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<p>Urban lakes are vital components of the modern urban water system and landscape design. They play an important role in the construction of urban ecological civilization. However, in recent years, the urban lake ecosystem has been increasingly degraded, especially with the frequent cyanobacteria blooms, which directly threatens the maintenance of ecosystem service function and sustainable urban development. In this study, several sedimentary cores were collected from Hudie Lake located in the Yangtze River Delta in China that had not been dredged for centuries. Using one of the sediment cores that spans the past 200 years, we reconstructed the long-term environmental changes and examined the driving mechanisms of both human activities and natural factors affecting the lake’s dynamics. Our results indicated that, with the growth of the city, organic matter and nutrients in the lake had gradually increased. Notably, the significant increase in phosphorus had been a key factor driving cyanobacteria blooms in Hudie Lake. Since the 1960s, urban development and changes in land use around the lake had severely disturbed its natural habitats, leading to peak nutrient levels during the period from 2000 to 2010.</p>

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The long-term environmental evolution of an urban lake in the highly developed Yangtze River Delta

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Zhenglan Fu,
  • Longjuan Cheng,
  • Qingfeng Jiang,
  • Jiali Zhang,
  • Xinyue Chen,
  • Shuyi Yang,
  • Xinyuan Gao,
  • Xiang Kuai,
  • Dejun Wan,
  • Dongliang Ning,
  • Bin Xue

摘要

Urban lakes are vital components of the modern urban water system and landscape design. They play an important role in the construction of urban ecological civilization. However, in recent years, the urban lake ecosystem has been increasingly degraded, especially with the frequent cyanobacteria blooms, which directly threatens the maintenance of ecosystem service function and sustainable urban development. In this study, several sedimentary cores were collected from Hudie Lake located in the Yangtze River Delta in China that had not been dredged for centuries. Using one of the sediment cores that spans the past 200 years, we reconstructed the long-term environmental changes and examined the driving mechanisms of both human activities and natural factors affecting the lake’s dynamics. Our results indicated that, with the growth of the city, organic matter and nutrients in the lake had gradually increased. Notably, the significant increase in phosphorus had been a key factor driving cyanobacteria blooms in Hudie Lake. Since the 1960s, urban development and changes in land use around the lake had severely disturbed its natural habitats, leading to peak nutrient levels during the period from 2000 to 2010.