Study on the construction of ecological security pattern in Minjiang River Basin based on circuit theory
[Objective]This study aims to accurately extract various ecological spatial elements and construct an ecological security pattern,to maintain the health and stability of river basin ecosystems,and to promote the sustainable development of ecological environmental protection.[Methods]The Minjiang River Basin was taken as the study area where the significance of ecosystem services was assessed to select ecological sources.The basic resistance surface of land use was modified through the evaluation of geological disaster sensitivity.Ecological spatial elements such as corridors,pinch points,and barrier points were quantitatively identified based on circuit theory to construct the ecological security pattern.[Results](1)With the area threshold established at 7 km2,77 ecological sources were selected,accounting for 30.77％of the total area.The key ecological sources were mainly located in the forested areas of the'Longmen-Qionglai Mountains'and the southern-central segment of the Minshan Mountains to the north,including Xuebaoding,as well as part of cultivated land and forested land in the middle and lower reaches of the Minjiang River Basin.(2)A total of 176 ecological corridors were identified,with a combined length of 2 072.96 km,of which the key ecological corridors accounted for 21.32％of the total length and were primarily concentrated in the middle reaches of the Minjiang River Basin.There were 719 ecological pinch points covering an area of 1 578.5 km2,and 163 ecological barrier points spanning an area of 2 410 km2.(3)The ecological security pattern characterized by'four zones,two belts,and one corridor'had been established for the Minjiang River Basin.Minjiang Township was taken as an example.A collaborative ecological spatial restoration approach for the'whole watershed-local unit'within the Minjiang River Basin had been explored.[Conclusion]In the context of ecological restoration,emphasis should be placed on the integration and convergence of multi-scale patterns.And a systematic and differentiated approach to ecological spatial zoning governance should be implemented to enhance ecological landscape connectivity and habitat quality,and to facilitate the circulation of materials.
ecological security patternecological restorationcircuit theoryecosystem servicesgeological disaster sensitivityMinjiang River Basin
万方数据
维普
