Tianjin Coastal Restoration Model Maps Priority Areas for Habitat, Carbon Storage, and Water Management

A new spatial analysis of Tianjin, China identifies where coastal ecosystem restoration should happen first. Researchers used the InVEST model to map four ecosystem services across the city's 11,917 square kilometers from 2000 to 2020: habitat quality, carbon storage, water yield, and soil conservation. They then simulated 2030 land use under three climate and development scenarios and combined the results into an Ecological Restoration Priority Index. The highest priority clusters, 1,919 of them, sit in the central and southern urban districts where development pressure is strongest. Key findings include a 12.34% drop in habitat quality over 20 years, a small net decline in carbon storage, and a 206% rise in modeled water yield that the authors attribute largely to impervious surfaces and runoff, not a healthy water supply. The study also flags persistent trade-offs between water yield and habitat quality, especially around Binhai New Area. For planners, the value is in the zoning framework: core protection zones covering 1,597 square kilometers, synergistic optimization zones, and lower urgency areas. The authors argue restoration should focus on the high conflict zones where habitat loss, carbon loss, and flood risk overlap. The model was calibrated with a Kappa coefficient of 0.835, and the authors tested both sustainable and fossil fuel dependent futures. Under SSP585, water yield spikes to 6 billion cubic meters, but the paper treats that as a runoff signal, not an ecological gain. That distinction matters for anyone using these maps for carbon or climate adaptation planning.