Identification And Optimization Of Ecological Network In Maanshan City Based On MSPA And MCR Models

The rapid development of cities has resulted in the fragmentation of a large number of regional habitat patches.The scientific and rational construction of an urban ecological network can effectively connect regional habitat patches and effectively maintain local biodiversity and ecological security.This paper selects Ma’anshan City,Anhui Province as the research object.First,the Fragstats landscape pattern analysis software is used to analyze the changes of land use and landscape pattern in Ma’anshan City from 2010 to2020;The method of combining MSPA with the minimum area of habitat patches and the optimal distance threshold for landscape connectivity analysis was used to identify ecological sources;then,based on the MCR model,the potential ecological corridors in Ma’anshan City were identified,and the gravity model was used to extract important ecological corridors;The identified ecological network is evaluated and optimized.The research results can provide a scientific basis for the identification and optimization of the ecological network in Ma’anshan City,and provide a scientific reference for its future work on the protection and restoration of the territorial space ecology.The main findings are as follows:(1)The change order of land use transfer area in Ma’anshan City from 2010 to 2020 is:cultivated land>water body>artificial surface>woodland>grassland>wetland.Based on the change of land use,the landscape pattern index was analyzed.Among them,the degree of land fragmentation of cultivated land,forest land,grassland,water body and artificial surface has been improved,and the degree of fragmentation of wetland landscape has been deepened;the grassland patch structure is relatively scattered;the separation index of grassland and wetland landscape is 1,indicating that it is most seriously divided by traffic roads;from the overall point of view,the overall landscape patch connectivity of Ma’anshan City from 2010 to 2020 is slightly enhanced,and the ecological fragmentation is fragmented.The problem has been improved,but there are still some landscape ecological problems that need to be solved.(2)The total area of ecological sources in Ma’anshan City in 2020 is 972.71 km~2.Through the analysis of patch number,area and landscape connectivity,it is determined that the minimum area threshold of Ma’anshan habitat patches is 0.5 km~2,and the optimal distance threshold is 200 m,a total of 14 ecological sources and 91 ecological corridors were identified.The spatial distribution of large patches is uneven,mainly in the northwest,middle and southeast;the ecological network connectivity between the northwest and the middle and the east is poor,and the comprehensive resistance is high in the middle and east and low on both sides;the traffic road network in the middle and east There are many ecological break points,and the ecological environment needs to be strengthened.(3)The optimized ecological network of Ma’anshan City includes 17 ecological sources and 136 potential ecological corridors,including 9 important corridors and 11 stepping stones,and identified 42 ecological breakpoints.Theα,β,andγindices increased from3.39,6.50,and 2.53 before optimization to 4.14,8.00,and 3.02.The optimized ecological network improved the connectivity between regional ecological patches and enhanced the stability of the Ma’anshan ecosystem.