基于不同尺度源地综合识别的南昌市生态网络嵌套分析.

[Objective] The aims of this study are to investigate the spatial configuration and scale nesting characteristics of ecological networks under the two scales of Nanchang City and Nanchang City Circle, and to provide reference for regional ecological security protection. [Methods] Nanchang City Circle was taken as the research area. Based on the comprehensive sources identification framework of ‘Function-Attribute-Structure’, the ecological sources were extracted under the two scales of Nanchang City and Nanchang City Circle, and the ecological network was constructed by the Minimum Cumulative Resistance (MCR) model. Simultaneously, nested analysis of ecological corridors, ecological pinch points, and barrier points at two scales were conducted to identify similarities and differences across different scales. [Results] (1) The comprehensive ecosystem services in Nanchang City were significantly lower than those in the Nanchang City Circle. There were significant faults in the top 35% of the comprehensive ecosystem services at the two scales. Combined with the structure and attribute characteristics, 56 ecological sources were extracted at the scale of Nanchang City, and the distribution of the ecological sources was more fragmented from the east to the west, while 78 ecological sources were extracted at the scale of Nanchang City Circle, and the spatial distribution of the ecological sources was more uniform. (2) At the scale of Nanchang City, 77 ecological corridors were constructed, and the corridors connecting the east and west sources of Nanchang City were fragile. At the scale of Nanchang City Circle, 310 ecological corridors were constructed, of which 29 were used to connect the ecological sources of Nanchang City and surrounding counties and districts. The ecological sources in Nanchang City and those in surrounding counties and districts of Nanchang City had strong interaction and connection. (3) The ecological processes of two different scales in Nanchang City and Nanchang City Circle were closely related. There were 26 overlapping corridors under the two scales, a total of 611.78 km, 4 overlapping ecological pinch points and 8 overlapping barrier points. The ecological pinch points were significantly different in the northwest and east of Nanchang City, and the barrier points were significantly different in the northeast and southwest of Nanchang City. [Conclusion] Nanchang′s ecological network is relatively stable. There are many overlapping features of corridors, ecological pinch points, and barrier points in the ecological network at two scales, and they are essential for ecological conservation and restoration. The repair of overlapping elements can increase the link of the ecological network on the east and west sides of the city, as well as help to maintain the general safety and stability of the city′s ecosystem. [ABSTRACT FROM AUTHOR]