Abstract:
The wetland recoverability assessment could obtain the difficulty of wetland restoration, and provide important theoretical support for the site selection and implementation of wetland restoration. Based on the wetland types and ecological element data, the assessment method for the recoverability of damaged wetland was constructed by using wetland element damaged area and wetland type loss area, which could evaluate the recoverability of damaged wetland quantitatively. Based on the topographical conditions, urbanization effects and ecological importance indicators in the region, and using the source-sink theory and the minimum cumulative resistance model, a method to evaluate the regional recoverability of wetland was constructed, which were used to quantitatively evaluate the wetland natural recoverability at the regional scale. The evaluation methods of wetland natural recoverability were proposed at damaged wetland and regional scale. Furthermore, a case study was conducted in Binhai New Area, Tianjin city. The results showed that: (1) In damaged wetland scale, the area of stable wet area in Binhai New Area was 640.30 km
2, the largest proportion of the recovery area, followed by the most difficult recovery area, with an area of 381.85 km
2, accounting for 22.15%. The most difficult recovery area and the more difficult recovery area were accounted for 42.36% of the entire recovery area. (2) In regional scale, under the medium and high safety level, the area of the relatively easy recovery area of Binhai New Area was1 695.65 km
2, accounting for 82.02%. The area of low recovery area were 67.55 km
2 and 129.05 km
2, accounting for 3.27% and 6.24%, respectively.