Spatial And Temporal Differentiation Characteristics And Driving Force Analysis Of Multi-scale Landscape Pattern Of Urban Agglomeration In Central Yunnan

Landscape pattern is a direct reflection of human activities and economic development in a certain social form.The formation of a land-use landscape pattern is closely linked to the stage of social development.The formation of landscape pattern is usually the result of natural factors and human factors.Under the combined effect of natural,human,socioeconomic,and national policy changes,the land use structure and the quality of land resources are constantly changing,thereby affecting the regional ecological environment.The urban area of central Yunnan belongs to plateau and mountainous areas,with complicated terrain and fragile ecological environment,and obvious multi-scale characteristics of land use.It is the region with the most active economy and the most drastic changes in land use in Yunnan.The reasons and their driving forces of change have practical application value,and will be of great significance to promote the coordinated and coordinated development of the regional economy,optimize the allocation and scientific use of land and resources,and improve the ecological environment.And optimized configuration provides scientific reference.Based on a review of related researches on land use,landscape pattern and its driving forces at home and abroad,this paper summarizes the existing research and combines the characteristics of the research area with the research content and technical route.The data used are the land use classification data of the central Yunnan urban agglomeration and the four municipalities in 2009 and 2015(1: 10,000).The 2009 land use data is derived from the second national land survey data of Yunnan Province,and the 2015 land use data.Data from annual changes in the second land-use survey.GIS technology,Fragstats 4.2 and other software tools were used to analyze the spatial-temporal differentiation characteristics of the landscape pattern at the urban agglomeration scale and the city scale at mid-Yunnan during the period of 2009-2015,and factor analysis and grey correlation analysis were used to study the driving forces affecting the change.The results show:(1)In terms of land use change,at the urban agglomeration scale,the land use landscape change rate is 0.903%.The main landscape types in the urban agglomeration are cultivated land and woodland landscape.During the study period,the area of cultivated land,forest land,garden land,and other land types decreased.;Grassland,construction land,water area landscape area increased;At the municipal scale,the land use landscape area change rate in Kunming was 2.62%.During the study period,the area of cultivated land,forest land,grassland,garden land,waters,and other land types decreased,and the land area of construction land increased;the land use landscape of Yuxi City increased.The area change rate was 1.06%.During the study period,the area of cultivated land,garden land,waters,and other land types decreased;the area of construction land and forest land increased;there was no significant change in the area of grassland landscape;the area change rate of land use landscape in Qujing City was0.53% During the study period,the landscape area of cultivated land and forest land decreased;the area of grassland,construction land,garden land,water area,and other land types increased;the change rate of land use landscape area in Chuxiong Prefecture was 0.47%.During the study period,the forest land,garden land,water area,The landscape area of other land types decreased;the grassland landscape area did not change significantly during the study period;the cultivated land and construction land landscape area increased;On the scale of the urban agglomeration,the connectivity of the dominant landscapes in the study area is reduced,the degree of landscape heterogeneity and fragmentation is increased,the degree of landscape patch aggregation is reduced,and land use is moving towards uniformity and diversity;at the city scale Above,the diversity index and uniformity index of Yuxi City,Qujing City,and Chuxiong Yi Autonomous Prefecture increased,the spread index gradually decreased,and the maximum plaque index and aggregation degree index of Chuxiong Yi Autonomous Prefecture,Qujing City,and Kunming City all decreased.Landscape heterogeneity in the southwest,east,and west of the entire study area increased,land use was even and diverse,and the dominant landscape's control of the landscape pattern weakened;fragmentation in the west,east,and central areas increased,connectivity became weaker,and artificial The activities have a significant impact on the landscape pattern change in the region.(3)The driving force analysis of the multi-scale landscape pattern change of the urban agglomerations in central Yunnan is divided into quantitative and qualitative analysis.The quantitative analysis results using factor analysis and gray correlation analysis methods show that: The improvement of the economic level of the urban agglomerations is the most important driving factor affecting the landscape pattern changes in the urban agglomerations of central Yunnan.At the same time,the impact of policy factors such as the western development,bridgehead strategy,and farmland protection system on the landscape pattern of central Yunnan urban agglomerations is also critical.Development strategies such as urban planning,as the spatialization of the government 's will,affect urban agglomerations and states The positioning and development of the city have formed different changes in the multi-scale landscape pattern of the urban agglomeration in central Yunnan.