Transforming nitrogen management of the urban food system in a food-sink city.

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Date: Nov. 1, 2019
Publisher: Elsevier B.V.
Document Type: Report; Brief article
Length: 379 words

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Abstract :

Keywords Transformation; Nitrogen flow; City strategy; Urban food system; Food-sink city Highlights * Changing nitrogen flows of a food system in a food-sink city are investigated. * Three types of nitrogen loads transfer are identified. * Transforming management priorities in emerging food-sink cities are suggested. * A three-tier framework is proposed to streamline urban mitigation strategies. * The framework could provide a systematic approach to urban nutrient management. Abstract Nitrogen flows in urban food systems are attracting increasing concern. However, characteristics of nitrogen flow and systematic measures to reduce reactive nitrogen losses in the food systems of consumption-oriented cities in developing countries have not been well understood, especially in a quantitative way. This study empirically investigates the transforming nitrogen flows of an urban food system in a food-sink city in China, with a nitrogen metabolism model. Three types of nitrogen loads transfer are identified: from production to consumption side, between different environmental media, and from areas within to areas beyond the city boundary. By integrating sensitivity analysis into the metabolism model, increases in the sewage treatment rate, the sewage nitrogen removal rate, and the ratio of animal excreta returned to field are found to contribute the most to the water nitrogen load reduction, and reducing food waste at the consumer level is the most influential measure for lowering soil nitrogen loads, under the existing nitrogen flow regime. Additionally, a three-tier template framework is proposed to streamline city strategies (prevention, abatement, recycling, regional cooperation, etc.) for reducing the N loads of urban food systems, providing references for sustainable nutrient management in urban ecosystems. Author Affiliation: (a) Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China (b) University of Chinese Academy of Sciences, Beijing, 100049, China (c) Xiamen Key Lab of Urban Metabolism, Xiamen, 361021, China (d) School of Biotechnology Engineering, Jimei University, Xiamen, 361021, China (e) College of Information & Mechanical and Electrical Engineering, Ningde Normal University, Ningde, 352100, China * Corresponding author. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. Article History: Received 15 November 2018; Revised 14 June 2019; Accepted 15 June 2019 Byline: Wei Huang (a,b,c), Bing Gao (a,c), Yunfeng Huang (d), Zhiling Zhang (e), Su Xu (a,c), Lilai Xu (a,c), Shenghui Cui [shcui@iue.ac.cn] (a,c,*)

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Gale Document Number: GALE|A601925105