Establishment of ecological security pattern along the Yellow River in Shaanxi Province based on ERA and MCR models
Regional ecological risk assessment and optimization of ecological security patterns are important measures to achieve biodiversity conservation and sustainable development.This study evaluated the ecological risk level along the Yellow River in Shaanxi by establishing a multi-source risk index system and investigating the landscape structural changes in the past two decades.Meanwhile,the ecological security pattern of the study area was constructed by adopting the paradigm of"source-resistance-corridor"and identifying ecological nodes and ecological breakpoints.The results indicate that there are significant differences in the spatial distribution of ecological risks within the study area,with low-value areas mainly present in the north and south while high-value areas primarily in the middle region.And over the past 20 years,the ecological core area has increased significantly in size but remains fragmented,with a decreasing proportion of feeder routes and a low connectivity.Then,there are 22 important ecological sources covering a total area of 4655.73km2,and a total of 53 important ecological corridors have been extracted to form an overall ecological security pattern characterized by"one belt,three zones and multiple corridors".Additionally,43ecological nodes and 98ecological fracture points have been identified,having denser ecological corridors and nodes in the northern part of the study area.Finally,low ecological network closure and poor north-south connectivity in the study area.In the future,ecological security pattern needs to be optimized by planning stepping-stone,restoring ecological breakpoints and upgrading nine potential corridors in line with regional ecological risk level.We believe that this study can provide scientific basis for the conservation of natural ecosystems and biodiversity along the Yellow River in Shaanxi Province,and contribute to the ecological conservation and high-quality development of the Yellow River Basin.
ecological risk assessment(ERA)MSPA modelMCR modelecological security patternalong the Yellow River in Shaanxi Province
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