Journal of Atmospheric and Environmental Optics, Volume. 20, Issue 4, 520(2025)

Ecological security evaluation of Qilihai Wetland based on multi-temporal images

WEI Jingyi and GAO Wei
Author Affiliations
  • School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China
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    Figures & Tables(12)
    Map of Tianjin Municipality (a) and location map of Qilihai Wetland Nature Reserve (b)
    Land use classification map of Qilihai Wetland in 2016 (a), 2019 (b), 2022 (c)
    Land use type conversion from 2016 to 2019 (a), and from 2019 to 2022 (b)
    Habitat quality grading map for 2016 (a), 2019 (b), 2022 (c)
    • Table 1. Habitat threat factors

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      Table 1. Habitat threat factors

      Threat factorsMaximum impact distanceWeightRecession type
      Cultivated land0.500.80Exponential
      Construction land8.001.00Exponential
      Road2.000.60Linear
      Bare land3.000.50Exponential
    • Table 2. Sensitivity of each land-use type to habitat threat factors

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      Table 2. Sensitivity of each land-use type to habitat threat factors

      Land useHabitat suitabilityCultivated landConstruction landBare landRoad
      Water1.000.300.750.600.60
      Woodland0.800.500.300.800.70
      Swamp meadow1.000.500.900.400.70
      Cultivated land0.4000.900.500.50
      Construction land00000
      Bare land001.0000.10
    • Table 3. PSR evaluation index and weight value of ecological security of Qilihai Wetland

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      Table 3. PSR evaluation index and weight value of ecological security of Qilihai Wetland

      Guidelines layerMetrics layerWeight value
      PressurePopulation density0.061
      Urbanization index0.124
      StateSHDI0.065
      MPS0.170
      SHEI0.070
      Hydrological regulation0.044
      NDVI0.238
      ResponsePD0.029
      Habitat quality0.120
      Wildlife habitat index0.079
    • Table 4. Proportion and dynamics of land use types in Qilihai Wetland from 2016 to 2022

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      Table 4. Proportion and dynamics of land use types in Qilihai Wetland from 2016 to 2022

      Type of land useProportion/%Dynamics/%
      2016201920222016―20192019―20222016―2022
      Cultivated land60.7360.2358.33-0.50-1.90-2.40
      Construction land12.3312.4012.310.07-0.08-0.01
      Woodland0.110.130.280.020.150.17
      Bare land0.200.120.04-0.08-0.08-0.16
      Water17.7317.6616.45-0.07-1.22-1.28
      Swamp meadow8.909.4612.590.563.133.69
    • Table 5. Area transfer matrix of land use types in Qilihai Wetland from 2016 to 2022

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      Table 5. Area transfer matrix of land use types in Qilihai Wetland from 2016 to 2022

      TimeType of land useCultivated landConstruction landWoodlandBare landWaterSwamp meadowTotal
      2016―2019Cultivated land195.241.680.130.103.097.05207.30
      Construction Land2.3539.1700.110.520.5142.66
      Woodland0.1400.0500.020.230.45
      Bare land0.030.1300.080.080.080.40
      Water4.330.750.020.3354.331.0160.78
      Swamp meadow6.910.690.170.082.9721.7432.56
      Total209.0142.420.380.7061.0230.62344.15
      2019―2022Cultivated land190.441.910.010.013.045.34200.74
      Construction Land1.7439.5600.070.630.3742.37
      Woodland0.590.010.1500.080.130.97
      Bare land0.010.0200.020.020.050.13
      Water2.490.620.090.0651.691.6456.60
      Swamp meadow12.030.540.190.245.3225.0143.34
      Total207.3042.660.450.4060.7832.56344.15
    • Table 6. Landscape pattern index of Qilihai Wetland

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      Table 6. Landscape pattern index of Qilihai Wetland

      Calculate metricsLandscape pattern index
      201620192022
      NP199216651704
      PD5.8894.9404.951
      MPS17.27620.66920.196
      LPI33.99226.70026.292
      CONTAGI66.14766.01566.852
      SHDI1.1021.1101.149
      SHEI0.6150.6190.641
    • Table 7. Proportion and dynamics of habitat quality area at different levels of Qilihai Wetland from 2016 to 2022

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      Table 7. Proportion and dynamics of habitat quality area at different levels of Qilihai Wetland from 2016 to 2022

      Habitat qualityProportion/%Dynamics/%
      2016201920222016―20192019―20222016―2022
      Poor13.2612.9812.71-0.28-0.26-0.54
      Average66.2966.1665.64-0.13-0.52-0.65
      Medium5.876.375.020.50-1.35-0.85
      Good5.394.465.91-0.931.450.52
      Excellent9.2010.0410.720.840.681.53
    • Table 8. Ecological security status and safety level of Qilihai Wetland

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      Table 8. Ecological security status and safety level of Qilihai Wetland

      TimeEcological safety evaluation indexSecurity level
      20160.532Low warning
      20190.553Low warning
      20220.595Low warning
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    Jingyi WEI, Wei GAO. Ecological security evaluation of Qilihai Wetland based on multi-temporal images[J]. Journal of Atmospheric and Environmental Optics, 2025, 20(4): 520

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    Paper Information

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    Received: May. 24, 2023

    Accepted: --

    Published Online: Sep. 30, 2025

    The Author Email:

    DOI:10.3969/j.issn.1673-6141.2025.04.009

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