Study On Evolution And Regionalization Of Agricultural Eco-economic System Of China Based On The Theory Of Emergy

Emergy created by H.T.Odum is a quantitative analysis method to evaluate natural ecological system and eco-economic system. It provide the new measure for analysis relation environment, resource between ceonomic activity. Emergy is defined as the energy of one type required in transfomations to generate a flow or storage. Solar emergy of a flow or storage is the solar energy required to generate a flow or storage. Its units are solar emjoules(abbreviated sej). An mergy analysis of China agricultural eco-economic systems has performed in order to study its sustainability .This paper constructs the typical index of agricultural eco-economy system, carries out a quantitative analysis on the evolution over 25 years and regionalizatio of Chinese agricultural eco-economy system.The research indicates that the emergy investment structure of Chinese agricultural eco-economy system is quite irrational; the systematic productivity is going downwards; the agricultural pollution is severe and the pressure of agriculture production environment is also increasing; the index of systematic stability and sustainable development is on a downtrend; but the agricultural modernization is gradually enhanced. The research points out that the Chinese agriculture is in the form of mixture agriculture, which is going through the transition period from autarky to market agriculture, from traditional to petroleum agriculture, from mixed to modernized agriculture, which is evolving to high pollution and consumption, low stability and sustainable. In view of present situation of Chinese agriculture, according to the theory of sustainable development ,the paper propose some suggetions.This paper analysis regional difference of Chinese agricultural eco-economy system, applied the method of k-mean cluster and based on the theory of emergy. The research indicates that the regional difference is obvious, and the characteristic of zonality distributed is certainale. Using constellation clustering method, 31 provincial-level units ultimately are regionalized into 9 agricultural development areas, and 15 agricultural development sub-areas, established the regionalization system of china agricultural eco-economic. Then introduced ArcGIS9.2 to couple graphics-base and displayed dimensional distribution. This paper uses the local difference analysis result and the natural environment factor, summarized the characteristic and the agricultural development restriction factor of 15 agricultural development sub-areas, then propose some suggetions of sustainable development.Then some problems are found in the reseach and undicate the direction of the future research in this paper.