Changes of urban nitrogen metabolism in the Beijing megacity of China, 2000-2016

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Changes of urban nitrogen metabolism in the Beijing megacity of China, 2000-2016
	Pan, Jingjin ; Ding, Ning ; Yang, Jianxin
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2019-05-20
卷号	666 页码:1048-1057
关键词	Urban expansion Nitrogen flow Coupled human-natural model Industrial production Agricultural production Household consumption
ISSN号	0048-9697
英文摘要	Rapid growth in metropolitan areas is associated with high nitrogen (N) flows and subsequent environmental and human health consequences. Many studies on the contemporary aspects of urban N metabolism have conducted in recent years, but comprehensive analysis from life cycle perspective is limited. In this study, a detailed quantitative framework for a coupled human-natural N flow model, comprising a full cycle analysis based on the substance flow analysis approach to cover and integrate all specific N flows and stocks associated with N production, consumption and emission, was developed to study the temporal changing patterns of N metabolism in Beijing megacity during 2000-2016. The results show that oLil N inputs continuously increased from 413.3 to 529.5 Gg N during the study period, primarily attributing to fossil fuel combustion (53%), fertilizer/feed import (19%), and food import (15%). Agriculture subsystem contains the largest N internal flows, and a decreasing trend is exhibited by a widening gap between local production and household consumption, reflecting Beijing's increasing dependence on the external environment. Moreover, N outputs (394.9 Gg in 2016) contribute to upstream air emissions, landfills accumulation and downstream wastewater discharges. Furthermore, driving force analysis demonstrates that population growth has the largest positive effect on N inputs, and a decoupling of N input with GDP growth is identified. Overall, N flows exhibit an inefficient and unsustainable trend, and possible options for optimizing more sustainable situations while simultaneously minimizing negative consequences are discussed. This study provides decision-makers with an integrated view of N management at the city scale. (C) 2019 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42702]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 2.Chinese Acad Sci, State Key Lab Urban & Reg Ecol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Pan, Jingjin,Ding, Ning,Yang, Jianxin. Changes of urban nitrogen metabolism in the Beijing megacity of China, 2000-2016[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,666:1048-1057.
APA	Pan, Jingjin,Ding, Ning,&Yang, Jianxin.(2019).Changes of urban nitrogen metabolism in the Beijing megacity of China, 2000-2016.SCIENCE OF THE TOTAL ENVIRONMENT,666,1048-1057.
MLA	Pan, Jingjin,et al."Changes of urban nitrogen metabolism in the Beijing megacity of China, 2000-2016".SCIENCE OF THE TOTAL ENVIRONMENT 666(2019):1048-1057.