Research On The Ecological Security Assessment And Pattern Optimization Of Regional Landscape

Landscape provides absolutely necessary material resources and ecological environmental for the development of human beings while human’s social and economic activities are interfering with natural ecological process in different degree; Such interference will decrease the ecological regulation ability of regional ecological system and threaten regional land ecological security with more and more intense regional human-land conflict. Landscape ecology theoretical methods provide new ideas and means for the study of land ecological security. Based on the landscape ecology theory, this paper took Pei County of Jiangsu province as research example to recognize regional land ecological security pattern on the basis of landscape ecological security evaluation and carry out simulation and optimization of regional landscape pattern for maintaining and constructing land ecological security pattern and reducing the threats to ecological environment.(1)Choosing indexes from two aspects of landscape fragmentation degree and connection degree which affect regional ecological security pattern to establish index system, this paper constructed evaluation model with multi-factors weight index function method based on information entropy to respectively evaluate the ecological security condition of farmland landscape, water landscape and wetland landscape in 1991,2004 and 2014.The results showed that the ecological security value of farmland landscape and water landscape first increased and then decreased, and the wetland’s increased.(2)The paper took minimum cumulative resistance model to construct the cost surface of landscape ecological flow operation, and then recognized landscape ecological security pattern composed by ecological source, ecological corridor and ecological nodes; And ecological security spatial pattern of existing landscape was also analyzed from the aspects of ecological source protection, ecological corridor construction and ecological nodes strengthening to provide foundation for the simulation and optimization of landscape pattern.(3)Basing on earth landscape types changes analysis of research area, landscape types conversion natural driving factors analysis and regional landscape ecological security pattern recognition, the paper simulated and optimized the land use pattern in target year by CA-Markov model and tested the simulation and optimization result. The study showed that the simulation and optimization result is accord with the actual trend of the earth landscape change in research area, and it relieved the trend of ecological source landscape fragmentation degree increase, landscape connection decrease and the threats to ecological security.