Study On The Construction Theory And Comprehensive Assessment Of Urban Forests

Referring to the achievement and the practical experience of the research of the urban forest, the concept and the definition of the urban forest has been put forward, and this work is also based on the consideration of the present situation and the trend of the urban forest and the ecological landscape architecture, in accordance with the basic principle and concept of the ecology. And from the above, the subject of Urban Forest is defined and its research domain has been formed. And after the work, with the reference of the materials of the area division of the forest of china, according to the conditions of weather ,the area of usable land, the present situation of the greenery work of the cities, the conditions of economy and society, the urban forest area can be divided by the method of the method of cluster classification. According to the conditions mentioned above, the advantages and disadvantages for the development of the urban forest has been defined, and the way of constructing pattern under the present situation has been found and made clear.At the same time, summarizing the achievement of the study on the present structure and benefits of urban forest, the comprehensive index system for the assessment of forest in modern city is built, including the factors of ecology, structure and landscape etc. The grades of standard, procedures and methods of the assessment of urban forest are built, providing the scientific methods for the assessment of urban forests.In this way, the quantified index can be given for the plan of the urban forest in our country, and it also can be used to make an overall control for the plan of the urban forest. And it can also be used to select the best plan from many types of plans, to adapt the assessment for the present situation, plans and the achievements of construction of urban forest. The urban forest in Baotou under the natural and urban environment has been investigated by using the investigation method that is used by the Forestry Bureau of the U.S. to investigate the structure of urban forest. The present situation of the coverage and distributions of forest in different areas has been analyzed by using theinformation obtained from the remote control, map and the statistic materials from related special divisions 。Based on the former work, the number and distributions of the bench marks have been defined by using the principle of random selection. After this work, the data needed will be measured according to those bench marks.In this way, the distributions of patterns and the characters of structure such as the composition of the tree species, the structure and dynamic of plants communities, the structure of layers, the distribution in the space can be defined. On the basis of the analyses of the ecological functions and the landscape results of urban forest in Baotou, the differences of the benefits in ecology and landscape made by different communities has been compared. After making a comprehensive assessment, the system of urban forest with multifunction can be built.According to the characters of Baotou (its natural conditions, the species of plants, the cultural geography , the historical and cultural background, the type of the city, the economic situation , and its present situations of development).especially the temperature and water conditions which are the critical factors for the developments of the urban forest, the construction pattern of the different kinds of urban forest and plants community has been put forward, the existing problems, suitable conditions, the range of its using, the action of its pattern, the direction of its developments and the methods of its solving, have been analyzed, at last ,the plan, the procedure, direction of the development of the urban forest in Bautou is also posed.