Research On Evolution Of Urban Landscape Pattern In Shanghang County Based On GIS

With the continuous increase of urban population and the continuous expansion of urban scale,the original urban landscape structure,urban morphology,and urban function will certainly have great changes.Various studies show that many ecological and environmental problems in urban development are related to unreasonable urban landscape structure.In Shanghang county city in 2009,remote sensing images in 2013 and 2017,together with the present situation of urban topographic map,comprehensive,overall urban planning,the related statistical data and field investigation,using sustainable development theory,landscape ecology and human relations coordination theory,based on the GIS platform to establish database of urban landscape,the landscape pattern index analysis,CA-Markov model analysis,multiple linear regression analysis method of Shanghang county urban landscape pattern evolution study,the research results are as follows:(1)During the research period,various landscape types have changed to varying degrees,which are mainly reflected in the large increase of urban residential landscape,other construction land landscape,green land and square landscape,and road landscape area.The agricultural landscape and forest landscape show a continuous decrease trend,and the water landscape area reaches the minimum value in 2013.Shanghang county urban landscape transferred out area of cultivated land within the largest,mainly to urban residential landscape,landscape and other construction land road landscape transformation,all kinds of landscape constantly take up agricultural landscape,reduce the agricultural landscape is mainly caused by the expansion of the city,at the same time also exist in rural residential landscape,green space and square landscape to agricultural landscape rotation;The interaction between water landscape and green space and square landscape is active.Overall concentration showed a trend of decrease in the study area,the number of patches,the increasing trend of evenness and diversity index,landscape fragmentation,landscape type in the landscape space showed a trend of equalization,diversified distribution,on the whole landscape of the biggest contribution to the agricultural landscape dominance index decreased,but still is the study of advantages in the area of landscape types.(2)The simulation study with CA-Markov model shows that:by 2025,the urban residential landscape,other construction land landscape,green land and square landscape in the study area show a growing trend,while the rural residential landscape,agricultural landscape and forest landscape show a decreasing trend,and all tend to be balanced and stable in 2025.The overall fragmentation degree of the landscape pattern increased,showing a high degree of heterogeneity,but the degree of aggregation of the landscape slowed down,the landscape distribution is more uniform;The landscape types in the study area gradually develop towards the equilibrium direction in the landscape space,which is in line with the urbanization development process in the study area.(3)Analysis of leading factors of landscape pattern evolution shows that:urban residential landscape,other construction land landscape,green land and square landscape,road landscape and social and economic factors other than the proportion of the primary industry all show a high positive correlation degree,while agricultural landscape and woodland landscape are on the contrary.The correlation between rural residential landscape,water landscape and social economic factors is not high.Through multiple linear regression analysis,it can be seen that the leading factors of urban landscape evolution in Shanghang county are:urban residential landscape,other construction land landscape,green land and square landscape,agricultural landscape and road landscape.These landscape types show high sensitivity to social and economic impact factors.(4)According to the above research on Shanghang county urban landscape development put forward countermeasures and suggestions:(1)optimize the layout of landscape space and reasonably divide the functional zones;(2)improve rural living conditions,prevent the excessive flow of rural population into the city;(3)macro social and economic regulation,guiding the direction of urban pattern change,through the control of several types of social and economic factors,to achieve the regulation of the area of a certain landscape,so as to optimize the urban landscape pattern;We will increase control over the use of land for construction and arable land,and increase the intensive use of land for construction and arable land.(5)strengthen ecological environment protection and construction,improve the landscape connectivity;(6)3S technology is used for dynamic monitoring of landscape pattern,to obtain timely landscape pattern data,control the evolution process and direction of landscape pattern.