Evaluation Of Ecological Security And Construction Of Security Pattern In The Taihang Mountains Of Hebei

As an important water-containing and ecological barrier area in the Beijing-Tianjin-Hebei region,the ecological security status of Taihang Mountains is of great significance to the sustainable development of the Beijing-Tianjin-Hebei region.Identifying the ecological security level of the Taihang Mountains,constructing the ecological land protection security pattern and suggesting the optimization of ecological land pattern can effectively promote the ecological civilization construction process in the Taihang Mountains and push forward the ecological priority and green low-carbon development in the mountainous counties.Based on the natural background analysis of 28 counties in the Taihang Mountains of Hebei in 2020,this paper evaluates the ecological security level and distribution characteristics of the Taihang Mountains of Hebei from 2 aspects:ecological vulnerability and ecosystem service value.The security pattern of ecological land protection in the Hebei Taihang Mountains was constructed by the Minimum Cumulative Resistance(MCR)model using the extremely safe area and nearby forest and water areas as sources,and suggestions were made for the optimization of the ecological pattern.The main conclusions are as follows.(1)Ecological vulnerability analysis of the Taihang Mountains in Hebei.The ecological vulnerability of Hebei Taihang Mountains was evaluated and graded by constructing a mountain ecological vulnerability evaluation system through the conceptual model of"Sensitivity-Resilience-Pressure"(SRP).The most vulnerable graded area is the severely vulnerable area with an area of 10,567.05km~2,followed by the moderately vulnerable area(9,015.55km~2)with an area of 54.11%,and the overall performance of the study area is the level of moderate to severe vulnerability.In terms of spatial distribution,the vulnerability level is correlated with the land type,and the slightly vulnerable areas and mildly vulnerable areas are mostly distributed in the western areas with high forest and grassland coverage,while the heavily vulnerable areas are concentrated in the eastern areas with strong human interference in arable land and construction land.(2)Analysis of the value of ecosystem services in the Taihang Mountains of Hebei.The total value of ecosystem services in the Taihang Mountains of Hebei is 158.769 billion yuan,with the main sources being the five counties of Pingshan,Fuping,Laiyuan,Yixian,Weixian and Zhuolu counties,with regulating services being the most important service function in the region.Grassland ecosystems provide the largest value of ecosystem services,with a value of 97.370 billion yuan and a contribution of 61.33%.Ecosystem service values spatially show an obvious west-high-east-low trend,and there is an obvious positive correlation,and the aggregation type mainly shows high-high aggregation and low-low aggregation.(3)Analysis of ecological security levels in the Taihang Mountains of Hebei.The study area is mainly below the medium security level,accounting for 64.33%of the total area.The areas with high security level are mainly located in the western mountains with extensive distribution of forest and grassland and around the larger watershed,and the ecological security level in Fuping County,Laishui County,Pingshan County,Laiyuan County,Zhuolu County and Yi County is better.The ecological security index of the study area has a significant positive correlation in space,and the bivariate variables of ecological vulnerability and ecosystem service value show a negative correlation in space.(4)Construction of ecological security pattern of Hebei Taihang Mountains.The ecological security pattern of Hebei Taihang Mountains is composed of 22 ecological source sites,13 primary key points,35 secondary key points,four grade resistance areas,6010.36km ecological corridors and 2378.37km radiation channels.