Abstract: Coral reef ecosystems are seriously threatened by environmental changes and human activities. Protecting coral reef ecosystems is a hotspot in global marine ecosystem conservation. Quantitative assessment of ecological vulnerability of coral reefs would provide important scientific basis for coral reef conservation management. Taking Si Chang Island, Thailand as the study area, a versatile vulnerability assessment approach was developed combined with spatial analysis technology. Based on the ESA model, a comprehensive vulnerability index and related indicators were built for coral reefs. The source and composition of coral reef vulnerability were identified using the established model, while the spatial distribution of vulnerability was visually displayed. The results showed that the vulnerability of coral reef on northeast side was greater than that on the southwest side of the Si Chang Island. The key impact factors of local coral reefs were tug sewage, harbors and piers, water transparency, etc. The zoning management countermeasures were proposed for the conservation and restoration of coral reefs based on our findings. This study provided a feasible example for the ecological vulnerability assessment of Indo-Pacific reefs, and can also be taken as a reference for the sustainable management of coral reefs in China.

Key words: adaptability., Alhagi sparsifolia, ion, saline and alkaline land