| With the development of social economy and the increasing intensity of human activities,regional biological habitat is constantly threatened which resulting in a great impact on regional biodiversity.Reconstruction of ecological corridor is an important measure to construct regional ecological safety network and gradually restore biodiversity.Existing studies are not only limited to a single city scale,but also unable to translate research results into application schemes due to the lack of quantified priority of ecological corridor construction.This article closely how important ecological ecosystem restoration by constructing accurate efficient ecological protection network and restore the biodiversity science problem,through massive remote sensing data and the landscape ecology theory to reveal the regional landscape pattern evolution,rate,pattern and driving force factors.Through reconstruction,optimizing ecological corridor construction scheme,our study provides an important scientific basis for regional biodiversity protection policy making and ecological sustainable development.The main conclusions are as follows:(1)Forest landscape is an important supportive landscape for regional biodiversity conservation.In this study,all available Landsat remote sensing image datasets,climate data,topography and other multi-source data in the Xiangjiang River Basin from 1985 to 2020 were integrated through Google Earth Engine platform.Based on the improved continuous change detection and classification algorithm,the annual land use benchmark database of Xiangjiang River Basin from 1987 to 2020 was generated.In the past 30 years,the forest accumulation in Xiangjiang River Basin increased by nearly 3000 km2,which was 2.5%of the area of Xiangjiang River Basin.The area of impervious surface is also increasing gradually.The area of impervious surface in Xiangjiang River Basin has increased 1900 km2 since 1987,which is 1.8%of that in Xiangjiang River Basin.Through geographical landscape index detector integration and data analysis of social and economic development of regional forest fragmentation of driving force factors,the results show that the population density increases and road construction activities significantly reduced the integrity of forest landscape and the integrity of the structure and function of ecological system has a negative influence,embodied in the natural plaque is affected by human activities gradually fragmentation,The proportion of artificial landscape area increased significantly,the overall landscape system became complex and diverse,and the area of interlaced association between natural landscape and artificial landscape increased significantly.(2)Ecological source area protection is the core area for maintaining species reproduction and implementing ecological protection policies.On the basis of a large number of research and collection of regional biodiversity background data,a total of 1339 potential ecological sources were assessed in the Xiangjiang River Basin by studying species diffusion distribution model and habitat quality model.The total area of identified sources reached 20,092km2,accounting for 21%of the total area of the Xiangjiang River Basin.Among the identified ecological sources,there are 1226 with an area of less than 15 km2 and 23 with an area of more than 100 km2,which are highly consistent with the ecological environmental protection schemes involved in the Xiangjiang River Basin.The ecological source areas were mainly distributed in Mufu Mountain,Luoxiao Mountain,Hengshan,Yangming Mountain,Jiuning Mountain,Dupangling and Nanling in the Xiangjiang River Basin,while the areas with low elevation and gentle slope were more disturbed due to human activities,and had low habitat suitability for species as habitats.(3)Ecological corridor reconstruction is an effective means to restore biodiversity and construct ecological protection network.The potential ecological sources of The Xiangjiang River Basin were identified by constructing the resistance surface system and the minimum resistance model.The consensus was that there were 156 ecological corridors between 73 ecological sources of the Xiangjiang River Basin,and the long distance ecological corridors were mostly concentrated in the northern part of the central region,while the corridor was relatively concentrated and short in the southern part of the central region.According to the importance identification of source areas and important ecological nodes,there are 24 extremely important ecological source areas and 89 important ecological nodes in Xiangjiang River Basin.By referencing the graph theory and operational research model of classic,further optimize the construction scheme of the Xiangjiang River Basin ecological source potential,in this study found that the minimum spanning tree model can reduce the length of ecological corridor construction to the greatest extent and cumulative distance,can be eliminated drastically large-span ecological corridors,the method is to provide a variety of ecological corridor construction scheme,It provides the basis and theoretical support for the subsequent restoration of ecological landscape.Ecological corridors provide an important bridge for wildlife migration and reproduction.It is a powerful way to maintain regional ecological security to construct biodiversity protection network by connecting increasingly fragmented ecological habitats through ecological corridors.Based on long-term continuous remote sensing monitoring data and geographic information data,this study deeply understood the evolution process and driving force factors of landscape pattern in Xiangjiang River Basin,and further proposed the construction and optimization scheme of watershed scale ecological corridor.This study provides an important theoretical basis for the construction of regional ecological security pattern,verifies the operability of ecological corridor construction at the watershed scale,and has a certain applicability reference significance for regional territorial space planning and the planning,design and implementation of major ecological restoration projects. |
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