An Investigation Of Spatiotemporal Evolution Regularity Of Landuse Patterns Of Ecological Cities

Nowadays, under an unprecedented tide of urbanization in the world, China has experienced drastic changes of the urban landuse. With the continuous development of urbanization and economy, the evolution of landuse patterns in China is speeding up. Weather the pattern of urban landuse is rational or not will largely influence urban sustainable development, structure functioning and eco-environmental protection. Tianjin Binhai New Area and Shenzhen are two important poles of economic growth in China. The scale and patterns of landuse are changing dramatically with the economic development. Meanwhile, the two areas are devoting themselves to set up a new modern livable area, separately. Therefore, this dissertation took Tianjin Binhai New Area and Shenzhen as case study sites and investigated the regularities of their landuse change patterns in the basis of geography, urban planning and ecology using the methods of regional comparison, mathematical measure and landscape index. Some new developed software, such as Fragstats, ArcGIS, Photoshop, CAD and Excel, are used in this research to process, analyze and mapping data.The spatial-temporal changes of Landuse patterns were investigated from two perspectives:landscape classes and landscape metrics. First, the spatial-temporal distribution of landuse classes was analyzed by calculating the transition matrix that shows the relationships between move in or out of landuse classes. Meanwhile, three new landuse change measures, the degree of landuse gain, the degree of landuse loss and the degree of landuse variation were proposed in this study, which can more accurately convey the characteristics of evolution of changing landuse classes. Second, a new theory of regional subdivision was proposed to examine the spatial-temporal patterns of changing landscape metrics. The theory includes distributed measures and integrated measures of mathematical indicators to characterize landscape pattern evolution with time.Major conclusion from this research follows:(1) The general characteristics of landuse change pattern in Tianjin Binhai New Area shows a zonal pattern, while in Shenzhen it shows ring and branched forms of a combination of networks.(2) Coastal lines have profound influences on the landuse change patterns of the two sites; however in Tianjin Binhai New Area, the impact is more apparent.(3) Throughout the study period, the areas of forest/grasslands and wetlands with higher ecological functions were largely reduced, while the areas of urban land use with lower ecological functions were rapidly increased.(4) The degree of variation was a better measure than the degree of dynamic in accurate characterizing the dynamic changes of landuse patterns.(5) Between two urban centers, the spatial patterns of landuse changes show a gradient pattern: agricultural landscape-suburban landscape-urban landscape-suburban landscape-agricultural landscape.(6) Landscape metrics can be classified into two categories:sensitivity index and non-sensitive to the changes of landuse classes.