Emergy Analysis of Agricultural Ecosystem in Chizhou of Anhui

This paper applies emergy theory and analysis method to calculate the emergy input,output and emergy index from 2010 to 2015 in order to study the development characteristics and trends of the late six years in Chizhou. The results show that:(1) Total emergy input increase year by year, and the industrial auxiliary emergy is increased by 1.94 percent and it has the highest average annual growth rate; (2) In the study interval, the output rate of net emergy is increased by 0.38, emergy yield ratio shows an increasing trend, agricultural economic growth is stable; (3) The value of free emergy is 0.44, environmental loading ratio is high, the development of Chizhou agricultural is putting pressure on the environment; (4) In 2015, the sustainable development index of agricultural ecosystem in Chizhou was 0.93, showing a slow upward trend compared with 2010 and the overall level of agricultural development is low, but the ability of sustainable development becomes more and more strong.