Research On The Construction Of Ecological Security Pattern Of Panlong River Basin Based On The Evolution Of Landscape Pattern

In the context of rapid urbanization,studying the pattern of ecological security is particularly important to alleviate the contradiction between man and land.The Panlong River Basin is an important part of the Dianchi Lake Basin,and it has a supporting effect on the ecological environment protection of Dianchi Lake and the sustainable development of Kunming City.In recent years,with the development and construction of Kunming city,the ecological environment has been destroyed,but it has also affected the living environment of human beings.Therefore,it is of great significance to construct the ecological security pattern of the Panlong River basin based on the evolution of landscape pattern.The thesis takes the Panlong River basin as the research object,based on the 4 remote sensing images in 2000,2007,2013 and 2020,using digital models and landscape pattern indexes to analyze the land use,landscape pattern changes and ecological security of the basin,And build the ecological security pattern of the Panlong River Basin through the minimum cumulative resistance model,and draws the following conclusions:(1)Over the past 20 years,construction land has continued to increase,but it is fragmented and has various shapes.The fragmentation of arable land has intensified,but the shape of the landscape tends to be simple.The overall dominance of woodland area is relatively high,but the area is decreasing,and it is mainly transformed into grassland and cultivated land.The overall landscape fragmentation of the river basin has increased,the degree of heterogeneity has increased,and the connectivity of the landscape has decreased.(2)During the study period,the watershed landscape safety degree was above 0.8,and showed a trend of first increasing and then decreasing.The ecological safety of construction land and forest land are high and relatively stable,and they have been in a safe state.Cultivated land will be raised from relatively safe to early warning in2020.(3)Identify the ecological source area of 133.57km~2 and 12 ecological nodes.The five grades of eco-safety zones of low,low,medium,high and high generation accounted for 52.48%,25.89%,13.58%,4.95%and 3.10%of the basin respectively.There are 12 ecological corridors with a length of 331.28km and 68 radial corridors with a total length of 255.19km.