| Zixing City belongs to the Nanling Mountain Forest and Biodiversity Ecological Function Zone in the key ecological function zone of Hunan Province.The flora and fauna resources are abundant and the forest coverage rate is 59.5%.However,in recent years,under the impetus of urbanization and industrialization,Zixing City has expanded its urban scope and achieved an urbanization rate of 63.51%.At the same time,as a pilot city for new urbanization in the country,the contradiction betxween supply and demand of construction land is more prominent,and the rapid development of agricultural industrialization Agricultural environmental protection poses challenges.The unreasonable development of mineral resources has led to the deterioration of the ecological environment of the mining area,and the destruction of vegetation and the affected area of forest land reached 6837.3hm2.Economic development and nature protection have not reached equilibrium,and biodiversity has been severely damaged.At the same time,the construction of Zixing City's ecological network is not systematic.At present,there are no important plaques and corridors in the territory.There is no effective formation of large-scale ecological network system,and it is not combined with other planning and construction,and lacks scientific support..In response to the call for the construction of the 19th ecological civilization,in order to provide a scientific theoretical basis for the ecological civilization construction planning of Zixing City,this study takes Zixing City of Hunan Province as the research area.Based on Landsat in 2018,the connection is extracted by MSPA and landscape index method.A good ecological source,based on the MCR model to construct an ecological corridor network,quantitative analysis of its structure through gravity model,rational construction of ecological network within the scope of Zixing City,focus on maintaining water conservation,biodiversity and other ecological functions,It is of great significance to promote the ecological civilization construction,sustainable development and ecological economic transformation of Zixing City.At the same time,it verifics the feasibility and scientiic nature of the landscape ecological security pattern in the "Zixing City Eeological Civilization Construction Demonstration Zone Construction Plan",which provides refercence for future revision.The results show:(1)Zixing City is rich in forest land resources,accounting for 67.32%of the total area ofthe study area,the water area accounts for 4.70%of the total area,and the construction land accounts for 10.56%of the total area.The cultivated land,woodland,grassland and lakes in the area are intertwined to form the "Linxing City".-The basic landscape pattern of the lake.The landscape area of the core area in the study area accounts for 71.08%of the forest area,and the area of the bridge area only accounts for 3.02%of the forest area.Although the habitat of terrestrial organisms in Zixing City is relatively large,the migration channels as energy exchange and material flow are small and distributed,which is not conducive to species migration.(2)The 10 core regions with the largest dPC value can be used as ecological source.The area of plaque 3 and plaque 9 are 3,587.96hm2 and 2524.20 hm2,respectively.The dPC values are 65.32861 and 44.62449,respectively.Lianping Township,Longxi Township,Dongping Township,Ruding Yinshan Nature Reserve,Bamian Mountain National Nature Reserve,Swan Mountain Forest Farm,Lianping Tianshixian Sambar Deer Protection Area,Lianping Swan Mountain White Stork Reserve,Qikou Forest Farm,Longxi Huangweijiao Protection Area,Longxi Yangjiaping Sambar,Longxi Dongtang Taxus,strengthen protection in landscape planning;plaque 1,plaque 7,plaque 10 and plaque 4 Areas are 1209.06 hm2,1114.88 hm2,929,44 hm2,822.46 hm2,dPC values are 5.19300,3.955503,3.08105,2.15238,mainly located in Tangxi Scenic Area,Dongjiang Lake Ecological Protection Area,Huangcao Scenic Area,Huilong Mountain Scenic Area,Xingxing Ningjing Snake Reserve should not conflict with environmental protection when the economic transformation of the study area seeks eco-tourism development;the area of plaque 8,plaque 2,plaque 6,and plaque 5 are 362.05hm2,216.52hm2,and 180.42hm2,59.15hm2 respectively.dPC valuesare:0.43150,0.14917,0.10358,0.01113,in which plaque 5 and plaque 6 are located in the scenic area of Chengjiangkou and the eastern part of the city.Because it is close to the urban planning area,it should prevent the increasing scope of construction land from affecting biological migration and enhance its ecological quality through ecological construction..(3)Based on the MCR model,45 potential corridors were identified.18 important corridors were obtained by gravity model,and 20 general corridors were analyzed.The landscape composition was analyzed.The total area of the potential corridor was about 7491.06hm2,accounting for 81.48 of the forest land.%indicates that the forest land is the most important type of landscape structure in the potential ecological corridor of Zixing City.The regional network structure is more complicated,but the important corridors are mainly distributed in the east and south of the study area,and the corridors in the north and west are relatively fragile.(4)According to the distribution characteristics and actual conditions of the forest patch in the study area,five important corridors have been added to the optimized ecological network,mainly distributed in the northwest of the study area to solve the uneven distribution of important corridors in the study area.There are 2 planning corridors,10 stepping stone plaques,and the ecological network presents the basic framework of "three vertical and four horizontal",and its structural index has been significantly improved. |
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