The Environmental Quality Construction Of Resource-saving And Environment-friendly Field Agro-ecosystem

Field agro-ecosystem is material base for the subsistence and development of the mankind. Protecting and building the environmental quality of the field agro-ecosystem, implementing the strategy of sustainable development is the important embodiment of "people-oriented, coordinated and sustainable development, constructing the harmonious society".On the basis of analysis of environmental quality of field agro-ecosystem in Changsha, combined with the developing requirements of " two-oriented society ", choosing a series of related indicators about field ecological environmental quality, using the method of principal component analysis and cluster analysis to evaluate and analyze factors of natural resources, ecological environment and economical development, which is the influence of Changsha field eco-environmental quality, the paper studied the comprehensive score and determined rating about the quality of Changsha filed ecological environment, which is providing support for field ecological environment protection and planning.According to the regional diversity and the current situation of field, and combining the results of principal component analysis and cluster analysis, we divided Changsha into "two circles and two districts" by the principle of the same or similar field eco-environmental quality. The first circle in Changsha city includes five districts (Furong district, Tianxin district, Kaifu district, Yuhua district and Yuelu district); the second circle in Changsha city includes Wangcheng county and Changsha county; the east of the third circle includes Liuyang city, the west of the third circle includes Ningxiang county. The results show that the field eco-environment quality of the first circle is better; the field eco-environment quality of the second and third circle is poorer. The pressure on ecological environment of the third circle is the most serious. According to the different characteristics of each area of Changsha, construction countermeasures of field eco-environment quality in each area were provided.