能值理论在我国北方刺参（Apostichopus japonicus）养殖池塘的环境可持续性分析中的应用

The economic income and environmental sustainability of sea cucumber (Apostichopus japonicus) culture in northern China was analyzed using the emergy approach. Schematic diagram of sea cucumber ponds with emergy symbols was built to analyze the emergy of different parts in sea cucumber earthen ponds. Emergy yield ratio (EYR), emergy loading ratio (ELR) and emergy sustainable index (ESI) were selected to evaluate the sustainability and carrying capacity of sea cucumber ponds and several integrated fish and shrimp culture model. The results showed that the EYR in sea cucumber culture was higher than that in integrated fish and shrimp culture, and sea cucumber culture gained higher sustainability and carrying capacity.