Landscape Pattern Evolution Of Sea-island Urban Green Space

Urban green space is not only the green infrastructure of a city,but also an important life support system of a city,which usually has ecological,social and economic benefits.Under the guidance of landscape ecology theory,it is an important way and means to study urban landscape pattern by using remote sensing technology,geographic information system technology and green space landscape pattern.At present,scholars at home and abroad mainly focus on the analysis of the overall urban green space landscape,and there are still few reports on the analysis of the urban green space landscape pattern.In the 21 st century,the island is becoming more and more prominent.Xiamen,which won the title of "national ecological garden city" in January 2020,has a good ecological and natural endowment,and Xiamen island is a typical island city.Since the rapid urbanization in the 1980 s,great changes have taken place in the island's green landscape.Based on the interpretation of remote sensing images of Xiamen island in 2000,2009 and 2018,this study analyzes the dynamic changes and landscape pattern evolution of urban green space,discusses the landscape pattern evolution characteristics of sea-island urban green space in the past 18 years,and analyzes the reasons for the changes,so as to provide Suggestions for the development of sea-island cities.The research results are as follows:? In this study,land use of Xiamen island is divided into five categories: green space,construction land,unused land,water body and farmland,and the green space is subdivided into four types: regional green space,protective green space,attached green space and park green space.From 2000 to 2018,great changes took place in the landscape of Xiamen island,showing a trend of radiation from the central city to the surrounding areas,especially from siming district to huli district.Construction land occupies the main landscape advantage,followed by green space.Green space distribution is uneven,siming district ecological quality due to the lake area.From 2000 to 2009,land reclamation in Xiamen island was obvious.The reclamation area was mainly unused land,farmland completely disappeared,farmland was mainly turned into unused land,and protective green space and attached green space increased significantly,while regional green space decreased significantly.From 2009 to 2018,a large amount of unused land and green land in Xiamen island were converted into construction land,with remarkable urbanization.?From 2000 to 2018,Xiamen island urban green space landscape pattern evolution characteristics and reasons:(1)Mountain and hilly forest landscape constitute the main pattern of urban green space.The park green space occupies the main advantage of the green space space,with a small increase in area,the smallest degree of fragmentation,high degree of dominance,the highest degree of landscape connection and the most complex shape.(2)Urbanization catalyzes the reconstruction of urban green space.The urbanization process promotes the continuous intensification of urban expansion,and the conversion of green space types in different cities intensifies.The scale of green space increases and decreases greatly and the structure changes drastically.The attached green space and protective green space expand and fill,and the corresponding regional green space shrinks rapidly.Due to the invasion and segmentation of construction land,the number of patches in urban green land increased.From 2000 to 2009,the number of patches increased from 2,238 to 7,363,and the fragmentation degree of green land patches was greatly enhanced,while the physical connectivity between patches was weakened.From 2009 to 2018,the urbanization was remarkable.A large number of green land was converted into construction land,which was reduced to 2,959 pieces,with the degree of fragmentation significantly reduced and the physical connection between patches enhanced.The patches of auxiliary green space and protective green space are small,and the degree of fragmentation is large.(3)Xiamen to create a national ecological garden city and other policies to significantly regulate the development of urban construction.The green area continued to increase,increasing by 5,024.54 hm from 3,642.04 hm to nearly 40%,and the landscape diversity and evenness increased.The attached green space and protected green space increase most obviously,the landscape connection degree and superiority degree show an increasing trend,while the regional green space shows a decreasing trend.(4)The trend of urban green space from "automatism" to "be constitution" is significant,and the degree of interference from human activities is greater.From 2000 to 2018,the weighted average shape index of green space decreased from 7.43 to 5.2,and the landscape shape tended to be regular and simplified,among which the transformation of park green space was the most prominent,while the shapes of ancillary green space,protective green space and regional green space remained relatively simple.(5)The related factors mainly include natural ecology,economy,policy and population.? Reference significance for the construction and development of sea-island city:(1)The green space system construction should follow the principle of ecology and network,to realize the harmony between man and nature.(2)Strengthen the advantages of green development,the construction of ecological civilization.(3)The government should formulate and implement the guidelines,policies and corresponding action plans for the comprehensive management of coastal zones and Marine environmental protection that are compatible with the construction of sea-island cities,strictly control land reclamation and make scientific arrangements for reclamation projects.