Document Detail

The nitrogen footprint in China: food, energy and non-food goods.
MedLine Citation:
PMID:  23883136     Owner:  NLM     Status:  Publisher    
The nitrogen (N) footprint is a novel approach to quantify losses to the environment of reactive N (Nr; all species of N except N2) derived from human activities. However, current N footprint models are difficult to apply to new countries due to the large data requirement, and sources of Nr included in calculating the N footprint are often incomplete. In this study, we comprehensively quantified the N footprint in China with an N mass balance approach. Results show that the per capita N footprint in China increased 68% between 1980 and 2008, from 19 to 32 kg N yr-1. The Nr loss from the production and consumption of food was the largest component of the N footprint (70%) while energy and non-food products made up the remainder in approximately equal portion in 2008. In contrast, in 1980 the food-related N footprint accounted for 86% of the overall N footprint, followed by non-food products (8%) and energy (6%). The findings and methods of this study are generally comparable to that of the consumer-based analysis of the N-Calculator. This work provides policy makers quantitative information about the sources of China's N footprint and demonstrates the significant challenges in reducing Nr loss to the environment.
Baojing Gu; Allison Leach; Lin Ma; James N Galloway; Scott X Chang; Ying Ge; Jie Chang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-24
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-7-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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