Emergy based ecological economic dynamics of Shunde agriculture system

Based on emergy theory and method combining with environment economic methods, the ecological economic dynamics of Shunde agriculture system from 1978 to 2000 was synthesized from two aspects of natural donor and human utility value. A new calculation method was presented to deal with emergy balance between input and output, and accordingly two new emergy indices, named Local Effect Ratio (LER) and Emergy Benefit Ratio (EBR) were put forward. The results show that although Shunde agriculture system has higher productivity compared with general productivity of the world, its assessed output through export with emergy exchange ratio lower than 1. Further dealing processes for pork and fish were suggested to set up. Emergy synthesis get almost the same evaluation results with environmental economic evaluation, and has high potential to combining with environmental ecomoic evaluation methods, but there is still something that should be done on indices selection and output branches.