吉林省玉米田生态系统能流特征分析

his paper uses the ecological energy method to analyze the energy flow in the corn field ecosystem in Jilin province. It shows that the Circle Ratio of Energy Flow (CREF) of the corn field ecosystem in Jilin is 0.4910, which is lower than mean level of the whole country. On the surface ,the self-given capability is poor. The level of mechanization in Jilin is high, so its inorganic energy input is much higher than other places. This is the main cause of the low CREF. The energy back to field of organic fertilizer and stalk accounts for 44.48% of the human supplemental energy input. It is good to reduce the environmental pollution and the usage of energy from the outside of system. This fulfills the concepts in circular economy. The agricultural machine energy input takes 43% of total energy input. The ratio of energy output to input is 4.21, and the energy surplus is very large.