| Urban Forests are receiving more and more countries' recognition throughout the world. Based on the reviews of Urban Forest studies, this dissertation analyses developing process and construction status of Urban Forest. By summing-up construction experiences of Urban Forest both in China and at abroad and by putting forward the main existing problems, the author expounds systematically on developting trends, with stressed discusses on spatial potency for constructing and planning Urban Forest. The case study is in Yangzhou city. With the combined technique of 3S and measurements on the spot, in the method of qualifying and quantifying, the landscape patterns, structures and ecological functions of Urban Forest in Yangzhou City are systematically analyzed, and the existing problems are put forward as well. In this dissertation, the total developing indexes of Urban Forest are quantified, and the special-utilization status and potential space for Urban Forests in built-up area are studied. Based on the above studies, and with reference to the lately finished urban development planning and with respect to the environment background needs, the author accomplishes Urban Forest developing planning in Yangzhou city of its own characteristics. The study will provide good reference to Urban Forests developments of small and medium cities in economically well-developed regions of China. The main results are as follows:1. Urban Forests development is a dynamic and opening process. It is influenced by urban environment and outer landscape patterns. Urban Forests have typical scale characteristics. On the macro region scale, Urban Forests are one of the most important elements and significant contents of Chinese forest Eco-network system. On the landscape scale, Urban Forests are the vital and basic establishment of city, and guarantee of urban environment sustainable development. Meantime, the buildup of Urban Forests as trees as main body, relying on nature landscape, can not only improve urban ecological environment, but also stand out city features, with urban landscape inline.History of Urban Forests development in our country is about fifteen years. There have being appeared some problems during the development course. But two important questions are to be solved urgently to assure a healthy and sustainable development of Urban Forest in China.(1) Simultaneous development of Urban Forest ecological planning and urban construction. In order to solve the negative affect caused by urban development, Urban Forests are required to be allocated scientifically on macro-scale and reserves enough expandable space ahead of schedule. In the article, the author summarizes existing problems and countermeasures in Urban Forests planning. Based on the reviews of Urban Forest area control, the dissertation establishes indicator system, dominated by Urban Forests structural indexes, adaptive to multi-aims evaluation of landscape patterns, planning control and development process in different stages for sustainable development of Urban Forest in our country.(2) Exploring the potential space and improving the space utilization for the best Urban Forest functions and benefits. The shortage of urban greening land use has restricted Urban Forest development. How to take full advantage of Urban Forest space is the most important question. The ultimate way out is to build the high quality Urban Forest through scientific layouts and well protection of trees in good growth condition.3. With ETM image as data resources, combined with GIS and analysis of landscape pattern in Yangzhou city, the dissertation studied the land use pattern, forest landscape attributes. The result indicates that the overall development of landscape is out of balance. A few huge patches such as paddy field, city and county patches and water area mainly occupy the whole region. Other landscape types have little proportion in area but poor in linkage and high in fragmentation. The total forest resources in Yangzhou city are deficient and imbalanced. 78.5 percent of Woods con...
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