Evaluation of Sustainable Development of Suzhou Urban Ecosystem Based on Emergy Analysis

Adopting the emergy analysis,in the paper various ecological flows of the ecosystem in Suzhou are analyzed.An index system for emergy evaluation of sustainable development of Suzhou ecosystem is establish,which is used to access the sustainable development degree and to predict the development of the emergy index.The results show that by 2007,the total emergy of Suzhou ecosystem reached 616.71×1021sej,the emergy self-sufficiency degree was 35.5% and environmental load ratio got 61.67.Compared with that in other countries and regions,it concludes that Suzhou city is a highly export-oriented eco-economic system,of which the development highly depends on the input from external resources.Facing the unstable world economic development and external environment,the system should increase the self-supply capacity and improve the stability;develop recycling economy and lower environment load ratio;strengthen the high-tech and talent investment to improve the potential sustainable development of the system.