Abstract
Context
The major goal of ecological security patterns (ESPs) is to identify key ecological sources and corridors, which play an important role in achieving regional sustainability. Although an increasing number of reviews have been published on constructing ESPs, reasonably prioritizing ecological corridors to maintain vital ecological processes and landscape connectivity remains a challenge.
Objective
This study aimed to provide guidance for landscape management and decision making by developing an evaluation framework to construct ESPs and further prioritize potential corridors.
Methods
Taking Jiangsu Province as a study area, we identified ecological sources by considering three key ecosystem services (biodiversity, carbon storage and water yield) and three ecological sensitivity indicators (soil erosion sensitivity, water sensitivity and habitat sensitivity) using the InVEST model, RULSE model and GIS spatial overlay analysis. Then, ecological corridors were delineated with the least-cost path method, and the ESPs were obtained by combining these corridors with ecological sources. We further prioritized ecological corridors based on the gravity model and the probability of connectivity index.
Results
The ESPs of Jiangsu Province contained 51 patches and 37 corridors. The total area of the ecological patches was 15,170.51 km2, accounting for 14.61% of the study area and primarily consisting of water bodies, cropland and forestland. Ecological corridors comprised 1920.38 km and were divided into four quadrants via a precedence matrix. The sixteen ecological corridors in the first quadrant (high importance and strong connectivity) were defined as priority areas and occupied 39.50% of the total corridor length.
Conclusion
Our methodology framework offers a valuable tool for constructing ESPs and prioritizing corridors at the regional scale. This framework incorporates targeted ecosystem services and ecological vulnerability indicators to systematically assess and identify key ecological space. The conservation of ecological corridors selected in light of their importance and contribution to enhancing connectivity is a more targeted measure. It could be applied to other landscapes and geographical contexts.
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Acknowledgments
The authors acknowledge the support from the Ministry of Science and Technology, China (2018YFD1100103), the 111 project, China (B17024), the National Natural Science Foundation of China (71774085, 71774086), the Chinese Academy of Sciences (XDA23020201), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX19_0598).
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Xiao, S., Wu, W., Guo, J. et al. An evaluation framework for designing ecological security patterns and prioritizing ecological corridors: application in Jiangsu Province, China. Landscape Ecol 35, 2517–2534 (2020). https://doi.org/10.1007/s10980-020-01113-6
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DOI: https://doi.org/10.1007/s10980-020-01113-6