Studies on emergy indices for evaluating system sustainable development property.

A new emergy index of sustainable development(EISD) for evaluating system sustainable development property is suggested to simplify and merge the current emergy evaluation indices system of international emergy analyis theory. Using the new EISD, a case study is made to compare three different dike-pond modes in Pearl Delta. The result shows that EISD considering both the environmental impact and economic benefit, can evaluate better the system sustainable development property difference and its cause of formation, i.e. the different contribution of different production structure to social economic development under equal environmental impact.