Study on comprehensive assessment of ecological security in Changbai Mountain Region based on multi-hazard natural disasters risk
NI Xiaojiao;NAN Ying;ZHU Weihong;Choi Yunsoo;LIU Guoming;LIU Chen;YAO Kuo;The department of Geography, Yanbian University;Department of Geoinformatics, City University of Seoul;Changbai Mountain Volcano Monitoring Stations;
The study, taking the Changbai Mountain Region as the study area, used DEM data,observational data of metrological station, remote sensing image data, thematic map data and statistical data as the main data sources, combined with the metrological disasters, volcanic disasters and geological disasters risk level distribution data in Changbai Mountain Region and based on PSR model. The study established the ecological security assessment index system based on multi-hazard natural disasters risk from three aspects of ecological system pressure,ecological system state and human environmental response. According to the index system,Range Method was used for index standardization, AHP was used to determine the weights of the indexes, and Comprehensive Index Method was used to calculate the ecological security index based on multi-hazard natural disasters risk. According to the ecological security criteria based on multi-hazard natural disasters risk and combined with the existing literature, the ecological security index based on multi-hazard natural disasters risk was divided into five grades of Insecurity Grade, Less Insecurity Grade, Criticality Security Grade, Less Security Grade and Security Grade, and then the ecological security level based on multi-hazard natural disasters risk in Changbai Mountain Region was then assessed based on pixel level and administrative divisions. The results showed that: the ecological security level based on multi-hazard natural disasters risk in Changbai Mountain Region reflected significant spatial differences, and represented a gradual descending trend from the central to the eastern and western ends, as well as the southern and northern sides. The area of each grade ranked as follows: Criticality Security Grade Less Security Grade Security Grade Less Insecurity Grade Insecurity Grade, and the percentages were respectively 40. 31%, 35. 77%, 10. 23%, 7. 17% and 6. 52%. In addition,the mean ecological security index and the ecological security grades were counted and analyzed based on administrative divisions. The ecological security level based on multi-hazard natural disasters risk in counties and cities ranked as follows: Changbai County Antu County Fusong County Helong City Linjiang City, and the structure of the grades varied from city to city. The Criticality Security Grade was mainly found in this region, the ecological environmental quality was at general level, which was between security grades and insecurity grades, and the system service function was damaged to some extent and was degraded. The ecological structure changed, the anti-interference ability was low, and the self-recover ability was low. The ecological problems were evident and the ecological disasters occurred occasionally. The main driving forces of the ecological environmental problems were human factors.