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Assessment of river ecosystem health in Tianjin City, China: index of ecological integrity and water comprehensive pollution approach

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Abstract

Evaluation of the river ecological environment can provide a basis for river management and ecological restoration. To conduct a comprehensive health assessment of the rivers in Tianjin, their biological, physical, and chemical indicators are investigated on the basis of 32 river monitoring sites from August to September 2018. The comprehensive pollution and ecological integrity indexes of the rivers are analyzed. Results of the two evaluations, compared to achieve the river ecological environment evaluation, are as follows. 1) Index of Ecological Integrity evaluation shows that among the sampling points, 18.8% are “healthy”, 28.1% are “sub-healthy”, 40.6% are “fair”, 6.3% are “poor”, and 6.3% are “very poor”. 2) The comprehensive evaluation of the chemical properties of the 32 river ecosystems in Tianjin shows severe overall river pollution and low standard water function area. Of the total sampling sites, 16 (50%) are heavily contaminated and 10 (31.3%) are moderately contaminated. Excessive chemical oxygen demand and ammonia nitrogen are the main causes of water pollution. 3) The Index of Ecological Integrity (IEI) has high correspondence with environmental factors. Pearson correlation analysis results show that the IEI index is significantly correlated with permanganate index (R = − 0.453; P = 0.023 < 0.05). Analysis results using BEST show that ammonia nitrogen is the best environmental parameter to explain the changes in IEI (Rho= 0.154; P = 0.02 < 0.05) and those using RELATE show significant correlation between the biotic index and the environmental parameter matrices (Rho= 0.154; P = 0.034 < 0.05).

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Acknowledgements

This study was financially supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China (No. 2018ZX07111002) and the Major Science and Technology Program for Water Pollution Control and Treatment of China (No. 2017ZX07107001). The authors express their sincere thanks for this support.

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Authors and Affiliations

  1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China

    Yan Wang, Mingdong Sun, Xubo Lv, Wenqian Cai, Xiangqin Xu & Kun Lei

  2. Beijing Jiaotong University, Beijing, 100044, China

    Shang Zhao

  3. Zhujiang College, South China Agricultural University, Guangzhou, 510642, China

    Hongxiang Ge

Authors
  1. Yan Wang
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  2. Shang Zhao
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  3. Mingdong Sun
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  4. Xubo Lv
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  5. Wenqian Cai
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  6. Xiangqin Xu
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  7. Hongxiang Ge
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  8. Kun Lei
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Correspondence to Xiangqin Xu or Hongxiang Ge.

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Wang, Y., Zhao, S., Sun, M. et al. Assessment of river ecosystem health in Tianjin City, China: index of ecological integrity and water comprehensive pollution approach. Front. Earth Sci. 15, 936–946 (2021). https://doi.org/10.1007/s11707-020-0857-6

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  • DOI: https://doi.org/10.1007/s11707-020-0857-6

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