016 and the hydrodynamic conditions and environmental parameters were addressed synchronously. DSi, BSi, and LSi ranged from 56.07 to 106.07 μmol/L, 0 to 5.64 μmol/L, and 0.49 to 11.47 μmol/L, with the average concentration of 81.84 ± 14.65 μmol/L, 1.11 ± 0.69 μmol/L, and 2.68 ± 1.97 μmol/L, respectively. DSi was significantly lower in the wet season than the dry season (P < 0.05), but BSi and LSi showed a converse trend. DSi was the dominant component in the total silicon (> 90%) and it has a higher concentration in the midstream than other sites. While BSi and LSi exhibited a decrease trend from the upstream to the downstream. Statistical analysis showed that DSi and LSi was primarily controlled by discharge. BSi concentration was affected by algal growth since it was positively correlated with Chla. The backwater area retained 3.67% total silicon. It was concluded that the spatiotemporal heterogeneity of silicon distribution related to hydrodynamics was determined by the regulation of dam; permanent backwater area was the main deposition area for silicon.


Silicon Spatiotemporal distribution Tributary Three Gorges Dam 


Funding information

This study has been jointly supported by the National Natural Science Foundation of China (No. 31123001) and the Science and Technology Research Project of China Three Gorges Corporation (No. 0704098).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yubo Huang
    • 1
    • 2
  • Wujuan Mi
    • 1
  • Zhengyu Hu
    • 1
  • Yonghong Bi
    • 1
    Email author
  1. 1.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of HydrobiologyChinese Academy of SciencesWuhanChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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