| China’s fourteenth five year plan proposes that new progress should be made in the construction of ecological civilization,the pattern of land and space development and protection should be optimized,and the urban and rural living environment and ecological environment should be significantly improved.Green space as an important part of urban landscape,reasonable green space planning can improve the urban environment,enhance the urban landscape,and form a perfect organic whole with other types of urban landscape,promote the construction of ecological civilization.Weifang City has experienced rapid urbanization since 1990 s,and its landscape pattern has changed dramatically.The research on the spatial-temporal changes and driving mechanism of landscape pattern from 1998 to 2018 is not only helpful to explore the impact of urbanization process on urban landscape pattern,but also helpful to analyze the relationship between green space and other landscape types in the process of urbanization and its own development mechanism,so as to provide reference for the future development and planning of green space system within the jurisdiction of Weifang City To provide theoretical basis for improving regional landscape and ecological environment.Based on the theories and methods of landscape ecology,landscape planning,remote sensing and geographic information system,this paper uses supervised classification and visual correction method to interpret remote sensing image based on five issues of remote sensing image data in 1998,2003,2008,2013 and 2018.According to the classification standard of landscape types and previous research experience,the landscape types of Weifang City are divided into seven types,namely farmland,green space,wetland,water body,salt field,construction land and unused land.Based on the interpreted remote sensing images,the spatial-temporal change characteristics of landscape pattern in Weifang City were analyzed by using landscape pattern index,land use degree model,land use dynamic degree model and landscape type transfer matrix,so as to explore the overall change trend of each landscape type and landscape,and the direction and quantity of mutual transformation between each landscape type And the dynamic process and utilization degree of the overall land change in the study area.By using GIS logistic coupling model,the database of 16 driving factors including natural factors and human factors was established to explore the driving forces of spatiotemporal changes of farmland,construction land and green space landscape pattern in Weifang City.Based on the above research results,this paper focuses on the analysis of the change and development of green space in the landscape pattern change and the relationship between green space and other landscape types,and then studies and judges the future development trend of green space system,so as to scientifically and comprehensively design the optimization scheme of green space system.The results show that:(1)From 1998 to 2018,the landscape pattern characteristics of Weifang city changed significantly.The number and density of patches increased year by year,the spread index decreased year by year,and the landscape fragmentation deepened.The overall landscape patch shape is more regular,the landscape types are more and more abundant,and the patch gradually presents the spatial characteristics of uniform distribution.(2)From 1998 to 2018,the area of farmland and salt field decreased significantly,the area of construction land and green space increased significantly,and the water area was basically stable;the area of wetland and unused land in each stage was small,and the change range was large.Farmland,construction land and green space are the main landscape types in the study area.In the past 20 years,the area of green space has increased by nearly 30000 Hm2,and the main transfer sources are farmland and construction land.(3)Slope,total power of agricultural machinery,per capita net income of rural residents and distance from road are the main driving factors of farmland landscape change.GDP,the proportion of the added value of the tertiary industry,the per capita disposable income of urban residents,the distance from the road,the distance from the railway are the main driving factors of the landscape change of construction land.Slope aspect,proportion of urban population,distance from river,road and railway are the main driving factors affecting the change of green space.(4)At present,the landscape fragmentation of green space is high,the connectivity is low,and the green space is mainly concentrated near the central city;the major green space groups are isolated from each other,and lack of corridor connection for ecological exchange.Therefore,this paper puts forward the green space system optimization scheme of "two centers,three networks,four corridors and multi-point promotion". |
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