Construction Of Ecological Security Pattern In Jinan City Based On MSPA

With the deepening of human understanding of the relationship between man and land,human beings are more yearning for "green civilization".In the 12 th Party Congress of Jinan,it was put forward that adhering to ecological priority and green development is one of the important goals for the future development of Jinan.In recent years,with the rapid urbanization of Jinan,there have been ecological and environmental problems such as groundwater resource depletion,urban pollution intensification,and ecological diversity reduction,which have greatly affected the ecological system of Jinan.The establishment of ecological security pattern is an effective measure to improve the self-regulation ability of the ecological system and shift from the end quality to the source protection.Based on this,this study took Jinan City as the research area,identified the ecological source by combining morphological spatial pattern analysis(MSPA)and landscape connectivity analysis,identified the ecological corridor and ecological node by Linkage Mapper based on the circuit theory,constructed the ecological security pattern and put forward optimization suggestions.The conclusions of the paper are as follows:(1)The main landscape types of Jinan are cultivated land and forest land,with an area of3,446 square kilometers of cultivated land and 2,480 square kilometers of forest land.The cultivated land is mainly distributed in the northern plain area,Shanghe County,Jiyang District and Zhangqiu District,while the woodland land is mainly distributed in the southern hilly area,Laiwu District,Licheng District and Changqing District.At the same time,the grassland area is about 267 square kilometers.This paper uses Guidos software to conduct MSPA analysis with forest land and grassland as foreground data and combines with landscape connectivity analysis to identify ecological source areas in the study area.Finally,57 ecological sources were identified,of which 67.26% were the ecological patches in the core area,and 1.23% were the ecological patches in the bridging area,which was too small.The data results show that the ecological source area of Jinan is large,which can provide a large plot for species reproduction needs.However,the distribution of ecological source is too concentrated,which is not conducive to species migration and material and energy exchange among sources.(2)Based on the important connectivity index of d PC,the top ten core areas with connectivity are selected as important ecological source areas for priority protection.The selected ecological source areas include Pingyin Dazhai Mountain Nature Reserve,Dafengshan Nature Reserve,Laiwu State-owned Huashan Forest Farm Nature Reserve and Liupu City Nature Reserve,and the protection of these areas should be strengthened in landscape planning.According to the order of ecological source connectivity,the largest four ecological sources were patch 30,patch 18,patch 28 and patch 41,with an area of348.95km2,130.64km2,113.48km2 and 82.61km2,respectively.The dpc value was: 74.98,21.99,113.48 and 82.61,mainly located in the southern hilly region and the eastern region.For the southern hilly region and the eastern region,the ecological source areas are characterized by relatively clustered distribution,larger patch area,more complete ecological service function,and greater impact on ecological connectivity.According to the distribution characteristics of this kind of ecological source area,priority protection should be given in the actual planning.For patches 9,12,8,10,etc.,the area of ecological source was 5.88km2,29.37km2,8.39km2,5.89km2,and the dpc value was 1.31,5.50,0.08,0.98.The distribution characteristics of ecological source were scattered patches distributed around the city.Compared with the ecological patches in the southern and eastern regions,the patch area is relatively small.This kind of ecological source area is usually close to the urban construction land and usually distributed around the urban area.Therefore,forbidden areas and buffer zones should be set up to improve the service quality of this kind of ecological source area.(3)Linkage Mapper was used to build ecological corridors and ecological nodes in the study area,and 94 ecological corridors,135 ecological spots and 38 ecological barrier points were built.Through the corridor dominance degree of Linkage Mapper,the ecological corridor was further analyzed,and the ecological corridor was divided into three-level ecological corridor,with 35 first-level ecological corridors,47 second-level ecological corridors and 12 third-level ecological corridors.Results In the data,the proportion of first-level corridors and second-level corridors in the total number of corridors is too large,indicating that the overall ecological resistance value of the study area is too high,and it is necessary to strengthen the protection of ecological corridors.Among them,the first-level ecological corridors are concentrated in the urban construction land area across the city,and the possibility of biological migration through this corridor is higher,but its stability is weaker.This kind of ecological corridors should be protected first,so as to guarantee the function of the ecological system in the urban construction land area and improve the ecological quality.In addition,it is necessary to strengthen the construction and restoration of ecological sandwiches and ecological obstacles,move closer to the ecological security pattern of "more corridors and more water in the south mountains and north rivers",and strengthen the overall ecosystem service function of Jinan City.