Energy Flow Analysis and Evaluation of a BiogasFermentation Agroecosystem

摘要

Energy analysis and evaluation of a biogas fermentation linked agroecosystem wereconducted applying the method of systematic analysis. The input and output energy of threesubsystems within the ecosystem were calculated and analyzed respectively. The results of theexperiment showed: the total output / input energy ratio of the whole ecosystem is 0.454, which hasgreat potentiality for improvement. The output/input energy ratios of breeding subsystem, biogasdigester subsystem, and planting subsystem are respectively 0.788, 0.405 and 0.168, which meansbreeding subsystem is running at a benign state, biogas digester subsystem is at a medium levelstate and planting subsystem is at a low level state. Based on studies, regulating measurements forsustainable development with sound economic, social and ecological benefits of the ecosystem areput forward.