Studies On Construction Of Urban Greening And Change Of Eco-environment In Beijing

Urbanization is the necessary trend of the development of human society and economy and is also the necessary stage that a country tends towards modernization. It brings the human society with great progress and substantial civilization as well as a series of severe environmental problems at the same time. However, urban forest and green land can improve and decrease the urban ecological and environmental problems brought by the urbanization. In this paper, on the basis of confirming the development stages of urbanization in Beijing after new China was founded in 1949, we analyzed the change of ecological environment and the build of urban greening in different urbanization stages in Beijing and probed into the relationship between progress of urbanization and change of ecological environment and the effect of urbanization on the change of ecological environment in Beijing. At the same time, we also researched the relationship between the construction of urban greening and the change of ecological environment and provided a scientific decision-making basis for Beijing to walk out a development way with good ecological environment and high quality urbanization and to realize the great target of building ecological city in Beijing.Entropy method and main element analyze were used synthetically to analyze the progress of urbanization in 1949-2005 in Beijing and the urbanization progress in Beijing has been divided into 4 stages by clustering analyzing method: urbanization progress is in low-speed developing stage in 1949~1985, faster-speed developing stage in 1986~1993, accelerated developing stage in the year 1994-2000 and developed stage after 2000. Clustering analyzing method was used to further analyze the urbanization development before 1985 in Beijing, namely low-speed developing stage, which can be divided into urbanization stage realized basically in 1949-1965, urbanization stage retrogressed in 1966-1974, urbanization stage renewed in 1975-1982 and earlier stage of urbanization development in 1983-1985. In the low-speed urbanization stage, proportion of average non-agricultural population in Beijing was 54.2%, average GDP was 6.965 billion RMB and average GDP per capita reached 849RMB, average Engle coefficient is 56.9% (1978-1985) and the residents just now reached to living standard with dressing warmly and eating their fill. However, as a result of the levity of the policy and system, there was no obvious changing rule in the development of urbanization. In the faster-speed urbanization stage, there was a fully rising in the development of urbanization in Beijing but with less increasing...