Study On The Characteristics And Optimization Strategies Of Landscape Pattern Evolution In Downtown Area Of Jixi City

Resource-based city is a type of city with special functional significance,which is subject to the dual constraints of the fragility of the ecological environment and the particularity of resource distribution.Jixi City in Heilongjiang Province,as a typical mining city,takes the exploitation and utilization of coal resources as a powerful driving force for urban economic development,and a series of regional ecological issues arising cannot be underestimated.Based on the perspective of landscape ecology,this article takes the downtown area of Jixi City as the research object,and uses the remote sensing images of 1993,2003 and 2015 as data sources to interpret and obtain the land use changes.This article analyzes the characteristics and driving factors of landscape pattern changes during its development,and uses overlay analysis and correlation analysis to explore the relationship between landscape pattern changes and heat island effects.Finally,the strategy of landscape pattern optimization and ecological restoration was put forward.The thesis achieved the following main results:(1)In the past 20 years,the landscape pattern in the downtown area Jixi City has changed significantly.From 1993 to 2015,the landscape type of downtown area in Jixi City developed in an aggregate manner.Natural landscape types were gradually occupied by artificial landscape types.Human activities have cumulatively increased the ecological impact of the downtown area of Jixi City.(2)The human factor is the main driving force for the landscape pattern evolution of the downtown area of Jixi City,and the natural factor is the reason for the formation of the pattern.With the economic development and population growth,the area of artificial plaques,mainly for construction land and mine land,has increased significantly.Mining,processing and transportation have an endogenous effect on the urban spatial structure,which has formed a typical industrial and mining urban spatial layout in Jixi City.(3)The ecological effect of the landscape pattern evolution is significant,mine land have a strong heat island effect.There is a large difference in surface temperature between different types of land use.The vegetation coverage in the study area has a significant negative correlation with surface temperature.The average temperature,maximum temperature,and relative temperature index of mine land are significantly positively related to patch area.(4)The landscape type arrangement,ecological restoration zoning,and ecological corridor construction are the three main strategies for the landscape ecological pattern optimization.The optimization of landscape pattern mainly focuses on the division,integration and coordination area ratio of artificial landscape types;the ecological restoration mainly focuses on ecological restoration zoning and ecological corridor construction.