Spatial Scale Analysis And Vulnerability Researchi On Landscape Pattern Of Zhalong Wetland

The vulnerability of landscape pattern reflects the degree of instability of the ecosystem and its sensitivity to external disturbances,and the scale problem is the foundation of all landscape ecology studies.Therefore,this paper selects the Zhalong wetland as the study area,takes the landscape pattern characteristics of 2000 as taking remote sensing,GIS technology and index analysis software Fragstas4.2 for example,the landscape pattern index of Zhalong wetland was analyzed systematically with the change of grain size and scope from two aspects of the grain effect and scope,and get the best landscape of Zhalong wetland analyze the scale.Based on the best analysis scale and based on the theories of remote sensing,geographic information research and landscape ecology,taking Landsat TM images of 2000 and 2013 as the basic data,using the principle of landscape ecology and geographic information technology 2000 and2013.Based on this,the landscape vulnerability indices were constructed using landscape fitness and landscape sensitivity index,and then the calculated values of landscape vulnerability were interpolated using ArcGIS geostatistics tools to obtain the Landscape vulnerability spatial distribution map,so as to analyze the vulnerability of landscape in Zhalong wetland.Finally,the following research results were obtained:(1)There is grain effect in the landscape pattern of Zhalong wetland.Based on the classification data of landscape pattern in 2005 and 2016,and divided into 10 different grain at intervals of 30 m,this paper studied the characteristics of landscape pattern index under different spatial granularity,and found that with the granularity of landscape index changes,indicating that changes in grain size have a significant impact on the landscape pattern,that is,there is a grain effect.(2)Determination of the best spatial scale of landscape research in Zhalong wetland.Due to the existence of particle size effect,this paper must determine the best spatial analysis scale when studying the landscape pattern of Zhalong wetland.The spatial scale can be expressed in terms of grain effect and scope.Therefore,taking the2000 landscape as an example,we firstly classify the landscape pattern classification data into 5 different intervals and re-sampling them into 30 different grain sizes to analyze the trend of the change of landscape index with grain size uusing the first-scale domain as the best analytical scale,the optimal particle size was 15 m.The second stepis to use ArcGIS tool to divide the optimal grain data into seven different scope.Finally,using the semi-variogram theory and the first-scale scale as the best analysis scale,the best research range of Zhalong wetland is 1500 * 1500 m.(3)The landscape pattern of Zhalong wetland changed obviously.Based on the best spatial analysis scale,Fragstats4.2 software was used to calculate the area and proportion of each landscape type in 2000 and 2013 based on landscape pattern index method.We found that the landscape pattern of Zhalong wetland changed very much from 2000 to 2013 obvious.During the study period,the area of lake marsh changed most.However,swamps(swamps with surface water and swamps without surface water)are reduced in size.Overall,the area of lake marsh in Zhalong wetland has the largest change,with the smallest change in farmland and village area.In addition,due to the implementation of wetland protection measures in recent years,a large number of residents have moved out of the core areas of wetlands,causing some residents to reduce their land area and converting part of their cultivated land into meadows and meadows.(4)The overall landscape vulnerability of Zhalong wetland shows a decreasing trend.Compared with 2000,by 2013,the areas of lower vulnerability,lower vulnerability and lower-middle vulnerability with lower vulnerabilities have all been reduced,with the exception of areas with potentially more vulnerable areas but higher vulnerabilities And high fragile areas are reduced.Therefore,we can conclude that the landscape pattern vulnerability of Zhalong wetland shows a decreasing trend overall in2013 and 2000,and the areas with reduced vulnerability are mostly the marginal parts of Zhalong wetland,while the high vulnerability There is a tendency to move to the center part.Through remote sensing,landscape index method and ArcGIS technology,this paper determines the best analysis scale and change characteristics of landscape pattern and vulnerability analysis of scales,in order to provide scientific basis for the protection and restoration of Zhalong wetland,rational development and utilization,landscape planning and optimization Provide a new theoretical basis and visual.