Study On The Coupling Mechanism Of Land Use Landscape Pattern And Ecological Security In The Agricultural-Pastoral Ecotone Of Northern Shaanxi

Ecological security is an important indicator for measuring the national economy and people's livelihood,and it has a major impact on the sustainable development of the economy and society.The report of the 18 th National Congress of the Communist Party of China(CPC)has integrated the construction of ecological civilization into "Five-point Strategy",which reflects the Central Committee of CPC has attached great importance to the issue of national ecological security.The construction of ecological civilization was promoted to the "millennial plan for the development of the Chinese nation" in the report of the 19 th National Congress.The interaction between various parts of the ecosystem is complex and abstract,and it is not easy to directly describe and analyze the ecological security status.Therefore,people begin to reflect the structure and function of the ecosystem through the study of landscape structure.situation.Based on the theory of landscape ecology,system theory and hierarchy theory,the study selects the typical ecologically fragile zone — the agricultural-pastoral ecotone in northern Shaanxi as the research object.Using remote sensing,geographic information technology and statistical methods to analyse the change characteristics of land use landscape in research area.Based on the triangular model,combined with the economic,social and natural characteristics of the study area,an ecological safety evaluation system was established.Then,based on the coupling mechanism research method,the correlation analysis method,the regression analysis method and the coupling coordination degree model were used to measure the mutual influence and interaction degree between the landscape index and the ecological safety index.The research results can lay a foundation for exploring the coupling mechanism of ecological security and land use landscape pattern,and provide the allocation basis of land use for achieving an efficient and safe landscape pattern in Agro-pastoral zone in northern Shaanxi.The research indicates:(1)From the overall perspective of the landscape pattern of the study area,the landscape fragmentation index and shape index have continued to increase in recent years,the overall degree of disturbance of the landscape is increasing.The diversity of the landscape is maintained in a stable state,the degree of aggregation is increased,and the connectivity and order of the landscape are enhanced.(2)From 2005 to 2010,the data of EFI,SAI and REI have increased to a large extent.The data growth rate in 2010-2015 has become smaller,but it has maintained a relatively stable growth level.In 2015,the ecological environment has reached a relatively stable security state,and it is still developing in a better direction.(3)The landscape indices CONTAG,SHDI,and SHEI are significantly related to ecological security.The highly correlated indices represent the land use landscape pattern and ecological security status to measure their coupling degree.The results show that the coupling degree and coupling coordination degree between the landscape index and the ecological security state of the study area have been rising,the land use landscape pattern is more and more orderly,and the ecological environment is more and more harmonious.