Construction Of Mountain County Ecological Security Pattern Based On MCR Model

As the urbanization process in the mountains continues to accelerate,the unreasonable expansion of construction land further compresses the ecological land space.This will be a huge challenge for the entire mountain ecosystem to maintain its own stability.Ecological land is a natural habitat for species and an important area for ecosystem regulation.Once destroyed,it will cause a series of serious ecological problems such as soil erosion,desertification,environmental pollution,degradation of ecosystem functions,and loss of biodiversity.Under the conflict between economic development and environmental protection in mountainous areas,regional ecological security assessment and ecological security pattern construction provide a new perspective for solving this conflict.In this paper,Changning County is selected as the research object.For the main ecological environment problems in the region,the analytic hierarchy process is used to calculate the regional ecological sensitivity degree,and the factor equivalent method is used to calculate the importance of the regional ecosystem service value.Ning County Ecological Security Status.On this basis,the safe and safer areas in the ecological safety level are selected as the"source area"for ecological land expansion,and the current construction land with an area greater than 1km2 is used as the"source area"for construction land expansion.For the resistance surface,determine the minimum cumulative resistance difference surface of the two through a grid calculator,and delineate the three levels of ecological safety zone of high,medium and low,and identify other components at the same time,thus constructing the ecological security pattern of Changning County.The main conclusions of this study are as follows:(1)The overall ecological sensitivity of Changning County is relatively strong.The moderately sensitive area in the study area has the largest area,with an area of1112.54 km~2,accounting for 29.54%of the total area of the study area,widely distributed in the territory;followed by the highly sensitive area with an area of1001.48 km~2,accounting for 26.60%of the total area of the study area,mainly Forest areas such as Datuan Mountain in the middle of the county,Yuanding Mountain in the south,and Wutaipo in the northeast;the others are light sensitive areas of 788.87km~2,accounting for 20.95%of the total area of the study area,mainly distributed in Tianyuan Town,Kas Town,etc.Within the township;the area of the extremely sensitive area is 479.78km~2,accounting for 12.74%of the total area of the study area,mainly distributed near the Lancang River and Nujiang river basins;the area of the insensitive area is the smallest,with an area of 382.98km~2,accounting for 10.17%of the total area of the study area Distributed in the central areas of townships such as Tianyuan Town and Kejie Town.(2)The importance of ecosystem service value in Changning County is relatively high.Among them,the area of higher importance is the largest,with an area of2739.75km~2,accounting for 72.76%of the total area of the study area.Secondly,the area of general important area is 791.02km~2,accounting for 21.01%of the total area of the research area;the area of unimportant area is 145.30km~2,accounting for 3.94%of the total area of the research area;the area of extremely important area is 56.32km~2,accounting for the total area of the research area 1.50%;the area of medium importance is 33.255km~2,accounting for 0.88%.There are certain differences in spatial layout,generally showing a trend of high in the north and low in the south.(3)The overall ecological safety of Changning County is in critical safety.From the perspective of the spatial distribution of the evaluation results,the area of the critical safety level is the largest,with an area of 996.16km~2,accounting for 26.45%of the total area of the study area,and widely distributed within the county area;followed by the area with a higher safety level of 870.76km~2,accounting for the total area of the study area 23.12%,mainly distributed in the Heaven Mountain Nature Reserve in the northern part of the county,the Ai Mountain and Gulu Mountain woodland protection areas in the northeast;the area of unsafe level is 772.63km~2,accounting for 20.52%of the total area of the study area.It is mainly distributed in the central and southern areas of Changning County;the area of unsafe level is 618.18km~2,accounting for 16.42%of the total area of the study area,which is mainly distributed in the rural areas of Tianyuan Town,Kas Town,Kejie Town,etc.in the central part of the county.The security level area is 507.92km~2,accounting for 13.49%of the total area of Changning County,mainly distributed in the Lancang River Basin area;(4)The ecological security pattern of Changning County finally constructed in this paper includes:75 ecological“source areas”with an area of 733.85km~2;high-level security pattern area of 1573.31km~2;medium-level security pattern area of 1040.14km~2;low-level security pattern area of 796.20 km~2;the area of other areas is 356.18 km~2;57ecological corridors are identified,with a total length of 230.53km;a total of 65ecological strategic nodes,of which there are 8 intersections between ecological corridors and ecological corridors.There are 57 intersections.