Analysis of Emergy and Sustainable Development on the Eco-economic System of Guilin

Using the emergy theory, the eco-economic system of Guilin is analyzed, which has related to about 9 indexes such as net emergy yield ratio (EYR), emdollar value (Em($)), emergy investment ratio (EIR). Finally,drawin g some conclusions as follows:(1)The net emergy yield ratio (ELR) of Guilin has rosen from 5.748 in 2003 to 6.749 in 2008, which indicates the net benefits of eco-economic system in Guilin has improved, and the production efficiency has enhanced. (2)The trend of environment loading ratio (ELR) of Guilin has ascended, which suggests the environmental pressure has increased. (3)The emergy index for sustainable development (EISD) of Guilin has fallen from 2.710 in 2003 to 0.865 in 2008, suggesting that the ability of sustainable development has quickly diminished.