Journal of East China Normal University(Natural Science) ›› 2022, Vol. 2022 ›› Issue (3): 61-70.doi: 10.3969/j.issn.1000-5641.2022.03.007

• Ecological and Environmental Sciences • Previous Articles     Next Articles

Study on ecological environmental effects of sediment dredging: A case study on river regulation in Shandong Province

Chunyi YANG1(), Guangxiang MA2, Junjie GU2, Jiayan GU1, Guofu HE1,*(), Weixin KONG1, Gensen YANG1   

  1. 1. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China
    2. Shandong Academy of Environmental Sciences Co. Ltd., Ji’nan 250014, China
  • Received:2021-05-12 Online:2022-05-25 Published:2022-05-19
  • Contact: Guofu HE;


In this study, follow-up monitoring over the course of two and a half years was carried out to analyze the long-term impact of sediment dredging on water quality, new sediments, benthos, and microorganisms of a river reach in Shandong Province. The results showed that the contents of CODCr and TP could be effectively removed by dredging, but little effect was observed on the contents of TN and NH4+-N. The C/N ratio in the new sediments decreased gradually over the observation period, which was beneficial to the recovery of microbial and benthic communities. Dredging can reduce the average biomass and density of tremididae in surface sediments to a certain extent, while Chironomidae density is less affected by dredging. Dredging did not change the microbial community structure significantly, which may be related to the depth of dredging. Exogenous pollutants and man-made drainage can affect the water quality and sediment pollutant content of the dredged river section; this effect, however, may recover in a short time after completion of the microbial community construction. In conclusion, the overall engineering effects of dredging were observed during the study period (2–4 years after dredging); in this time, the water quality and sediment pollution improved, which was conducive to the restoration of benthos and microbial diversity. However, with the passage of time and human interference, the net effect on water quality maintenance weakened.

Key words: sediment dredging, water quality, sediment, benthos, microbial diversity

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