Study on the construction of regional eco-spatial network in Qilian M ountains based on MSPA-MCR
[Objective]In recent years,due to the irrational use of land resources,overgrazing and other human factors in the Qilian Mountains,the quality of the ecological environment has declined,and the degree of regional frag-mentation has intensified.The identification of ecological networks can effectively improve the connectivity between fragmented habitats,which is of great significance in biodiversity conservation and ecological resilience.[Method]Taking the Qilian Mountains as the study area,the spatial analysis of landscape pattern(MSPA)and landscape index method were used to extract the ecological sources with good connectivity,and the minimum cumulative resistance model(MCR)was used to construct ecological corridors,analyze the existing problems of the ecological network,and optimize the ecological network structure layout in the Qilian Mountains from many aspects.[Result]1)The study area was rich in grassland resources,accounting for 44.44%of the total area of the study area.Forest land,wa-ter area and cultivated land accounted for 8.57%,4.77%and 3.21%of the total area,respectively.2)The 36 core patches with large dPC values were selected as ecological sources,and the areas of patches 36 and 35 were 18 267.98 km2 and 6 554.25 km2,respectively.The dPC values were 90.155 6 and 38.243 1,respectively,and the main cover-age areas were Menyuan Qilian Mountain Ecological Pasture,Shoulu Mountain,Tianzhu Three Gorges National For-est Park,etc.3)A total of 95 ecological corridors were identified,including 82 important corridors with a total length of 4 563.24 km and 13 general corridors with a total length of 1 069.02 km.4)The distribution of patches in the study area was optimized,and 26 important improvement areas and 77 stepping stones were identified in the opti-mized ecological network,which were mainly distributed in the central and western regions of the study area.[Conclusion]By protecting 36 core ecological sources in the Qilian Mountains,improving the quality of 26 important improvement areas,and strengthening the construction of 77 stepping stones,the ecological network has been opti-mized,and the basic structural layout of"one center,one axis,five areas,two belts,multiple points and multiple corri-dors"is presented.The landscape connectivity between the fragmented habitats is improved.The study has provided scientific suggestions for the construction of ecological civilization in this region.
Qilian Mountainsecological networkmorphological spatial pattern analysis(MSPA)minimum re-sistance value model(MCR)wildlife corridor
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