Landscape Pattern Optimization Of Changsha Zhuzhou Xiangtan Urban Agglomeration Based On System Dynamics

In the past decade,with the continuous promotion of the integration policy of Changsha Zhuzhou Xiangtan Urban Agglomeration,the economy of the region has developed rapidly.At the same time,the landscape pattern and ecological environment of the region have also changed dramatically.This paper takes the landscape pattern of Changzhutan urban agglomeration as the research object,and uses Landsat remote sensing images in 2004,2011 and 2018 as the basic data.The images are interpreted using multi-scale segmentation and classification.The landscape pattern index method is adopted after the interpretation results are revised.Analyze the interpretation results of the revised image of the Changzhutan Urban Agglomeration,and analyze the dynamic changes of the landscape pattern,and then build a system dynamics simulation model of the dynamic changes of the landscape pattern,predict the change trend of the number of landscape types in 2025,and analyze the research in four development scenarios.The composition plan of the landscape quantity structure in the district,the optimal combination plan of the number of landscape types that suits the development status of the changzhutan urban agglomeration,is a quantitative constraint plan for the optimization of the landscape pattern of the changzhutan urban agglomeration,and will be used as a reference standard for the transformation of the landscape type and got the following conclusions:(1)According to the classification results,from 2004 to 2018,construction land is the only landscape type with increased area,while the other six landscape types have decreased(2)From 2004 to 2018,the landscape pattern change of each landscape type is as follows:the degree of fragmentation of woodland patches first decreases and then increases,the landscape pattern first tends to be integrated and then to fragmentation,and the stability is strong.Heterogeneity of spatial distribution of types has increased;the degree of fragmentation of garden landscape patterns has first increased and then decreased,the complexity has increased,and the heterogeneity of spatial distribution has decreased;the degree of fragmentation of cultivated land landscape patterns has continued to decrease and tend to be integrated,benefiting from land improvement The implementation of the policy improves the intensive use of cultivated land;the degree of fragmentation of grassland landscape increases first and then decreases,the complexity of the shape decreases,and the heterogeneity of landscape distribution continues to increase;the degree of fragmentation of water landscape increases first and then decreases,and the water cycle function decreases first and then increases The irregular shape and complexity of the patches in the water area are enhanced;more intensive patches are formed on the construction land,and the large-scale patches are formed,and the landscape pattern is developing in an integrated direction.(3)The overall characteristics of the change in the landscape pattern of the changzhutan urban agglomeration are as follows:from 2004 to 2018,the degree of landscape patch aggregation in the region first decreased and then increased,and the degree of landscape fragmentation increased first and then decreased;The landscape diversity first strengthens and then weakens;the landscape spatial distribution heterogeneity shows a trend of weakening and then strengthening;the landscape shape tends to be complex,and the shape complexity and irregularity of landscape patches tend to increase.(4)The system dynamic model is used to predict the area type of Changzhutan urban agglomeration in 2025,and four development scenarios are set(traditional inertia development scenario,land planning development scenario,ecological priority development scenario and coordinated development scenario).After comprehensive comparison and analysis,the plan four coordinated development scenarios are selected as the optimal plan and long-term combination of landscape type area of Changzhutan urban agglomeration.Zhutan urban agglomeration is one of the quantitative constraints for landscape pattern optimization.It will be used as a reference standard for landscape type transformation,and will promote the Changzhutan urban agglomeration to embark on a sustainable and coordinated development path.