The Impact Of Development Intensity On The Urban And Rural Green Space Landscape Pattern In Zhengzhou,China

High-intensity urbanization has caused great changes in urban and rural land use patterns.The continuous spread of construction land will encroach on the urban and rural green space,which will lead to a decline in the quality of the ecological environment.It is the basis for achieving sustainable urban development that clarifying the spatio-temporal response relationship of urban and rural green space to development intensity,and optimizing the spatial pattern of urban and rural green space according to the current urban development intensity in the process of urbanization.This paper takes 2000,2009 and 2017 as the research time,using entropy TOPSIS model,landscape pattern index,bivariate spatial autocorrelation and other methods to quantitatively analyze the spatiotemporal characteristics of the development intensity and the urban and rural green landscape pattern in Zhengzhou city.The purpose is to find out the basic situation of the current development intensity and the landscape pattern of urban and rural green space in Zhengzhou,and to study the space-time influence of development intensity on green space landscape,so as to provide theoretical basis for the sustainable development of the city and the ecological environment protection and restoration work.The main conclusions of the thesis are as follows:(1)The average urban development intensity of Zhengzhou City is 0.206,0.245 and 0.240 respectively in 2000/2009/2017.In urban and rural areas,the development intensity increased from 2000 to 2009,and the it decreased from 2009 to 2017.Largescale green space construction diluted the development intensity of urban and rural areas;and the development intensity of urban-rural junctions continued to increase.During this period,the urban development of Zhengzhou was centered on the main urban area,with the east as the main body,and continued to expand to the surrounding satellite towns.The development intensity difference between urban and rural areas gradually narrowed,and the city developed in the direction of flattening.In the early stage of urbanization construction,due to the constraints of social and economic conditions,the first choice for urban development is to develop in the eastern plains where the degree of maturation is higher and the construction cost is lower.(2)From 2000 to 2017,urban and rural green space increased by 1459.91 km2 in Zengzhou,and the newly added green space was mainly distributed in the urban-rural integration zone and the east of city;in the two time periods of 2000-2009 and 20092017,the number of urban and rural green patches increased first and then decreased,the connectivity between patches first decreases and then increases.In the spatial distribution,the patches tend to scatter first and then aggregate.The shape of the patches becomes more and more complex,gradually changing from an artificial form to a natural form.Continue to promote the restoration and construction of urban and rural green space has a positive effect on optimizing the landscape pattern of urban and rural green space.(3)With the change of development intensity,the landscape pattern index of urban and rural green space in Zhengzhou showed a gradation of "rural-urban-rural combined belt-urban area".In the rural and urban gradients,as the development intensity gradient increases,the number of green patches increases,the connectivity between patches decreases,the spatial distribution of patches becomes looser,and the shape of patches becomes more artificial when disturbed by human activities.,The increase in development intensity will aggravate the fragmentation of urban and rural green landscapes.The instability of the urban-rural area leads to the green landscape pattern not responding to the development intensity gradient.(4)Urban development intensity has a strong positive correlation with PD and SPLIT,and a strong negative correlation with COHESION,AI,and FRAC-AM.The areas with large positive and negative correlations are mainly in the urban-rural integration zone of Zhengzhou City and the mountainous hills in the west.As an important transition area of the city and the target area of urban expansion,the urbanrural integration zone has increased the intensity of development,leading to aggravation of the fragmentation of the green landscape;the western mountain and hilly areas have rich green resources,strong ecological sensitivity and great ecological value,and the development intensity is in the city area.The area is the lowest,and the green landscape pattern is generally better.(5)The problems facing Zhengzhou’s urban and rural green space landscape pattern are that the green space landscape of high-intensity development areas is severely fragmented;the spatial distribution of green space in low-intensity development areas is relatively independent;and the distribution of urban green space resources is uneven.By integrating small artificial green patches in high-intensity areas,constructing ecological corridors in low-intensity areas,and restoring important green patches in the eastern and southern parts of the city,the ecological security of the urban and rural green space landscape pattern is improved.