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AGU: Geophysical Research Letters

 

Index Terms

  • Biogeosciences: Biogeochemical cycles, processes, and modeling
  • Biogeosciences: Trace gases
  • Global Change: Atmosphere
  • Hydrology: Groundwater hydrology
  • Hydrology: Groundwater quality

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L03403, 4 PP., 2005
doi:10.1029/2004GL021625

Evaluation of emission factors for indirect N2O emission due to nitrogen leaching in agro-ecosystems

Takuji Sawamoto

Faculty of Dairy Science, Rakuno Gakuen University, Ebetsu, Japan

Yasuhiro Nakajima

National Institute for Agro-Environmental Sciences, Tsukuba, Japan

Masahiro Kasuya

Aichi-ken Agricultural Research Center, Aichi, Japan

Haruo Tsuruta

National Institute for Agro-Environmental Sciences, Tsukuba, Japan

Kazuyuki Yagi

National Institute for Agro-Environmental Sciences, Tsukuba, Japan

We reviewed the available data of NO3 − and dissolved N2O concentration in leached water in agro-ecosystems from 11 published papers and four unpublished studies, to reevaluate the IPCC default emission factor (N2O-N/NO3 −-N) for indirect N2O emission in agro-ecosystems. The emission factor was estimated to be 0.0024, indicating that the IPCC's present emission factor (0.015) and estimate of indirect N2O emission are too high. Using the estimated value of 0.0024 as the emission factor revises the global indirect N2O emission from N leaching and runoff in agro-ecosystems downward from 1.6 to 0.80 Tg N y−1 and the sum of direct and indirect global N2O emission due to agriculture from 6.3 to 5.5 Tg N y−1.

Received 28 September 2004; accepted 17 January 2005; published 15 February 2005.

Citation: Sawamoto, T., Y. Nakajima, M. Kasuya, H. Tsuruta, and K. Yagi (2005), Evaluation of emission factors for indirect N2O emission due to nitrogen leaching in agro-ecosystems, Geophys. Res. Lett., 32, L03403, doi:10.1029/2004GL021625.

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