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[Ecological engineering for eutrophication control in lake].

G Sun1, L Sheng

  • 1National Laboratory of Grassland Ecological Engineering, Northeast Normal University, Changchun 130024. sungang@mail.nenu.edu.cn

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|January 5, 2002
PubMed
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Ecological engineering effectively controlled eutrophication in Nanhu Lake by removing phosphorus through harvesting aquatic plants and fish. This resulted in improved water quality, reduced total phosphorus, and a healthier phytoplankton community.

Area of Science:

  • Environmental Science
  • Ecological Engineering
  • Limnology

Context:

  • Eutrophication poses a significant threat to urban lake ecosystems, impacting water quality and biodiversity.
  • Nanhu Lake in Changchun faced severe eutrophication challenges prior to the intervention.
  • Understanding nutrient cycling and removal mechanisms is crucial for effective lake management.

Purpose:

  • To assess the efficacy of ecological engineering for eutrophication control in Nanhu Lake.
  • To quantify phosphorus removal through harvesting aquatic macrophytes and fishes.
  • To evaluate the impact of the intervention on water quality parameters and phytoplankton communities.

Summary:

  • Ecological engineering interventions in Nanhu Lake involved harvesting aquatic macrophytes (149.6 kg P) and fishes (189.9 kg P), alongside phosphorus fixation in molluscs (153.4 kg P).

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  • The total phosphorus removed (492.9 kg) approximated the lake's annual phosphorus input, demonstrating significant nutrient export.
  • Post-intervention, a decrease in total phosphorus concentration, reduced phytoplankton density, and an increase in phytoplankton species diversity were observed.

    • Impact:

    • The study highlights ecological engineering as a viable and effective strategy for mitigating eutrophication in urban lakes.
    • Improved water quality and ecosystem health were achieved, enhancing the ecological function of Nanhu Lake.
    • Further research into the roles of molluscs and fish in nutrient cycling is recommended for optimizing lake restoration efforts.