Research On Forestry Development Based On The Urban Ecology Environment Construction

As the human settlement, cities are the fruits born from the progress of technology, economy and social civilization. They have experienced great changes in thousands of years, and developed into the modernized metropolis today. With the development of city, the human civilization advances by leaps and bounds. However, it is because of the high-speed development of the city and mankind's excessive exploitation of the natural resources which lead to some serious environmental problems, especially the urban ecology environment has presented the serious crisis.Forestry is the subject of ecology and environment construction. To do well in forestry construction plays a great role in the protection and improvement of the ecology environment. This thesis regards the improvement of the urban ecology environment as the goal. Regarding the city as an ecosystem, it also studies the position of forestry in the urban ecology environment construction and how to fully play the dynamic role of forestry with a brand-new angle. This thesis has probed into the best environmental quality, which are essential and necessary for the survival of urban human. It expounds and analyzes the characteristic of urban ecosystem systematically, and announces the ecology essence causing the crisis of urban ecology environment. It uses ecology principles, urban ecology theory, urbanization theory, modern forestry's theory and urban sustainable development theory to study the function of the forestry on solving these problems in urban ecology environment construction.The thesis analyzes and studies the subjective status and significant function of forest in urban ecology and environment construction systematically, as well as forms on overall frame of forestry development. It puts forward the guideline, development strategies and development models of forestry in urban ecology environment construction, "introducing city forest, and making city located in forest ". It points out that city forestry construction just plays its important role as city forests by constructing a continuous and effective forest ecology system, playing the important role of the city forests comprehensively, these are indispensable factors in city ecologyenvironment construction.And through carrying on positive analysis of three different kinds of big cities in Shanghai, Dalian and Harbin, we analyze and discuss the scores and common problems in the ecology environment construction of the three cities. The analysis will help us find some common problems which call for urgent measures on forestry development during the process of city ecology environment construction, therefore, to point out the six aspects of research and practice which we should pay more attention to in city ecology environment construction and development. In this dissertation, it also makes qualitative and quantitative evaluation on the three major benefits (ecology, economic and social ones) of forestry in the urban ecology environment construction. It firstly uses the theory of "the relative substitutions of equivalent benefit" to calculate the economic profits and values of emitting oxygen and absorbing carbon dioxide in city forests. And also it stresses the ecology environment benefit of forestry to make the three major benefits unite and function comprehensively in the construction. On the problems that exist in the urban ecology environment construction at present, it has put forward measures and suggestions to give play to the subject function of forestry with feasibility and offered the feasible theoretical direction and decision basis for improving the urban ecology environment construction. In the expect that the city will become a modernized one, which accords with the law of ecology economics and the requirements of sustainable development strategy, with reasonable structure, highly-effective function and harmonious relation, and also a city of ecological civilization, material progress and spiritual civilization.