Evaluation of reclamation and utilization potential of coal mine subsidence based on connectivity analysis

The reclamation of coal mine subsidence in the new era requires the establishment of a scientific and rational agricultural development pattern.However, in the past, coal mine subsidence management projects only targeted the conditions of the plots, and less considered the connectivity between the plots, which restricted the effectiveness of reclamation and utilization.In this paper, the landscape connectivity of unrepaired coal mine subsidence and surrounding cultivated land is evaluated firstly; an index system and evaluation model for the reclamation and utilization potential of coal mine subsidence are established for reclamation guidance.Finally, this paper evaluates the reclamation and utilization potential of coal mine subsidence in the research area.The results show that the reclamation of coal mine subsidence in Xuzhou city has a high degree of contribution to the cultivated land ecological network structure after reclamation into cultivated land.The coal mine subsidence with connectivity level 1 to level 3 account for more than 98% of the total area.Xuzhou city has a total of 11 121.27 hm² of coal mine subsidence, of which 7 906.22 hm² of collapsed but no water accumulation areas have high landscape connectivity.Among them, subsidence land with reclamation utilization potential of level 1 to level 3 is suitable for reclamation as cultivated land, with an area of 6 060.57 hm², accounting for 76.65%.Evaluation of reclamation and utilization potential of coal mine subsidence based on connectivity analysis can provide a scientific basis for the special planning for the reclamation of coal mine subsidence, promote scientific and rational reclamation and utilization of coal mine subsidence areas, and alleviate the constraints of regional land use bottlenecks.