ASSESSMENT OF SUSTAINABILITY IN ECO-ECONOMIC SYSTEM IN SICHUAN PROVINCE BASED ON EMERGY ANALYSIS

Based on emergy analysis,a quantitative and comparative research was carried out by comparing different counties and districts in Sichuan Province in China with selective indices.The curve of sustainable index fluctuated from 3.35 to 1.97,with a trend similar to the change of population carrying capacity and emergy to dollar ratio,indicating that under the pressure of population and resources,the development in Sichuan Province was in a less-developed phase on the basis of native resources.From 1998 to 2003,the emergy investment ratio and net emergy yield ratio showed a reversed trend,revealing the decrease in the use efficiency of resources and economic competitive power,but the increase in environment and resource utilization,emergy density and economic activity.The steady increasing trend in total emergy per capita and the adagio increasing trend of fraction of emergy used from electricity demonstrated the improvement of people's life.However,there is still a greater gap in the utilization of resources,when compared with developed districts.