The Construction Of Land Use Ecological Security Pattern In Zhidan County Based On MCR Model

With the development of social economy,the process of urbanization is accelerating,and the demand for construction land is increasing day by day.The construction land is expanding and invading the ecological land space.The irrational exploitation and destruction of ecological land will produce greenhouse effect,grassland degradation,land Desertification,soil erosion,soil,air and water pollution and etc.They seriously affected the proliferation of biological activities,ecosystem services and regional ecosystem capacity,resulting in the loss of biodiversity,ecosystem regulation And ecological degradation and a series of serious consequences.The land ecosystem security is the foundation of the sustainable use of land resources.The pattern of land use ecological security refers to the spatial distribution and allocation of land use ecological security elements which are composed of some points,lines and faces in a certain space.Human in the pattern of natural space on the basis of land through the formation of the pattern.In particular,the land use ecological security pattern is to protect the ecological environment,based on the understanding of the present situation of the regional ecological environment,the regional natural and human elements of the planning and design and layout of the composition of the land use of ecological security elements,which provides a new method for ecological environment management and protection.In this paper,the land ecological security of Zhidan County is taken as the research object.Based on the actual situation of Zhidan County and the previous research results,the value of ecosystem services in Zhidan County is calculated,and the change of ecosystem service value is analyzed.Thus,the forest area with high value of ecological service value,ecological control area,nature reserve,water area and large area is selected as the ecological source,the town and the town are established by using the minimum cumulative resistance model(MCR).The village is the source of the town.According to the actual situation of Zhidan County,considering the slope factors,the land use type,the distance from the river,the distance from the road,and the distance resistance from the town,the weight of the resistance factor is determined by the analytic hierarchy process.By calculating the minimum cumulative resistance surface The ecological security zone of Zhidan County is established,and the ecological security area of Zhidan County is established.The ecological security zone of Zhidan County is established.The research shows:(1)The total value of ecosystem services in Zhidan County was 331,085.11 million yuan in 2010,330789.25 million yuan in 2012,330618.46 million yuan in 2014,330409.73 million yuan in 2016,showing a downward trend year by year,the total value of ecosystem services in the 2010-2016 a total reduction of 6,753,800 yuan,the urgent need to strengthen the protection of ecosystems.In terms of land use type,forest land and grassland contributed the most to the ecosystem service value of Zhidan County.From the single ecological service function,the soil formation condition and protection function of Zhidan County were the highest,followed by gas regulation function,Biodiversity conservation functions and water conservation functions.(2)In this paper,we use the minimum cumulative resistance model to finalize the 50 ecological corridors of Zhidan County,230 radiation channels and 57 ecological strategic nodes,and divide Zhidan County into three levels of ecological security zone,And identified the buffer zone,together constitute the ecological security pattern of land use in Zhidan County.The total area of ecology safe area of Zhidan County is 281740.50 hectares,accounting for 74.26% of the total land area of the county;the buffer area is 229398.56 hectares,accounting for 60.46% of the total land area of the county.The minimum cumulative resistance difference between the high level ecological security zone in Zhidan County is between-40426.50 and-10705.44,with an area of 45105.79 hectares,accounting for 11.89% of the total land area of the county.It is mainly distributed in the south and southeast of the county area.The ecological growth zone in Zhidan County,the minimum cumulative resistance difference between-10705.44 to 0,an area of 103873.16 hectares,accounting for the county's total land area of the total area of the land 27.38%,mainly distributed in the high-level ecological security area outside the county and the northwest,the area should focus on the protection of the ecological environment,damage to the function of the ecosystem development and construction activities strictly prohibited;Zhidan County low-level ecological security zone minimum The cumulative resistance difference is between 0 and 14212.20,with an area of 132761.54 hectares,accounting for 34.99% of the total land area ofthe county.It is mainly distributed in the middle and north of the county.It is a transition area for ecological land,agricultural production land and construction land.The county should develop and utilize the area within a reasonable limit.