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Estimation of nitrous oxide, nitric oxide and ammonia emissions from croplands in East, Southeast and South Asia by XIAOYUAN YAN; HAJIME AKIMOTO; TOSHIMASA OHARA is a Environmental Science article available to read on EtoBox.

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## Abstract Agricultural activities have greatly altered the global nitrogen (N) cycle and produced nitrogenous gases of environmental significance. More than half of all chemical N fertilizer produced globally is used in crop production in East, Southeast and South Asia, where rice is central to nutrition. Emissions of nitrous oxide (N~2~O), nitric oxide (NO) and ammonia (NH~3~) from croplands in this region were estimated by considering background emission and emissions resulting from N added to croplands, including chemical N, animal manure, biologically fixed N and N in crop residues returned to fields. Background emission fluxes of N~2~O and NO from croplands were estimated to be 1.22 and 0.57 kg N ha^−1^ yr^−1^, respectively. Separate fertilizer‐induced emission factors were estimated for upland fields and rice fields. Total N~2~O emission from croplands in the study region was estimated to be 1.19 Tg N yr^−1^, with 43% contributed by background emissions. The average fertilizer‐induced N~2~O emission, however, accounts for only 0.93% of the applied N, which is less than the default IPCC value of 1.25%, because of the low emission factor from paddy fields. Total NO emission w

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Author

XIAOYUAN YAN; HAJIME AKIMOTO; TOSHIMASA OHARA

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; Research Square (ISSN 1354-1013)

Published

2003

Language

EN

Field

Environmental Science (Physical Sciences)