Study On The Evolution And Optimization Strategy Of Landscape Pattern In Jinan Section Of The Yellow River

With the proposal of ecological protection and high-quality development strategy in the Yellow River Basin,Jinan,as the central city of the Yellow River Basin,has put ecological construction on the fast lane,and the land use pattern along the Yellow River has undergone major changes.Landscape pattern will change accordingly,and this change will inevitably have a certain impact on social economy and ecology Therefore,how to scientifically and rationally plan the development of urban landscape elements and deal with the development and adjustment of land use along the Yellow River in Jinan is urgent In order to provide a reference for the sustainable development of society,economy and ecology,this thesis studies the spatial and temporal evolution and driving analysis of the landscape pattern in Jinan section of the Yellow River Based on the remote sensing interpretation data,the landscape indices of the five-year landscape pattern classification map are obtained,which reflect the landscape index,landscape type change characteristics,landscape type transfer matrix and comprehensive dynamic attitude of land use in space.Finally,the driving factors causing the evolution of landscape pattern in the study area in the past 20 years are analyzed.On this basis,the study proposes an optimization strategy and the main conclusions are as follows:(1)During 2000-2020,the landscape pattern changed significantly in the study area.The spatial change of landscape pattern was different in different periods.The whole landscape pattern showed that cultivated land was the main body,construction land was concentrated and distributed,water body,forest land and grassland were scattered along the banks of the Yellow River The landscape connectivity of green space along the Yellow River is weakening,and the landscape spread degree of construction land is increasing,and the degree of landscape fragmentation is increasing in the first 10 years and then it is obviously reduced in the next 10 years The spatial distribution of landscape index and the number of landscape patches during the study period effectively revealed that the growth pattern of cities along the Yellow River was a changing process from diffusion to aggregation and accompanied by the generation of new patches.(2)Using land use transfer matrix to analyze the law of the transformation between landscape elements.On the whole,the land use development of Jinan section of the Yellow River mainly presents two stages: the first stage is that the overall land use speed in the study area is accelerated during the period of rapid construction from 2000 to 2010,and a large number of cultivated land is transferred out for construction land,resulting in the disconnection between development and green space ecological protection;The second stage is from 2010 to 2020,with the implementation of ecological protection projects,the cultivated land area has increased slightly,and the grassland and woodland have increased by 0.79%,indicating that the ecological environment has begun to develop well.(3)According to the dynamic attitude of comprehensive land use in each district and county,the driving factors selected from the natural and social perspectives by geographical detectors are analyzed by factor detection and interactive detection.The results show that in factor detection,elevation,average annual temperature and average annual rainfall are the dominant factors in natural factors,and tertiary industry plays a leading role in social factors.On the whole,the significance of natural factors is higher than that of social factors;In factor interaction detection,the driving effect of each driving factor on land use pattern evolution has nonlinear enhancement and double-factor enhancement effect,and the interaction effect of each driving factor in the first 10 years is more obvious than that in the next 10 yearsFinally,it is found that there are some problems in Jinan section of the Yellow River in recent 20 years,such as insufficient landscape connectivity along the Yellow River,unbalanced land use and development along the Yellow River,too broken landscape pattern,etc.Then,the landscape pattern optimization strategies are put forward from three aspects of landscape element system optimization and landscape ecological spatial structure optimization and strengthen of ecological core areas,in order to provide reference for the sustainable development of urban landscape ecology in the region.