Analysis on Sustainability of Agricultural Eco-economic System based on Emergy Theory in Naiman Banner
基于能值理论的奈曼旗农业生态经济系统可持续性分析

The sustainability of agricultural eco-economic system in Naiman banner was evaluated with emergy analysis based on emergy theory.A paradigm(2004) about energy flows of the agricultural eco-economic system in Naiman banner was presented,together with the main energy flows and energy analysis indices of the system in the period of 2000 to 2004.The energy input ratio of non-renewable resources was 26.11%,which was the greatest potential danger to the sustainability of agriculture in Naiman banner,and that of non-renewable purchases was 35.78%.The 72.52% of the total energy output was from stockbreeding in 2004.The agriculture development level and the standard of farmers' living were lower than those of China in 2000.The sustainability of the system studied,however,was better than most areas of China studied.Furthermore,with a high net energy yield ratio,agriculture of Naiman banner had advantage in encouraging investment.From 2000 to 2004,the energy input ratio of non-renewable purchases kept increasing year by year,along with a total energy output increase of 78%,to which the stockbreeding made the greatest contribution.Meanwhile,the increasing environment load ratio and the dropping energy-based sustainability index showed a sustainability decrease of agricultural eco-economic system in Naiman banner.