Research On The Construction Of Ecological Security Pattern In Nuiiang Prefecture Based On GIS And RS

With the continuous advancement of urbanization and industrialization,the originally stable ecological security pattern has been broken,and the contradiction between regional ecological environmental protection and social and economic development has become increasingly prominent.Building an ecological security pattern is a key means to improve the regional ecological environment and ensure regional ecological security.The current research paradigm for constructing an ecological security pattern has been relatively complete,but its constituent elements,construction methods and construction models have not yet been unified,resulting in certain differences in construction results,and weak reference for urban planning.The topography and geomorphology characteristics of the alpine valley area are complex and sensitive,which is a difficult area to construct an ecological security pattern,This paper takes the Nujiang Lisu Autonomous Prefecture(hereinafter referred to as Nujiang Prefecture),a typical alpine valley region,as the research object.Based on GIS and RS technology,construct a framework of"importance-sensitivity-connectivity",identify ecological sources,use the MCR model to establish the minimum cumulative resistance surface,and then identify other key components:ecological centroid,ecological buffer zone,ecological corridor and The ecological strategy node is to construct the ecological security pattern of Nujiang Prefecture,optimize the ecological spatial structure of Nujiang Prefecture,and provide references for ecological protection and urban expansion in Nujiang Prefecture.In summary,the conclusions obtained from the full text are as follows:(1)The spatial distribution characteristics of the importance of ecosystem service functions in Nujiang Prefecture are:high in the north and low in the west,high in the west and low in the east.The high-level areas of the importance of ecosystem services are mainly distributed in the northern section of the Gaoligongshan National Nature Reserve,and these high-value areas should be allocated to the ecological protection red line as far as possible in order to effectively protect the ecosystem.(2)Ecologically highly sensitive areas are mainly distributed in discontinuous strips along the banks of the SALWEEN RIVER,Lancang River and Hangteng River.This area is highly sensitive to human activities and should be developed with caution after geological hazards and soil erosion prevention work has been done.(3)The importance of the ecological patches in Nujiang varies considerably,with the high-ranking patches being distributed in patches in the Gaoligong Mountain Nature Reserve,the southern section of the Nujiang Grand Canyon National Park,and parts of the Yunling Nature Reserve.These patches play an important role in the overall connectivity of the region and should be maintained as much as possible in the subsequent ecological protection and landscape planning.(4)This study identified a total of:ecological source areas of 4807.69km~2,ccounting for 32.70%of the total area of Nujiang Prefecture;14 ecological plasmas;ecological buffer zones of 11548.6929km~2,accounting for 78.55%of the total area of Nujiang Prefecture;81 ecological corridors,with a total length of 1260.266km;3 river corridors,with a total length of 550.472km;radiation channels 85;67 ecological strategic nodes,including 22 strategic points,24 breakpoints and 21 transient points,which together form the ecological security pattern of Nujiang Prefecture.