Health evaluation of urban ecological economic system in Mianyang city based on emergy analysis

doi:10.14088/j.cnki.issn0439-8114.2020.03.035

Abstract

Abstract: Based on emergy analysis theory, a health evaluation index for urban eco-economic systems is constructed. The emergy analysis method is used to uniformly measure the relationship between energy flow, material flow, currency flow, and population flow and perform quantitative analysis. From the perspective of time and space, the health status and changes of the urban eco-economic system in Mianyang city were evaluated, and then suggestions and countermeasures suitable for the sustainable development of the eco-economic system in Mianyang city were put forward. The results show that from 2009 to 2016, Mianyang city's economy developed rapidly and its comprehensive strength increased significantly. Both the emergy investment rate and the power emergy ratio have been increasing year by year, while the net emergy output rate has continued to decrease, with a year-on-year decrease of 40% in 2016. The environmental pressure in the system is constantly increasing, the environmental load rate has increased from 1.52 to 2.39, the EISD has decreased from 6.23 to 4.68, and the EUEHI has a trend of rising first, then decreasing and then rising. The sustainable development capacity of the system is gradually weakening, and the health capacity of Mianyang city shows an unstable state. In order to maintain the sustainable development ability and health index of Mianyang's eco-economic system, it is necessary to further optimize the industrial structure in the future, improve the utilization of energy value of the resources; vigorously develop high-tech industries, reduce environmental load; change the model of eco-economic development, and realize the harmonious development of urban health and ecological environment.

Key words: emergy, urban ecological economic system, sustainable development ability, health index, Mianyang city

CLC Number:

F062.2
F205

DENG Jin-shang, XIANG Xiao-yu, DING Peng-kai, SHAO Huai-yong. Health evaluation of urban ecological economic system in Mianyang city based on emergy analysis[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(3): 158-164.

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