JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (11): 1886-1896.doi: 10.31497/zrzyxb.20171137

• Resource Ecology • Previous Articles     Next Articles

Dynamics of Urban Food Metabolism with Water-Carbon Footprint Respond: A Case Study of Beijing

XIONG Xin1, ZHANG Li-xiao1, ZHANG Peng-peng1, HAO Yan1, CHANG Yuan2, WANG Can3   

  1. 1.State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;
    2.School of Management Science and Engineering, Central University of Finance and Economics, Beijing 100081, China;
    3.School of Environment, Tsinghua University, Beijing 100084, China
  • Received:2017-10-27 Online:2018-11-20 Published:2018-11-20
  • Supported by:
    National Key R ɭ Program of China, No. 2017YFC0505703; Funds for International Cooperation and Exchanges of the National Natural Science Foundation of China, No. 51661125010; Joint Fund Project of State Key Laboratory of Water Environment Simulation

Abstract: Food metabolism is one of the basic processes of urban metabolism. Continuously growing urban population drives sharply increasing food demand with related impacts. Aimed at providing adequate information about dynamic process of urban food metabolism and related environmental footprint to identify measures for future diet optimization and impact reduction, this study systematically analyzed the dynamic characteristics of urban food metabolism on metabolic flux, structure and efficiency during 1978-2015 based on a case study of Beijing. Life cycle assessment (LCA) approach was used to calculate water-carbon footprint caused by food consumption, and an eco-efficiency index E was constructed to evaluate the efficiency of food metabolism in Beijing. At last, this study explored several effective ways to optimize urban food metabolism. The results indicated that: 1) In 2015, the urban food metabolic flux was 881.4×104 t in Beijing, which increased 3.3 times compared with the one in 1978, while water footprint and carbon footprint increased 6.1 times and 4.4 times respectively. 2) The structure of both metabolic flux and environmental footprint presented the evolution characteristics of shifting from staple food as main food to non-staple food as main food and from plant-derived food dominated diet to diet with equal importance of plant-derived food and animal-derived food. 3) The over-consumption diets, especially high proportion of meat consumption, not only affected the health status of urban inhabitants in Beijing, but also pushed tempestuously per capita environmental footprint of urban inhabitants into a high level, resulting in the eco-efficiency’s decreasing from 1.27 to 0.32. 4) Alleviating the environmental footprint impacts of urban food metabolism should be based on the following aspects: optimizing the industrial supply chain; sparkplugging healthy diet habits and sustainable consumption patterns.

Key words: environmental footprint, food metabolism, resource loading, urban metabolism

CLC Number: 

  • X24