| At present,Chinese cities are in the stage of rapid urbanization,with rapid socio-economic growth,rapid urban population agglomeration,and unpredictable spread of urban construction land,which has brought urban diseas such as traffic congestion,environmental damage,and sharp decline in arable land.The delineation of the urban spatial growth boundary achieves a reasonable expansion of the city and also protects the ecological pattern around the city.Scientific prediction and delineation of urban spatial growth boundaries has become an important part of urban planning and decision-making.The main research content:(1)Analysis on the Temporal and Spatial Evolution of Construction Land in Downtown Kunming.The study selected four remote sensing image maps in the urban area of kunming in 1990,2000,2010 and 2017 as the basis for the study.Through ENVI interpretation of the change of construction land in the four-phase image,The quadrant analysis was used to analyze the spatio-temporal characteristics of construction land expansion in each quadrant.,Combining the changes of landscape patterns of construction land in the four periods,analyzing the layout features of construction land,and determining the main factors affecting the spatial pattern of urban space in Kunming.(2)Delimitation of Urban Spatial Growth Boundary Based on Land Ecological Suitability Evaluation.Based on the analytic hierarchy process and land ecological suitability evaluation,the evaluation map of land ecological suitability was obtained,the expansion time sequence of construction land in central urban area of Kunming was determined,the rigid growth boundary of urban space was defined,and the elastic growth boundary of 2020 was demarcated according to the Kunming master plan.(3)Demarcation of urban spatial growth boundary versus total regulatory space control and status quo construction land use.Study and delineate the comparison between urban spatial growth boundary and total regulatory space control,identify boundary differences,and emphasize the protection of the basic ecological safety of the city;compare the current construction land with the delimitation of urban spatial growth boundary,and propose the future urban spatial growth and land use layout And the status quo of construction land adjustment proposals,summarizes and proposes strategies related to urban space growth.The main conclusions of the research are as follows:(1)The spatial pattern of urban space in Kunming has changed from the expansion of the single-center circle structure to the expansion of the multi-center cluster structure.The urban space has expanded northeast to the Airport New Area and southeastward to Chenggong Area.The main factors influencing urban space expansion include natural geographical environment,socio-economic and population,policy and industrial layout,urban function positioning,and transportation factors.(2)The index analysis of the landscape pattern of construction land clearly shows that the construction of the main urban area in the center of Kunming has achieved new growth through the transformation of the old city.The construction of the Chenggong New Area and the Airport New Area gradually formed scale,but there was no intensive development.(3)From the perspective of ecological background protection,the study defined the urban urban space rigid growth boundary range of 782.45 km~2 in Kunming downtown by integrating the evaluation of land ecological suitability with the current status of land cover.According to the Urban Master Plan,an elastic boundary of 430 km~2 was determined.(4)The demarcation of the space growth boundary and the total regulation space control,emphasize the protection of the natural ecological environment around the city.Border space growth compared with present situation of construction land,determine the future of land used for urban construction biggest growth margin of 355.21 square kilometers,in view of the construction land beyond the border land layout adjustment Suggestions are given. |
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