A Study On The Spatial And Temporal Evolution Of Landscape Ecological Security In Yuyao City,Zhejiang Province

In order to understand the landscape ecological security situation and characteristics of landscape ecological security on the Time and space changes and alalysis the reasons for the change.in Yuyao City,Zhejiang Province.In this paper,remote sensing data are used as the main data sources,and the remote sensing images of Yuyao City in Zhejiang Province,2000,2004,2009 and 2014 are classified and interpreted respectively.The data of land use are obtained,and this data is used as landscape patch data,The landscape ecological security was evaluated and analyzed by using the index analysis method,the evaluation model of the landscape ecological security and the quantitative and qualitative analysis methods on the grid scale of 1km× 1km.From the research results:(1)The landscape ecological security value of the study area in 2000,2004,2009 and 2014,with grid as the unit,was between-0.25 and 0.82 in 2004,-0.10?0.71 between 2009 and-0.3?0.82 between 2014 and-0.19?0.82,through the range of the value of the ecological security value of the study area is divided into low,low,general,high and High five grades.(2)from the time point of view,the best ecological security situation for 2014,the worst year of ecological security for 2009.(3)the area of the northern part of the grassland,the southern vegetation for the ecological security value of "high" and "higher" grade type distribution;the central construction land,water and other parts of the south is the ecological security value of "low" and "lower "The type of distribution of the grade type,the middle of the agricultural land is the landscape ecological security value"general "grade type distribution area.(4)From the perspective of the factors of landscape ecological security,land use change and vegetation cover change are the direct influencing factors of landscape ecological security.Terrain factor is an indirect factor of landscape ecological security.Through this study,we will provide theoretical basis and practical guidance for the planning,protection and development of regional ecology in order to enrich the research case and theory of landscape ecological security.